Difference between revisions of "Chat"

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Minecraft supports two-way '''chat''' communication via the [[Protocol#Chat Message (clientbound)|Chat Message]] packet, which support a variety of formatting options.  Note that this system isn't exclusive to the Chat Message packet - it's used in several other places (including written books, death messages, window titles, and the like).
+
{{Hatnote|This page previously contained documentation on text formatting features, which can now be found at [[Text formatting]].}}
  
== Current system (JSON Chat) ==
+
This article details various aspects of Minecraft's chat system. The packets themselves are documented in [[Protocol]].
  
Chat data is sent in JSON.  For most situations, the JSON is strictly parsed, but [https://google.github.io/gson/apidocs/com/google/gson/stream/JsonReader.html#setLenient-boolean- lenient JSON parsing] is used for the Disconnect packet and for written book text.
+
== Client chat mode ==
  
=== Inheritance ===
+
The client may use the Chat Mode field of the [[Protocol#Client Information (configuration)|Client Information]] packet to indicate that it only wants to receive some types of chat messages.
  
Each component can have multiple ''siblings''.  Each sibling component inherits properties from the style of its parent, using those styles if they are not defined in the sibling's own style.
+
It is the server's responsibility to not send packets if the client has the given type disabledHowever, it is the client's responsibility to not send incorrect chat packets.
  
For example, in this component:
+
Here's a matrix comparing what packets the server should send to clients based on their chat settings:
  
<syntaxhighlight lang="javascript">
+
{| class="wikitable"
{
+
  !rowspan="2" | Clientbound packet
    "text": "foo",
+
!colspan="3" | Client setting
    "bold": "true",
+
!rowspan="2" | Usage
    "extra": [
 
    {
 
        "text": "bar"
 
    },
 
    {
 
        "text": "baz",
 
        "bold": "false"
 
    },
 
    {
 
        "text": "qux",
 
        "bold": "true"
 
    }]
 
}
 
</syntaxhighlight>
 
 
 
The text "foo", "bar", and "qux" are all rendered as bold while "baz" is not.
 
 
 
=== Schema ===
 
 
 
Each situation where a component can appear may be either a JSON object (the most common choice), an array, or a JSON primitive (which is converted to a String).
 
 
 
JSON primitives can be used for components, in which case they are implicitly converted into a String component.  Note that it is invalid to have a JSON primitive as the root object, so it is '''not''' valid to merely send the text in quotes.  This shorthand is useful for sibling lists, though.
 
 
 
It is also legal to put a JSON array where a component would go, so long as the array is not empty.  The first component in the array is the parent of all of the following components.  This can produce unusual behavior with style inheritance, but it is still useful shorthand.
 
 
 
The most common type of component is a JSON object; the format is as follows:
 
 
 
==== Shared between all components ====
 
 
 
All component types have certain fields that represent the style.  All of these fields may be skipped, in which case the parent's style will be inherited.
 
 
 
;<code>bold</code>
 
:Boolean - if <code>true</code>, the component is emboldened.
 
;<code>italic</code>
 
:Boolean - if <code>true</code>, the component is italicized.
 
;<code>underlined</code>
 
:Boolean - if <code>true</code>, the component is underlined.
 
;<code>strikethrough</code>
 
:Boolean - if <code>true</code>, the component is struck out.
 
;<code>obfuscated</code>
 
:Boolean - if <code>true</code>, the component randomly switches between characters of the same width.
 
;<code>color</code>
 
:String - contains the color for the component.  Should be one of the normal [[#Colors|colors]], but can also be a [[#Styles|format code]] (however, the fields relating to styles should be used instead for that purpose).  If not present (or set to <code>reset</code>), then the default color for the text will be used, which varies by the situation (in some cases, it is white; in others, it is black; in still others, it is a shade of gray that isn't normally used on text).
 
;<code>insertion</code>
 
:String - contains text to insert.  Only used for messages in chat.  When shift is held, clicking the component <em>inserts</em> the given text into the chat box at the cursor (potentially replacing selected text).  Has no effect on other locations at this time.
 
;<code>clickEvent</code>
 
:JSON object - Defines an event that occurs when this component is clicked.  Contains an <code>action</code> key and a <code>value</code> key.  <code>value</code> is internally handled as a String, although it can be any type of JSON primitive.
 
:;<code>open_url</code>
 
::Opens the given URL in the default web browser.  Ignored if the player has opted to disable links in chat; may open a GUI prompting the user if the setting for that is enabled.  The link's protocol must be set and must be <code>http</code> or <code>https</code>, for security reasons.
 
:;<s><code>open_file</code></s>
 
::<strong>Cannot be used within JSON chat</strong>.  Opens a link to any protocol, but cannot be used in JSON chat for security reasons.  Only exists to internally implement links for screenshots.
 
:;<code>run_command</code>
 
::Runs the given command.  Not required to be a command - clicking this only causes the client to send the given content as a chat message, so if not prefixed with <code>/</code>, they will say the given text instead.  If used in a book GUI, the GUI is closed after clicking.
 
:;<s><code>twitch_user_info</code></s>
 
::<strong>No longer supported; cannot be used within JSON chat</strong>.  Only usable in 1.8 and below; twitch support was removed in 1.9.  Additionally, this is only used internally by the client.  On click, opens a twitch user info GUI screen.  Value should be the twitch user name.
 
:;<code>suggest_command</code>
 
::Only usable for messages in chat.  Replaces the content of the chat box with the given text - usually a command, but it is not required to be a command (commands should be prefixed with <code>/</code>).
 
:;<code>change_page</code>
 
::Only usable within written books.  Changes the page of the book to the given page, starting at 1.  For instance, <code>"value":1</code> switches the book to the first page.  If the page is less than one or beyond the number of pages in the book, the event is ignored.
 
;<code>hoverEvent</code>
 
:JSON object - Defines an event that occurs when this component hovered over.  Contains an <code>action</code> key and a <code>value</code> key; action is a String and value is a text component.  However, since text components can be serialized as primitives as well as arrays and objects, this can directly be a String.  A list of actions:
 
:;<code>show_text</code>
 
::The text to display.  Can either be a string directly (<code>"value":"la"</code>) or a full component (<code>"value":{"text":"la","color":"red"}</code>).
 
:;<code>show_item</code>
 
::The NBT of the item to display, in the JSON-NBT format (as would be used in <code>/give</code>).  Note that this is a String and not a JSON object - it should either be set in a String directly (<code>"value":"{id:35,Damage:5,Count:2,tag:{display:{Name:Testing}}}"</code>) or as text of a component (<code>"value":{"text":"{id:35,Damage:5,Count:2,tag:{display:{Name:Testing}}}"}</code>).  If the item is invalid, "Invalid Item!" will be drawn in red instead.
 
:;<code>show_entity</code>
 
::A JSON-NBT String describing the entity.  Contains 3 values: <code>id</code>, the entity's UUID (with dashes); <code>type</code> (optional), which contains the resource location for the entity's type (eg <code>minecraft:zombie</code>); and <code>name</code>, which contains the entity's custom name (if present).  Note that this is a String and not a JSON object.  It should be set in a String directly (<code>"value":"{id:7e4a61cc-83fa-4441-a299-bf69786e610a,type:minecraft:zombie,name:Zombie}"</code>) or as the content of a component.  If the entity is invalid, "Invalid Entity!" will be displayed.  Note that the client does ''not'' need to have the given entity loaded.
 
:;<code>show_achievement</code>
 
::The ID of an achievement or statistic to display.  Example: <code>"value":"achievement.openInventory"</code>.
 
;<code>extra</code>
 
:An array of sibling components.  If present, cannot be empty.
 
 
 
Beyond that, there are additional properties.  Attempt to parse as each of the following in the order they are described:
 
 
 
==== String component ====
 
 
 
A String component contains only text.  If the JSON contains a <code>text</code> key, then the component is a String component.  The only content of this component is its text, with no additional processing.
 
 
 
==== Translation component ====
 
 
 
{{Need Info|Is using this with an invalid key intended or deprecated?  Also, what exactly happens on invalid formats?}}
 
 
 
Translates text into the current language.  If the JSON contains a <code>translate</code> key, then the component is a translation component.
 
 
 
Translation supports <code>%s</code> and <code>%%</code> format tokens.  <code>%%</code> is just an escaped percent symbol.  <code>%s</code> marks text to replace using content from the optional <code>with</code> tag.  <code>with</code> is an array of components.
 
 
 
==== Score component ====
 
 
 
Displays a score.  If the JSON contains a <code>score</code> key, then the component is a score component.
 
 
 
The <code>score</code> JSON object contains data about the objective.
 
 
 
When being sent to the client, it must contain <code>name</code>, <code>objective</code>, and <code>value</code> keys.  <code>name</code> is a player username or entity UUID (if it is a player, it is a username); <code>objective</code> is the name of the objective; <code>value</code> is the resolved value of that objective.
 
 
 
When being sent to the server, <code>value</code> is not used.  <code>name</code> can be an entity selector (that selects one entity), or alternatively <code>*</code> which matches the sending player.
 
 
 
==== Selector component ====
 
 
 
Displays the results of an entity selector.  '''Should not be sent to clients'''; only intended for commands and client-to-server actions.  If the component contains a <code>selector</code> key, then it is a selector component.
 
 
 
The server resolves the list selector into a list of entities, each with an appropriate hover event, and joined with commas and "and" (but it lacks a [[wikipedia:serial comma|serial comma]].
 
 
 
=== Examples ===
 
 
 
Here are some examples from the Notchain server for how chat formatting can be used.
 
 
 
TODO - additional examples
 
 
 
==== Standard chat message ====
 
 
 
The normal chat message uses a translation component along with some styling.
 
 
 
<syntaxhighlight lang="javascript">
 
{"translate":"chat.type.text","with":[{"text":"Herobrine","clickEvent":{"action":"suggest_command","value":"/msg Herobrine "},"hoverEvent":{"action":"show_entity","value":"{id:f84c6a79-0a4e-45e0-879b-cd49ebd4c4e2,name:Herobrine}"},"insertion":"Herobrine"},{"text":"I don't exist"}]}
 
</syntaxhighlight>
 
 
 
The <code>chat.type.text</code> translation key becomes <code><nowiki><%s> %s</nowiki></code>, which is then filled in with the player's name and the actual message.  Note that the player's name has a click event (which inserts text to message the player), a hover event (which shows the entity ID; also note that <code>type</code> is missing), and an insertion (for the player's name).
 
 
 
== Old system ==
 
 
 
=== Control Sequences ===
 
 
 
The client treats certain two-character sequences specially. The first character must be:
 
 
 
*§ (U+00A7) for minecraft
 
*& for minecraft classic
 
 
 
The following character indicates a certain color or formatting to apply to the proceeding text.
 
 
 
The Notchian classic client expects that an escape code in a chat message will be followed by at least one character, and will otherwise crash with a StringIndexOutOfBoundsException. The workaround for servers is to never end a message with a color control character.  This is not an issue for the modern Notchian client.
 
 
 
==== Colors ====
 
 
 
These correspond very roughly to the colors available in ANSI terminals.
 
 
 
e.g.: <code>This is white, but §4this is dark red</code>
 
 
 
[[File:Colors.png|thumb|Hex digit to color mapping]]
 
 
 
{| class="wikitable" style="text-align:center;" border="1" cellpadding="5"
 
|-
 
! colspan="1" width="8px"| Sample
 
! colspan="1" | Code
 
! colspan="1" | Common Name
 
! colspan="1" | Name
 
! colspan="4" | Foreground Color
 
! colspan="4" | Background Color
 
|-
 
| colspan="4" |
 
|width="30px"|R
 
|width="30px"|G
 
|width="30px"|B
 
| Hex
 
|width="30px"|R
 
|width="30px"|G
 
|width="30px"|B
 
| Hex
 
|-
 
{{/ColorSample|000000|000000}}
 
| 0 || Black || <code>black</code> || 0 || 0 || 0 || #000000 || 0 || 0 || 0 || #000000
 
|-
 
{{/ColorSample|0000aa|00002a}}
 
| 1 || Dark blue || <code>dark_blue</code> || 0 || 0 || 170 || #0000aa || 0 || 0 || 42 || #00002a
 
|-
 
{{/ColorSample|00aa00|002a00}}
 
| 2 || Dark green || <code>dark_green</code> || 0 || 170 || 0 || #00aa00 || 0 || 42 || 0 || #002a00
 
|-
 
{{/ColorSample|00aaaa|002a2a}}
 
| 3 || Dark cyan || <code>dark_aqua</code> || 0  || 170 || 170 || #00aaaa || 0 || 42 || 42 || #002a2a
 
|-
 
{{/ColorSample|aa0000|2a0000}}
 
| 4 || Dark red || <code>dark_red</code> || 170 || 0 || 0 || #aa0000 || 42 || 0 || 0 || #2a0000
 
|-
 
{{/ColorSample|aa00aa|2a002a}}
 
| 5 || Purple || <code>dark_purple</code> || 170 || 0 || 170 || #aa00aa || 42 || 0 || 42 || #2a002a
 
|-
 
{{/ColorSample|ffaa00|2a2a00}}
 
| 6 || Gold || <code>gold</code> || 255 || 170 || 0 || #ffaa00 || 42 || 42 || 0 || #2a2a00
 
|-
 
{{/ColorSample|aaaaaa|2a2a2a}}
 
| 7 || Gray || <code>gray</code> || 170 || 170 || 170 || #aaaaaa || 42 || 42 || 42 || #2a2a2a
 
|-
 
{{/ColorSample|555555|151515}}
 
| 8 || Dark gray || <code>dark_gray</code> || 85 || 85 || 85 || #555555 || 21 || 21 || 21 || #151515
 
|-
 
{{/ColorSample|5555ff|15153f}}
 
| 9 || Blue || <code>blue</code> || 85 || 85 || 255 || #5555ff || 21 || 21 || 63 || #15153f
 
|-
 
{{/ColorSample|55ff55|153f15}}
 
| a || Bright green || <code>green</code> || 85 || 255 || 85 || #55ff55 || 21 || 63 || 21 || #153f15
 
|-
 
{{/ColorSample|55ffff|153f3f}}
 
| b || Cyan || <code>aqua</code> || 85 || 255 || 255 || #55ffff || 21 || 63 || 63 || #153f3f
 
|-
 
{{/ColorSample|ff5555|3f1515}}
 
| c || Red || <code>red</code> || 255 || 85 || 85 || #ff5555 || 63 || 21 || 21 || #3f1515
 
|-
 
{{/ColorSample|ff55ff|3f153f}}
 
| d || Pink || <code>light_purple</code> || 255 || 85 || 255 || #ff55ff || 63 || 21 || 63 || #3f153f
 
|-
 
{{/ColorSample|ffff55|3f3f15}}
 
| e || Yellow || <code>yellow</code> || 255 || 255 || 85 || #ffff55 || 63 || 63 || 21 || #3f3f15
 
|-
 
{{/ColorSample|ffffff|3f3f3f}}
 
| f || White || <code>white</code> || 255 || 255 || 255 || #ffffff || 63 || 63 || 63 || #3f3f3f
 
|}
 
 
 
==== Styles ====
 
 
 
Like the color codes above, style escape codes are created by combining § (U+00A7) with one of the following characters. Style codes can be combined (except for "r") to enable multiple effects at once. Using any color codes will reset the current style back to plain (unknown if this is a bug or intended behavior). The "r" plain style code will also reset the current chat color back to white (may also be a bug). The "k" random style code is used for the "§kFUNKY LOL" message in /title/splashes.txt inside minecraft.jar.
 
 
 
{| class="wikitable" style="text-align:center;" border="1" cellpadding="5"
 
|-
 
! colspan="1" | Sample
 
! colspan="1" | Code
 
! colspan="1" | Style
 
! colspan="1" | Name
 
|-
 
| [[File:random_chat.gif]] || k || Random || <code>obfuscated</code>
 
|-
 
| [[File:bold_chat.png]] || l || Bold || <code>bold</code>
 
|-
 
| [[File:strikethrough_chat.png]] || m || Strikethrough || <code>strikethrough</code>
 
|-
 
| [[File:underlined_chat.png]] || n || Underlined || <code>underline</code>
 
|-
 
| [[File:italic_chat.png]] || o || Italic || <code>italic</code>
 
|-
 
| [[File:plain_chat.png]] || r || Plain White || <code>reset</code>
 
|}
 
 
 
== Font ==
 
 
 
Minecraft has two fonts types that can be encountered normally: Ascii (<code>ascii.png</code>) and Unicode (<code>unicode_page_XX.png</code>).  The ascii font will fall back upon unicode characters if they are not provided (see below).  However, use of the Unicode font can be forced for all characters in the language menu.
 
 
 
There is no glyph for the space character.  However, the space character has a width of 4.
 
 
 
Additionally, Minecraft has a [[Wikipedia:Standard Galactic Alphabet|Standard Galactic Alphabet]] font (<code>ascii_sga.png</code>).  This cannot be used in chat, but works much the same as the normal Ascii font in terms of width.  The SGA font only supports lowercase and uppercase letters (the rest of the glyphs are blank), and has the same indexing as the normal ascii font.
 
 
 
The Minecraft client calculates the widths of the default font when the texture is loaded, whilst the sizes of the unicode type are provided in <code>glyph_sizes.bin</code>. Each byte in <code>glyph_sizes.bin</code> contains the start and end position of each character, the top nibble (0xF0) is the start position and the bottom nibble (0x0F) is the end position (relative to the character's position in the font sheet).  Example: https://gist.github.com/TkTech/dff9bbe54c9a074612e1
 
 
 
<div class="mw-collapsible mw-collapsed" style="width: 41em">
 
The Ascii font supports these characters, with the given indexes in <code>ascii.png</code>:
 
 
 
{|class="mw-collapsible-content wikitable"
 
! Codepoint !! Char !! index !! x !! y !! width
 
 
  |-
 
  |-
  | <code>\u00c0</code> || <code>À</code> || 0 || 0 || 0 || 6
+
  ! Full
 +
! Commands only
 +
! Hidden
 
  |-
 
  |-
  | <code>\u00c1</code> || <code>Á</code> || 1 || 1 || 0 || 6
+
  | [[Protocol#Player Chat Message|Player Chat Message]]
 +
| {{yes|✔}}
 +
| {{no|✘}}
 +
| {{no|✘}}
 +
| Player-initiated chat messages, including the commands <code>/say</code>, <code>/me</code>, <code>/msg</code>, <code>/tell</code>, <code>/w</code> and <code>/teammsg</code>.
 
  |-
 
  |-
  | <code>\u00c2</code> || <code>Â</code> || 2 || 2 || 0 || 6
+
  | [[Protocol#Disguised Chat Message|Disguised Chat Message]]
 +
| {{yes|✔}}
 +
| {{no|✘}}
 +
| {{no|✘}}
 +
| Messages sent by non-players using the commands <code>/say</code>, <code>/me</code>, <code>/msg</code>, <code>/tell</code>, <code>/w</code> and <code>/teammsg</code>.
 
  |-
 
  |-
  | <code>\u00c8</code> || <code>È</code> || 3 || 3 || 0 || 6
+
  | [[Protocol#System Chat Message|System Chat Message]]
 +
| {{yes|✔}}
 +
| {{yes|✔}}
 +
| {{no|✘}}
 +
| Feedback from running a command, such as "Your game mode has been updated to creative."
 
  |-
 
  |-
  | <code>\u00ca</code> || <code>Ê</code> || 4 || 4 || 0 || 6
+
  | [[Protocol#System Chat Message|System Chat Message]] (overlay)
  |-
+
  | {{yes|✔}}
| <code>\u00cb</code> || <code>Ë</code> || 5 || 5 || 0 || 6
+
  | {{yes|✔}}
  |-
+
  | {{yes|✔}}
| <code>\u00cd</code> || <code>Í</code> || 6 || 6 || 0 || 4
+
  | Game state information that is displayed above the hot bar, such as "You may not rest now, the bed is too far away".
  |-
+
  |}
| <code>\u00d3</code> || <code>Ó</code> || 7 || 7 || 0 || 6
+
 
  |-
+
Here's a matrix comparing what the client may send based on its chat setting:
| <code>\u00d4</code> || <code>Ô</code> || 8 || 8 || 0 || 6
+
 
|-
+
{| class="wikitable"
| <code>\u00d5</code> || <code>Õ</code> || 9 || 9 || 0 || 6
+
  !rowspan="2" | Serverbound packet
|-
+
  !colspan="3" | Client setting
| <code>\u00da</code> || <code>Ú</code> || 10 || 10 || 0 || 6
 
|-
 
| <code>\u00df</code> || <code>ß</code> || 11 || 11 || 0 || 6
 
|-
 
| <code>\u00e3</code> || <code>ã</code> || 12 || 12 || 0 || 6
 
|-
 
| <code>\u00f5</code> || <code>õ</code> || 13 || 13 || 0 || 6
 
|-
 
| <code>\u011f</code> || <code>ğ</code> || 14 || 14 || 0 || 6
 
|-
 
| <code>\u0130</code> || <code>İ</code> || 15 || 15 || 0 || 4
 
|-
 
| <code>\u0131</code> || <code>ı</code> || 16 || 0 || 1 || 4
 
|-
 
| <code>\u0152</code> || <code>Œ</code> || 17 || 1 || 1 || 6
 
|-
 
| <code>\u0153</code> || <code>œ</code> || 18 || 2 || 1 || 7
 
|-
 
| <code>\u015e</code> || <code>Ş</code> || 19 || 3 || 1 || 6
 
|-
 
| <code>\u015f</code> || <code>ş</code> || 20 || 4 || 1 || 6
 
|-
 
| <code>\u0174</code> || <code>Ŵ</code> || 21 || 5 || 1 || 6
 
|-
 
| <code>\u0175</code> || <code>ŵ</code> || 22 || 6 || 1 || 6
 
|-
 
| <code>\u017e</code> || <code>ž</code> || 23 || 7 || 1 || 6
 
|-
 
| <code>\u0207</code> || <code>ȇ</code> || 24 || 8 || 1 || 6
 
|-
 
| <code>\u0000</code> || <ref group="note" name="zero" /> || 25 || 9 || 1 || -
 
  |-
 
| <code>\u0000</code> || <ref group="note" name="zero" /> || 26 || 10 || 1 || -
 
|-
 
| <code>\u0000</code> || <ref group="note" name="zero" /> || 27 || 11 || 1 || -
 
|-
 
| <code>\u0000</code> || <ref group="note" name="zero" /> || 28 || 12 || 1 || -
 
  |-
 
| <code>\u0000</code> || <ref group="note" name="zero" /> || 29 || 13 || 1 || -
 
|-
 
| <code>\u0000</code> || <ref group="note" name="zero" /> || 30 || 14 || 1 || -
 
|-
 
| <code>\u0000</code> || <ref group="note" name="zero" /> || 31 || 15 || 1 || -
 
|-
 
| <code>\u0020</code> || <code> </code> || 32 || 0 || 2 || 4<ref group="note" name="space" />
 
|-
 
  | <code>\u0021</code> || <code>!</code> || 33 || 1 || 2 || 2
 
|-
 
| <code>\u0022</code> || <code>"</code> || 34 || 2 || 2 || 5
 
|-
 
| <code>\u0023</code> || <code>#</code> || 35 || 3 || 2 || 6
 
|-
 
| <code>\u0024</code> || <code>$</code> || 36 || 4 || 2 || 6
 
|-
 
| <code>\u0025</code> || <code>%</code> || 37 || 5 || 2 || 6
 
|-
 
| <code>\u0026</code> || <code>&</code> || 38 || 6 || 2 || 6
 
|-
 
| <code>\u0027</code> || <code>'</code> || 39 || 7 || 2 || 3
 
|-
 
| <code>\u0028</code> || <code>(</code> || 40 || 8 || 2 || 5
 
|-
 
| <code>\u0029</code> || <code>)</code> || 41 || 9 || 2 || 5
 
|-
 
| <code>\u002a</code> || <code>*</code> || 42 || 10 || 2 || 5
 
|-
 
| <code>\u002b</code> || <code>+</code> || 43 || 11 || 2 || 6
 
|-
 
| <code>\u002c</code> || <code>,</code> || 44 || 12 || 2 || 2
 
|-
 
| <code>\u002d</code> || <code>-</code> || 45 || 13 || 2 || 6
 
|-
 
| <code>\u002e</code> || <code>.</code> || 46 || 14 || 2 || 2
 
|-
 
| <code>\u002f</code> || <code>/</code> || 47 || 15 || 2 || 6
 
|-
 
| <code>\u0030</code> || <code>0</code> || 48 || 0 || 3 || 6
 
|-
 
| <code>\u0031</code> || <code>1</code> || 49 || 1 || 3 || 6
 
|-
 
| <code>\u0032</code> || <code>2</code> || 50 || 2 || 3 || 6
 
|-
 
| <code>\u0033</code> || <code>3</code> || 51 || 3 || 3 || 6
 
|-
 
| <code>\u0034</code> || <code>4</code> || 52 || 4 || 3 || 6
 
|-
 
| <code>\u0035</code> || <code>5</code> || 53 || 5 || 3 || 6
 
|-
 
| <code>\u0036</code> || <code>6</code> || 54 || 6 || 3 || 6
 
|-
 
| <code>\u0037</code> || <code>7</code> || 55 || 7 || 3 || 6
 
|-
 
| <code>\u0038</code> || <code>8</code> || 56 || 8 || 3 || 6
 
|-
 
| <code>\u0039</code> || <code>9</code> || 57 || 9 || 3 || 6
 
|-
 
| <code>\u003a</code> || <code>:</code> || 58 || 10 || 3 || 2
 
|-
 
| <code>\u003b</code> || <code>;</code> || 59 || 11 || 3 || 2
 
|-
 
| <code>\u003c</code> || <code><</code> || 60 || 12 || 3 || 5
 
|-
 
| <code>\u003d</code> || <code>=</code> || 61 || 13 || 3 || 6
 
|-
 
| <code>\u003e</code> || <code>></code> || 62 || 14 || 3 || 5
 
|-
 
| <code>\u003f</code> || <code>?</code> || 63 || 15 || 3 || 6
 
|-
 
| <code>\u0040</code> || <code>@</code> || 64 || 0 || 4 || 7
 
|-
 
| <code>\u0041</code> || <code>A</code> || 65 || 1 || 4 || 6
 
|-
 
| <code>\u0042</code> || <code>B</code> || 66 || 2 || 4 || 6
 
|-
 
| <code>\u0043</code> || <code>C</code> || 67 || 3 || 4 || 6
 
|-
 
| <code>\u0044</code> || <code>D</code> || 68 || 4 || 4 || 6
 
|-
 
| <code>\u0045</code> || <code>E</code> || 69 || 5 || 4 || 6
 
|-
 
| <code>\u0046</code> || <code>F</code> || 70 || 6 || 4 || 6
 
|-
 
| <code>\u0047</code> || <code>G</code> || 71 || 7 || 4 || 6
 
|-
 
| <code>\u0048</code> || <code>H</code> || 72 || 8 || 4 || 6
 
|-
 
| <code>\u0049</code> || <code>I</code> || 73 || 9 || 4 || 4
 
|-
 
| <code>\u004a</code> || <code>J</code> || 74 || 10 || 4 || 6
 
|-
 
| <code>\u004b</code> || <code>K</code> || 75 || 11 || 4 || 6
 
|-
 
| <code>\u004c</code> || <code>L</code> || 76 || 12 || 4 || 6
 
|-
 
| <code>\u004d</code> || <code>M</code> || 77 || 13 || 4 || 6
 
|-
 
| <code>\u004e</code> || <code>N</code> || 78 || 14 || 4 || 6
 
|-
 
| <code>\u004f</code> || <code>O</code> || 79 || 15 || 4 || 6
 
|-
 
| <code>\u0050</code> || <code>P</code> || 80 || 0 || 5 || 6
 
|-
 
| <code>\u0051</code> || <code>Q</code> || 81 || 1 || 5 || 6
 
|-
 
| <code>\u0052</code> || <code>R</code> || 82 || 2 || 5 || 6
 
|-
 
| <code>\u0053</code> || <code>S</code> || 83 || 3 || 5 || 6
 
|-
 
| <code>\u0054</code> || <code>T</code> || 84 || 4 || 5 || 6
 
|-
 
| <code>\u0055</code> || <code>U</code> || 85 || 5 || 5 || 6
 
|-
 
| <code>\u0056</code> || <code>V</code> || 86 || 6 || 5 || 6
 
|-
 
| <code>\u0057</code> || <code>W</code> || 87 || 7 || 5 || 6
 
|-
 
| <code>\u0058</code> || <code>X</code> || 88 || 8 || 5 || 6
 
|-
 
| <code>\u0059</code> || <code>Y</code> || 89 || 9 || 5 || 6
 
|-
 
| <code>\u005a</code> || <code>Z</code> || 90 || 10 || 5 || 6
 
|-
 
| <code>\u005b</code> || <code>[</code> || 91 || 11 || 5 || 4
 
|-
 
| <code>\u005c</code> || <code>\</code> || 92 || 12 || 5 || 6
 
|-
 
| <code>\u005d</code> || <code>]</code> || 93 || 13 || 5 || 4
 
|-
 
| <code>\u005e</code> || <code>^</code> || 94 || 14 || 5 || 6
 
|-
 
| <code>\u005f</code> || <code>_</code> || 95 || 15 || 5 || 6
 
|-
 
| <code>\u0060</code> || <code>`</code> || 96 || 0 || 6 || 3
 
|-
 
| <code>\u0061</code> || <code>a</code> || 97 || 1 || 6 || 6
 
|-
 
| <code>\u0062</code> || <code>b</code> || 98 || 2 || 6 || 6
 
|-
 
| <code>\u0063</code> || <code>c</code> || 99 || 3 || 6 || 6
 
|-
 
| <code>\u0064</code> || <code>d</code> || 100 || 4 || 6 || 6
 
|-
 
| <code>\u0065</code> || <code>e</code> || 101 || 5 || 6 || 6
 
|-
 
| <code>\u0066</code> || <code>f</code> || 102 || 6 || 6 || 5
 
|-
 
| <code>\u0067</code> || <code>g</code> || 103 || 7 || 6 || 6
 
|-
 
| <code>\u0068</code> || <code>h</code> || 104 || 8 || 6 || 6
 
|-
 
| <code>\u0069</code> || <code>i</code> || 105 || 9 || 6 || 2
 
|-
 
| <code>\u006a</code> || <code>j</code> || 106 || 10 || 6 || 6
 
|-
 
| <code>\u006b</code> || <code>k</code> || 107 || 11 || 6 || 5
 
|-
 
| <code>\u006c</code> || <code>l</code> || 108 || 12 || 6 || 3
 
|-
 
| <code>\u006d</code> || <code>m</code> || 109 || 13 || 6 || 6
 
|-
 
| <code>\u006e</code> || <code>n</code> || 110 || 14 || 6 || 6
 
|-
 
| <code>\u006f</code> || <code>o</code> || 111 || 15 || 6 || 6
 
|-
 
| <code>\u0070</code> || <code>p</code> || 112 || 0 || 7 || 6
 
|-
 
| <code>\u0071</code> || <code>q</code> || 113 || 1 || 7 || 6
 
|-
 
| <code>\u0072</code> || <code>r</code> || 114 || 2 || 7 || 6
 
|-
 
| <code>\u0073</code> || <code>s</code> || 115 || 3 || 7 || 6
 
|-
 
| <code>\u0074</code> || <code>t</code> || 116 || 4 || 7 || 4
 
|-
 
| <code>\u0075</code> || <code>u</code> || 117 || 5 || 7 || 6
 
|-
 
| <code>\u0076</code> || <code>v</code> || 118 || 6 || 7 || 6
 
|-
 
| <code>\u0077</code> || <code>w</code> || 119 || 7 || 7 || 6
 
|-
 
| <code>\u0078</code> || <code>x</code> || 120 || 8 || 7 || 6
 
|-
 
| <code>\u0079</code> || <code>y</code> || 121 || 9 || 7 || 6
 
|-
 
| <code>\u007a</code> || <code>z</code> || 122 || 10 || 7 || 6
 
|-
 
| <code>\u007b</code> || <code>{</code> || 123 || 11 || 7 || 5
 
|-
 
| <code>\u007c</code> || <code>|</code> || 124 || 12 || 7 || 2
 
|-
 
| <code>\u007d</code> || <code>}</code> || 125 || 13 || 7 || 5
 
|-
 
| <code>\u007e</code> || <code>~</code> || 126 || 14 || 7 || 7
 
|-
 
| <code>\u0000</code> || <ref group="note" name="zero" /> || 127 || 15 || 7 || -
 
|-
 
| <code>\u00c7</code> || <code>Ç</code> || 128 || 0 || 8 || 6
 
|-
 
| <code>\u00fc</code> || <code>ü</code> || 129 || 1 || 8 || 6
 
|-
 
| <code>\u00e9</code> || <code>é</code> || 130 || 2 || 8 || 6
 
|-
 
| <code>\u00e2</code> || <code>â</code> || 131 || 3 || 8 || 6
 
|-
 
| <code>\u00e4</code> || <code>ä</code> || 132 || 4 || 8 || 6
 
|-
 
| <code>\u00e0</code> || <code>à</code> || 133 || 5 || 8 || 6
 
|-
 
| <code>\u00e5</code> || <code>å</code> || 134 || 6 || 8 || 6
 
|-
 
| <code>\u00e7</code> || <code>ç</code> || 135 || 7 || 8 || 6
 
|-
 
| <code>\u00ea</code> || <code>ê</code> || 136 || 8 || 8 || 6
 
|-
 
| <code>\u00eb</code> || <code>ë</code> || 137 || 9 || 8 || 6
 
|-
 
| <code>\u00e8</code> || <code>è</code> || 138 || 10 || 8 || 6
 
|-
 
| <code>\u00ef</code> || <code>ï</code> || 139 || 11 || 8 || 4
 
|-
 
| <code>\u00ee</code> || <code>î</code> || 140 || 12 || 8 || 6
 
|-
 
| <code>\u00ec</code> || <code>ì</code> || 141 || 13 || 8 || 3
 
|-
 
| <code>\u00c4</code> || <code>Ä</code> || 142 || 14 || 8 || 6
 
|-
 
| <code>\u00c5</code> || <code>Å</code> || 143 || 15 || 8 || 6
 
|-
 
| <code>\u00c9</code> || <code>É</code> || 144 || 0 || 9 || 6
 
|-
 
| <code>\u00e6</code> || <code>æ</code> || 145 || 1 || 9 || 6
 
|-
 
| <code>\u00c6</code> || <code>Æ</code> || 146 || 2 || 9 || 6
 
|-
 
| <code>\u00f4</code> || <code>ô</code> || 147 || 3 || 9 || 6
 
|-
 
| <code>\u00f6</code> || <code>ö</code> || 148 || 4 || 9 || 6
 
|-
 
| <code>\u00f2</code> || <code>ò</code> || 149 || 5 || 9 || 6
 
|-
 
| <code>\u00fb</code> || <code>û</code> || 150 || 6 || 9 || 6
 
|-
 
| <code>\u00f9</code> || <code>ù</code> || 151 || 7 || 9 || 6
 
|-
 
| <code>\u00ff</code> || <code>ÿ</code> || 152 || 8 || 9 || 6
 
|-
 
| <code>\u00d6</code> || <code>Ö</code> || 153 || 9 || 9 || 6
 
|-
 
| <code>\u00dc</code> || <code>Ü</code> || 154 || 10 || 9 || 6
 
|-
 
| <code>\u00f8</code> || <code>ø</code> || 155 || 11 || 9 || 6
 
|-
 
| <code>\u00a3</code> || <code>£</code> || 156 || 12 || 9 || 6
 
|-
 
| <code>\u00d8</code> || <code>Ø</code> || 157 || 13 || 9 || 6
 
|-
 
| <code>\u00d7</code> || <code>×</code> || 158 || 14 || 9 || 4
 
|-
 
| <code>\u0192</code> || <code>ƒ</code> || 159 || 15 || 9 || 6
 
|-
 
| <code>\u00e1</code> || <code>á</code> || 160 || 0 || 10 || 6
 
|-
 
| <code>\u00ed</code> || <code>í</code> || 161 || 1 || 10 || 3
 
|-
 
| <code>\u00f3</code> || <code>ó</code> || 162 || 2 || 10 || 6
 
|-
 
| <code>\u00fa</code> || <code>ú</code> || 163 || 3 || 10 || 6
 
|-
 
| <code>\u00f1</code> || <code>ñ</code> || 164 || 4 || 10 || 6
 
|-
 
| <code>\u00d1</code> || <code>Ñ</code> || 165 || 5 || 10 || 6
 
|-
 
| <code>\u00aa</code> || <code>ª</code> || 166 || 6 || 10 || 6
 
|-
 
| <code>\u00ba</code> || <code>º</code> || 167 || 7 || 10 || 6
 
|-
 
| <code>\u00bf</code> || <code>¿</code> || 168 || 8 || 10 || 6
 
|-
 
| <code>\u00ae</code> || <code>®</code> || 169 || 9 || 10 || 7
 
|-
 
| <code>\u00ac</code> || <code>¬</code> || 170 || 10 || 10 || 6
 
|-
 
| <code>\u00bd</code> || <code>½</code> || 171 || 11 || 10 || 6
 
|-
 
| <code>\u00bc</code> || <code>¼</code> || 172 || 12 || 10 || 6
 
|-
 
| <code>\u00a1</code> || <code>¡</code> || 173 || 13 || 10 || 2
 
|-
 
| <code>\u00ab</code> || <code>«</code> || 174 || 14 || 10 || 6
 
|-
 
| <code>\u00bb</code> || <code>»</code> || 175 || 15 || 10 || 6
 
|-
 
| <code>\u2591</code> || <code>░</code> || 176 || 0 || 11 || 8
 
|-
 
| <code>\u2592</code> || <code>▒</code> || 177 || 1 || 11 || 9
 
|-
 
| <code>\u2593</code> || <code>▓</code> || 178 || 2 || 11 || 9
 
|-
 
| <code>\u2502</code> || <code>│</code> || 179 || 3 || 11 || 6
 
|-
 
| <code>\u2524</code> || <code>┤</code> || 180 || 4 || 11 || 6
 
|-
 
| <code>\u2561</code> || <code>╡</code> || 181 || 5 || 11 || 6
 
|-
 
| <code>\u2562</code> || <code>╢</code> || 182 || 6 || 11 || 8
 
|-
 
| <code>\u2556</code> || <code>╖</code> || 183 || 7 || 11 || 8
 
|-
 
| <code>\u2555</code> || <code>╕</code> || 184 || 8 || 11 || 6
 
|-
 
| <code>\u2563</code> || <code>╣</code> || 185 || 9 || 11 || 8
 
|-
 
| <code>\u2551</code> || <code>║</code> || 186 || 10 || 11 || 8
 
|-
 
| <code>\u2557</code> || <code>╗</code> || 187 || 11 || 11 || 8
 
|-
 
| <code>\u255d</code> || <code>╝</code> || 188 || 12 || 11 || 8
 
|-
 
| <code>\u255c</code> || <code>╜</code> || 189 || 13 || 11 || 8
 
|-
 
| <code>\u255b</code> || <code>╛</code> || 190 || 14 || 11 || 6
 
|-
 
| <code>\u2510</code> || <code>┐</code> || 191 || 15 || 11 || 6
 
|-
 
| <code>\u2514</code> || <code>└</code> || 192 || 0 || 12 || 9
 
|-
 
| <code>\u2534</code> || <code>┴</code> || 193 || 1 || 12 || 9
 
|-
 
| <code>\u252c</code> || <code>┬</code> || 194 || 2 || 12 || 9
 
|-
 
| <code>\u251c</code> || <code>├</code> || 195 || 3 || 12 || 9
 
|-
 
| <code>\u2500</code> || <code>─</code> || 196 || 4 || 12 || 9
 
 
  |-
 
  |-
  | <code>\u253c</code> || <code>┼</code> || 197 || 5 || 12 || 9
+
  ! Full
 +
! Commands only
 +
! Hidden
 
  |-
 
  |-
  | <code>\u255e</code> || <code></code> || 198 || 6 || 12 || 9
+
  | [[Protocol#Chat Message|Chat Message]]
 +
| {{yes|✔}}
 +
| {{maybe|✘<ref group="note">This behavior varies.  The Notchian server <em>previously</em> rejected chat messages, but now allows them to go through (sending them to all players, but they're invisible on the sender's side).  CraftBukkit and derivatives continue to reject this.  See [https://bugs.mojang.com/browse/MC-116824 MC-116824] for more information.</ref>}}
 +
| {{no|✘}}
 
  |-
 
  |-
  | <code>\u255f</code> || <code>╟</code> || 199 || 7 || 12 || 9
+
  | [[Protocol#Chat Command|Chat Command]]
|-
+
  | {{yes|✔}}
| <code>\u255a</code> || <code>╚</code> || 200 || 8 || 12 || 9
+
  | {{yes|✔}}
|-
+
  | {{no|✘}}
| <code>\u2554</code> || <code>╔</code> || 201 || 9 || 12 || 9
 
|-
 
| <code>\u2569</code> || <code>╩</code> || 202 || 10 || 12 || 9
 
|-
 
| <code>\u2566</code> || <code>╦</code> || 203 || 11 || 12 || 9
 
|-
 
| <code>\u2560</code> || <code>╠</code> || 204 || 12 || 12 || 9
 
|-
 
| <code>\u2550</code> || <code>═</code> || 205 || 13 || 12 || 9
 
|-
 
| <code>\u256c</code> || <code>╬</code> || 206 || 14 || 12 || 9
 
|-
 
| <code>\u2567</code> || <code>╧</code> || 207 || 15 || 12 || 9
 
|-
 
| <code>\u2568</code> || <code>╨</code> || 208 || 0 || 13 || 9
 
|-
 
| <code>\u2564</code> || <code>╤</code> || 209 || 1 || 13 || 9
 
|-
 
| <code>\u2565</code> || <code>╥</code> || 210 || 2 || 13 || 9
 
  |-
 
| <code>\u2559</code> || <code>╙</code> || 211 || 3 || 13 || 9
 
|-
 
  | <code>\u2558</code> || <code>╘</code> || 212 || 4 || 13 || 9
 
|-
 
  | <code>\u2552</code> || <code>╒</code> || 213 || 5 || 13 || 9
 
|-
 
| <code>\u2553</code> || <code>╓</code> || 214 || 6 || 13 || 9
 
|-
 
| <code>\u256b</code> || <code>╫</code> || 215 || 7 || 13 || 9
 
|-
 
| <code>\u256a</code> || <code>╪</code> || 216 || 8 || 13 || 9
 
|-
 
| <code>\u2518</code> || <code>┘</code> || 217 || 9 || 13 || 6
 
|-
 
| <code>\u250c</code> || <code>┌</code> || 218 || 10 || 13 || 9
 
|-
 
| <code>\u2588</code> || <code>█</code> || 219 || 11 || 13 || 9
 
|-
 
| <code>\u2584</code> || <code>▄</code> || 220 || 12 || 13 || 9
 
|-
 
| <code>\u258c</code> || <code>▌</code> || 221 || 13 || 13 || 5
 
|-
 
| <code>\u2590</code> || <code>▐</code> || 222 || 14 || 13 || 9
 
|-
 
| <code>\u2580</code> || <code>▀</code> || 223 || 15 || 13 || 9
 
|-
 
| <code>\u03b1</code> || <code>α</code> || 224 || 0 || 14 || 8
 
|-
 
| <code>\u03b2</code> || <code>β</code> || 225 || 1 || 14 || 7
 
|-
 
| <code>\u0393</code> || <code>Γ</code> || 226 || 2 || 14 || 7
 
|-
 
| <code>\u03c0</code> || <code>π</code> || 227 || 3 || 14 || 8
 
|-
 
| <code>\u03a3</code> || <code>Σ</code> || 228 || 4 || 14 || 7
 
|-
 
| <code>\u03c3</code> || <code>σ</code> || 229 || 5 || 14 || 8
 
|-
 
| <code>\u03bc</code> || <code>μ</code> || 230 || 6 || 14 || 8
 
|-
 
| <code>\u03c4</code> || <code>τ</code> || 231 || 7 || 14 || 8
 
|-
 
| <code>\u03a6</code> || <code>Φ</code> || 232 || 8 || 14 || 7
 
|-
 
| <code>\u0398</code> || <code>Θ</code> || 233 || 9 || 14 || 8
 
|-
 
| <code>\u03a9</code> || <code>Ω</code> || 234 || 10 || 14 || 8
 
|-
 
| <code>\u03b4</code> || <code>δ</code> || 235 || 11 || 14 || 7
 
|-
 
| <code>\u221e</code> || <code>∞</code> || 236 || 12 || 14 || 9
 
|-
 
| <code>\u2205</code> || <code>∅</code> || 237 || 13 || 14 || 9
 
|-
 
| <code>\u2208</code> || <code>∈</code> || 238 || 14 || 14 || 6
 
|-
 
| <code>\u2229</code> || <code>∩</code> || 239 || 15 || 14 || 7
 
|-
 
| <code>\u2261</code> || <code>≡</code> || 240 || 0 || 15 || 7
 
|-
 
| <code>\u00b1</code> || <code>±</code> || 241 || 1 || 15 || 7
 
|-
 
| <code>\u2265</code> || <code>≥</code> || 242 || 2 || 15 || 7
 
|-
 
| <code>\u2264</code> || <code>≤</code> || 243 || 3 || 15 || 7
 
|-
 
| <code>\u2320</code> || <code>⌠</code> || 244 || 4 || 15 || 9
 
|-
 
| <code>\u2321</code> || <code>⌡</code> || 245 || 5 || 15 || 6
 
|-
 
| <code>\u00f7</code> || <code>÷</code> || 246 || 6 || 15 || 7
 
|-
 
| <code>\u2248</code> || <code>≈</code> || 247 || 7 || 15 || 8
 
|-
 
| <code>\u00b0</code> || <code>°</code> || 248 || 8 || 15 || 7
 
|-
 
| <code>\u2219</code> || <code>∙</code> || 249 || 9 || 15 || 6
 
|-
 
| <code>\u00b7</code> || <code>·</code> || 250 || 10 || 15 || 6
 
|-
 
| <code>\u221a</code> || <code>√</code> || 251 || 11 || 15 || 9
 
|-
 
| <code>\u207f</code> || <code>ⁿ</code> || 252 || 12 || 15 || 7
 
|-
 
| <code>\u00b2</code> || <code>²</code> || 253 || 13 || 15 || 6
 
|-
 
| <code>\u25a0</code> || <code>■</code> || 254 || 14 || 15 || 7
 
|-
 
| <code>\u0000</code> || <ref group="note" name="zero" /> || 255 || 15 || 15 || -
 
 
  |}
 
  |}
</div>
 
  
TODO: Expand on shadows/bold/whatever for implementing.
+
If the client attempts to send a chat message and the server rejects it, the Notchian server will send that client a [[Protocol#System Chat Message|System Chat Message]] (non-overlay) with a red <code>chat.disabled.options</code> translation component (which becomes "Chat disabled in client options.").
 +
 
 +
== Social Interactions (blocking) ==
 +
 
 +
1.16 added a ''social interactions screen'' that lets players block chat from other players. Blocking takes place clientside by detecting whether a message is from a blocked player.
 +
 
 +
[[Protocol#Player Chat Message|Player Chat Message]] packets are blocked based on the included sender UUID.
 +
 
 +
[[Protocol#Disguised Chat Message|Disguised Chat Message]] packets are never blocked.
 +
 
 +
[[Protocol#System Chat Message|System Chat Message]] packets (regardless of the Overlay field!) are blocked based on the first occurrence of <code><''playername''></code> anywhere in the message, including split across multiple text components, where ''playername'' may be any text, including the empty string or whitespace. If ''playername'' is the name of a blocked player (matched case-sensitively), the message is blocked. This only occurs if Hide Matched Names is enabled in Chat Settings (the default).
  
 
== Notes ==
 
== Notes ==
  
<references group="note">
+
<references group="note" />
<ref name="zero">This code point isn't supported, and may be replaced with another character in a future version.  <code>\u0000</code> should be directly skipped instead of being rendered with this code point.</ref>
 
<ref name="space">The space character is mapped to an index within <code>ascii.png</code>, but the width is hardcoded to 4 and the character at that position is not rendered.</ref>
 
</references>
 
  
 
[[Category:Protocol Details]]
 
[[Category:Protocol Details]]
 
[[Category:Minecraft Modern]]
 
[[Category:Minecraft Modern]]

Latest revision as of 23:22, 13 March 2024

This page previously contained documentation on text formatting features, which can now be found at Text formatting.

This article details various aspects of Minecraft's chat system. The packets themselves are documented in Protocol.

Client chat mode

The client may use the Chat Mode field of the Client Information packet to indicate that it only wants to receive some types of chat messages.

It is the server's responsibility to not send packets if the client has the given type disabled. However, it is the client's responsibility to not send incorrect chat packets.

Here's a matrix comparing what packets the server should send to clients based on their chat settings:

Clientbound packet Client setting Usage
Full Commands only Hidden
Player Chat Message Player-initiated chat messages, including the commands /say, /me, /msg, /tell, /w and /teammsg.
Disguised Chat Message Messages sent by non-players using the commands /say, /me, /msg, /tell, /w and /teammsg.
System Chat Message Feedback from running a command, such as "Your game mode has been updated to creative."
System Chat Message (overlay) Game state information that is displayed above the hot bar, such as "You may not rest now, the bed is too far away".

Here's a matrix comparing what the client may send based on its chat setting:

Serverbound packet Client setting
Full Commands only Hidden
Chat Message [note 1]
Chat Command

If the client attempts to send a chat message and the server rejects it, the Notchian server will send that client a System Chat Message (non-overlay) with a red chat.disabled.options translation component (which becomes "Chat disabled in client options.").

Social Interactions (blocking)

1.16 added a social interactions screen that lets players block chat from other players. Blocking takes place clientside by detecting whether a message is from a blocked player.

Player Chat Message packets are blocked based on the included sender UUID.

Disguised Chat Message packets are never blocked.

System Chat Message packets (regardless of the Overlay field!) are blocked based on the first occurrence of <playername> anywhere in the message, including split across multiple text components, where playername may be any text, including the empty string or whitespace. If playername is the name of a blocked player (matched case-sensitively), the message is blocked. This only occurs if Hide Matched Names is enabled in Chat Settings (the default).

Notes

  1. This behavior varies. The Notchian server previously rejected chat messages, but now allows them to go through (sending them to all players, but they're invisible on the sender's side). CraftBukkit and derivatives continue to reject this. See MC-116824 for more information.