In Visual Studio Code, each language mode has a unique specific language identifier. That identifier is rarely seen by the user except in the settings, for example, when associating file extensions to a language:
"files.associations": {
"*.myphp": "php"
}
Note that casing matters for exact identifier matching ('Markdown' != 'markdown')
The language identifier becomes essential for VS Code extension developers when adding new language capabilities or when replacing a language support.
Every language defines its id through the languages configuration point in the extension's package.json file:
"languages": [{
"id": "java",
"extensions": [ ".java", ".jav" ],
"aliases": [ "Java", "java" ]
}]
Language supports are added using the language identifier:
"grammars": [{
"language": "groovy",
"scopeName": "source.groovy",
"path": "./syntaxes/Groovy.tmLanguage.json"
}],
"snippets": [{
"language": "groovy",
"path": "./snippets/groovy.json"
}]
languages.registerCompletionItemProvider('php', new PHPCompletionItemProvider(), '.', '$');
When defining a new language identifier, use the following guidelines:
The following table lists known language identifiers:
Language Identifier ABAPabap Windows Bat bat BibTeX bibtex Clojure clojure Coffeescript coffeescript C c C++ cpp C# csharp Compose dockercompose CSS css CUDA C++ cuda-cpp D d Dart dart Delphi pascal Diff diff Dockerfile dockerfile Erlang erlang F# fsharp Git git-commit and git-rebase Go go Groovy groovy Handlebars handlebars Haml haml Haskell haskell HTML html Ini ini Java java JavaScript javascript JavaScript JSX javascriptreact JSON json JSON with Comments jsonc Julia julia LaTeX latex Less less Lua lua Makefile makefile Markdown markdown Objective-C objective-c Objective-C++ objective-cpp OCaml ocaml Pascal pascal Perl perl and perl6 PHP php Plain Text plaintext PowerShell powershell Pug jade, pug Python python R r Razor (cshtml) razor Ruby ruby Rust rust SCSS scss (syntax using curly brackets), sass (indented syntax) ShaderLab shaderlab Shell Script (Bash) shellscript Slim slim SQL sql Stylus stylus Svelte svelte Swift swift TypeScript typescript TypeScript JSX typescriptreact TeX tex Visual Basic vb Vue vue Vue HTML vue-html XML xml XSL xsl YAML yaml
07/09/2025
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