Code highlighting supported languages

Default code highlighting relies on Rouge since Redmine 4.0.0. It supports over 200 languages. Refer RedmineTextFormattingTextile or RedmineTextFormattingMarkdown for how to highlight code.

Here is a list of supported languages by Rouge 3.26.0, which is bundled with Redmine 4.2.0. You can also get a list by running bundle exec rougify list in the installation directory of Redmine.

Language Description
abap SAP - Advanced Business Application Programming
actionscript ActionScript [aliases: as,as3]
ada The Ada 2012 programming language
apache configuration files for Apache web server
apex The Apex programming language (provided by salesforce)
apiblueprint Markdown based API description language. [aliases: apiblueprint,apib]
applescript The AppleScript scripting language by Apple Inc. (http://developer.apple.com/applescript/) [aliases: applescript]
armasm Arm assembly syntax
augeas The Augeas programming language (augeas.net) [aliases: aug]
awk pattern-directed scanning and processing language
batchfile Windows Batch File [aliases: bat,batch,dosbatch,winbatch]
bbcbasic BBC BASIC syntax
bibtex BibTeX [aliases: bib]
biml BIML, Business Intelligence Markup Language
bpf BPF bytecode syntax
brainfuck The Brainfuck programming language
brightscript BrightScript Programming Language (https://developer.roku.com/en-ca/docs/references/brightscript/language/brightscript-language-reference.md) [aliases: bs,brs]
bsl The 1C:Enterprise programming language
c The C programming language
ceylon Say more, more clearly.
cfscript CFScript, the CFML scripting language [aliases: cfc]
clean The Clean programming language (clean.cs.ru.nl)
clojure The Clojure programming language (clojure.org) [aliases: clj,cljs]
cmake The cross-platform, open-source build system
cmhg RISC OS C module header generator source file
coffeescript The Coffeescript programming language (coffeescript.org) [aliases: coffee,coffee-script]
common_lisp The Common Lisp variant of Lisp (common-lisp.net) [aliases: cl,common-lisp,elisp,emacs-lisp,lisp]
conf A generic lexer for configuration files [aliases: config,configuration]
console A generic lexer for shell sessions. Accepts ?lang and ?output lexer options, a ?prompt option, ?comments to enable # comments, and ?error to handle error messages. [aliases: terminal,shell_session,shell-session]
coq Coq (coq.inria.fr)
cpp The C++ programming language [aliases: c++]
crystal Crystal The Programming Language (crystal-lang.org) [aliases: cr]
csharp a multi-paradigm language targeting .NET [aliases: c#,cs]
css Cascading Style Sheets, used to style web pages
csvs The CSV Schema Language (digital-preservation.github.io)
cuda Compute Unified Device Architecture, used for programming with NVIDIA GPU
cypher The Cypher query language (neo4j.com/docs/cypher-manual) [aliases: cypher]
cython Cython and Pyrex source code (cython.org) [aliases: pyx,pyrex]
d The D programming language(dlang.org) [aliases: dlang]
dart The Dart programming language (dartlang.com)
datastudio Datastudio scripting language
diff Lexes unified diffs or patches [aliases: patch,udiff]
digdag A simple, open source, multi-cloud workflow engine (https://www.digdag.io/)
docker Dockerfile syntax [aliases: dockerfile,Dockerfile]
dot graph description language
ecl Enterprise Control Language (hpccsystems.com)
eex Embedded Elixir [aliases: leex]
eiffel Eiffel programming language
elixir Elixir language (elixir-lang.org) [aliases: elixir,exs]
elm The Elm programming language (http://elm-lang.org/)
email An email message [aliases: eml,e-mail]
epp Embedded Puppet template files
erb Embedded ruby template files [aliases: eruby,rhtml]
erlang The Erlang programming language (erlang.org) [aliases: erl]
escape A generic lexer for including escaped content - see Formatter.enable_escape! [aliases: esc]
factor Factor, the practical stack language (factorcode.org)
fortran Fortran 2008 (free-form)
freefem The FreeFEM programming language (freefem.org) [aliases: ff]
fsharp F# (fsharp.net)
gdscript The Godot Engine programming language (https://godotengine.org/) [aliases: gd,gdscript]
ghc-cmm GHC Cmm is the intermediate representation of the GHC Haskell compiler [aliases: cmm]
ghc-core Intermediate representation of the GHC Haskell compiler.
gherkin A business-readable spec DSL (github.com/cucumber/cucumber/wiki/Gherkin) [aliases: cucumber,behat]
glsl The GLSL shader language
go The Go programming language (http://golang.org) [aliases: go,golang]
gradle A powerful build system for the JVM
graphql GraphQL
groovy The Groovy programming language (http://www.groovy-lang.org/)
hack The Hack programming language (hacklang.org) [aliases: hack,hh]
haml The Haml templating system for Ruby (haml.info) [aliases: HAML]
handlebars the Handlebars and Mustache templating languages [aliases: hbs,mustache]
haskell The Haskell programming language (haskell.org) [aliases: hs]
haxe Haxe Cross-platform Toolkit (http://haxe.org) [aliases: hx,haxe]
hcl Hashicorp Configuration Language, used by Terraform and other Hashicorp tools
hlsl HLSL, the High Level Shading Language for DirectX (docs.microsoft.com/en-us/windows/win32/direct3dhlsl/dx-graphics-hlsl)
hocon Human-Optimized Config Object Notation (https://github.com/lightbend/config)
hql Hive Query Language SQL dialect
html HTML, the markup language of the web
http http requests and responses
hylang The HyLang programming language (hylang.org) [aliases: hy]
idlang Interactive Data Language
igorpro WaveMetrics Igor Pro
ini the INI configuration format
io The IO programming language (http://iolanguage.com)
irb Shell sessions in IRB or Pry [aliases: pry]
isbl The ISBL programming language
j The J programming language (jsoftware.com)
janet The Janet programming language (janet-lang.org) [aliases: jdn]
java The Java programming language (java.com)
javascript JavaScript, the browser scripting language [aliases: js]
jinja Django/Jinja template engine (jinja.pocoo.org) [aliases: django]
jsl The JMP Scripting Language (JSL) (jmp.com)
json JavaScript Object Notation (json.org)
json-doc JavaScript Object Notation with extensions for documentation [aliases: jsonc]
jsonnet An elegant, formally-specified config language for JSON
jsp JSP
jsx An XML-like syntax extension to JavaScript (facebook.github.io/jsx/) [aliases: jsx,react]
julia The Julia programming language [aliases: jl]
kotlin Kotlin Programming Language (http://kotlinlang.org)
lasso The Lasso programming language (lassosoft.com) [aliases: lassoscript]
liquid Liquid is a templating engine for Ruby (liquidmarkup.org)
literate_coffeescript Literate coffeescript [aliases: litcoffee]
literate_haskell Literate haskell [aliases: lithaskell,lhaskell,lhs]
livescript LiveScript, a language which compiles to JavaScript (livescript.net) [aliases: ls]
llvm The LLVM Compiler Infrastructure (http://llvm.org/)
lua Lua (http://www.lua.org)
lustre The Lustre programming language (Verimag)
lutin The Lutin programming language (Verimag)
m68k Motorola 68k Assembler
magik Smallworld Magik
make Makefile syntax [aliases: makefile,mf,gnumake,bsdmake]
markdown Markdown, a light-weight markup language for authors [aliases: md,mkd]
mason The HTML::Mason framework (https://metacpan.org/pod/HTML::Mason)
mathematica Wolfram Mathematica, the world's definitive system for modern technical computing. [aliases: wl]
matlab Matlab [aliases: m]
minizinc MiniZinc is a free and open-source constraint modeling language (minizinc.org)
moonscript Moonscript (http://www.moonscript.org) [aliases: moon]
mosel An optimization language used by Fico's Xpress.
msgtrans RISC OS message translator messages file
mxml MXML
nasm Netwide Assembler
nesasm Nesasm3 assembly (6502 asm) [aliases: nes]
nginx configuration files for the nginx web server (nginx.org)
nim The Nim programming language (http://nim-lang.org/) [aliases: nimrod]
nix The Nix expression language (https://nixos.org/nix/manual/#ch-expression-language) [aliases: nixos]
objective_c an extension of C commonly used to write Apple software [aliases: objc,obj-c,obj_c,objectivec]
objective_cpp an extension of C++ uncommonly used to write Apple software [aliases: objcpp,obj-cpp,obj_cpp,objectivecpp,objc++,obj-c++,obj_c++,objectivec++]
ocaml Objective Caml (ocaml.org)
ocl OMG Object Constraint Language (omg.org/spec/OCL) [aliases: OCL]
openedge The OpenEdge ABL programming language
opentype_feature_file Feature specifications for an OpenType font (adobe-type-tools.github.io/afdko) [aliases: fea,opentype,opentypefeature]
pascal a procedural programming language commonly used as a teaching language.
perl The Perl scripting language (perl.org) [aliases: pl]
php The PHP scripting language (php.net) [aliases: php,php3,php4,php5]
plaintext A boring lexer that doesn't highlight anything [aliases: text]
plist plist [aliases: plist]
postscript The PostScript language (adobe.com/devnet/postscript.html) [aliases: postscr,postscript,ps,eps]
powershell powershell [aliases: posh,microsoftshell,msshell]
praat The Praat scripting language (praat.org)
prolog The Prolog programming language (http://en.wikipedia.org/wiki/Prolog) [aliases: prolog]
prometheus prometheus [aliases: prometheus]
properties .properties config files for Java
protobuf Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data [aliases: proto]
puppet The Puppet configuration management language (puppetlabs.org) [aliases: pp]
python The Python programming language (python.org) [aliases: py]
q The Q programming language (kx.com) [aliases: kdb+]
qml QML, a UI markup language [aliases: qml]
r The R statistics language (r-project.org) [aliases: r,R,s,S]
racket Racket is a Lisp descended from Scheme (racket-lang.org)
reasonml New syntax on top of OCaml ecosystem (reasonml.github.io)
rego The Rego open-policy-agent (OPA) policy language (openpolicyagent.org)
rescript The ReScript programming language (rescript-lang.org)
robot_framework Robot Framework is a generic open source automation testing framework (robotframework.org) [aliases: robot,robot-framework]
ruby The Ruby programming language (ruby-lang.org) [aliases: rb]
rust The Rust programming language (rust-lang.org) [aliases: rs,rust,no_run,rs,no_run,rust,ignore,rs,ignore,rust,should_panic,rs,should_panic]
sas SAS (Statistical Analysis Software)
sass The Sass stylesheet language language (sass-lang.com)
scala The Scala programming language (scala-lang.org) [aliases: scala]
scheme The Scheme variant of Lisp
scss SCSS stylesheets (sass-lang.com)
sed sed, the ultimate stream editor
shell Various shell languages, including sh and bash [aliases: bash,zsh,ksh,sh]
sieve mail filtering language
slice Specification Language for Ice (doc.zeroc.com)
slim The Slim template language
smalltalk The Smalltalk programming language [aliases: st,squeak]
smarty Smarty Template Engine [aliases: smarty]
sml Standard ML [aliases: ml]
solidity Solidity, an Ethereum smart contract programming language
sparql Semantic Query Language, for RDF data
sqf Status Quo Function, a Real Virtuality engine scripting language
sql Structured Query Language, for relational databases
ssh A lexer for SSH configuration files
supercollider A cross-platform interpreted programming language for sound synthesis, algorithmic composition, and realtime performance
swift Multi paradigm, compiled programming language developed by Apple for iOS and OS X development. (developer.apple.com/swift)
systemd A lexer for systemd unit files [aliases: unit-file]
tap Test Anything Protocol [aliases: tap]
tcl The Tool Command Language (tcl.tk)
terraform Terraform HCL Interpolations [aliases: tf]
tex The TeX typesetting system [aliases: TeX,LaTeX,latex]
toml the TOML configuration format (https://github.com/mojombo/toml)
tsx TypeScript-compatible JSX (www.typescriptlang.org/docs/handbook/jsx.html)
ttcn3 The TTCN3 programming language (ttcn-3.org)
tulip the tulip programming language (twitter.com/tuliplang) [aliases: tulip]
turtle Terse RDF Triple Language, TriG
twig Twig template engine (twig.sensiolabs.org)
typescript TypeScript, a superset of JavaScript [aliases: ts]
vala A programming language similar to csharp.
vb Visual Basic [aliases: visualbasic]
vcl The configuration language for Varnish HTTP Cache (varnish-cache.org) [aliases: varnishconf,varnish]
velocity Velocity is a Java-based template engine (velocity.apache.org)
verilog The System Verilog hardware description language
vhdl Very High Speed Integrated Circuit Hardware Description Language
viml VimL, the scripting language for the Vim editor (vim.org) [aliases: vim,vimscript,ex]
vue Vue.js single-file components [aliases: vuejs]
wollok Wollok lang
xml <desc for="this-lexer">XML</desc>
xojo Xojo [aliases: realbasic]
xpath XML Path Language (XPath) 3.1
xquery XQuery 3.1: An XML Query Language
yaml Yaml Ain't Markup Language (yaml.org) [aliases: yml]
yang Lexer for the YANG 1.1 modeling language (RFC7950)
zig The Zig programming language (ziglang.org) [aliases: zir]