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MegaLinter is an 100% Open-Source tool for CI/CD workflows that analyzes consistency and quality of 48 languages, 22 formats, 20 tooling formats , excessive copy-pastes and spelling mistakes in your repository sources, generates various reports, and can even apply formatting and auto-fixes, to ensure all your projects sources are clean, whatever IDE/toolbox are used by their developers.

Ready to use out of the box as a GitHub Action or any CI system, highly configurable and free for all uses

Process

Archi

Console reporter

Screenshot

Github PR reporter

Screenshot

Why MegaLinter

Projects need to contain clean code, in order to avoid technical debt, that makes evolutive maintenance harder and time consuming.

By using code formatters and code linters, you ensure that your code base is easier to read and respects best practices, from the kick-off to each step of the project lifecycle

Not all developers have the good habit to use linters in their IDEs, making code reviews harder and longer to process

By using MegaLinter, you'll enjoy the following benefits for you and your team:

At each pull request it will automatically analyze all updated code in all languages
Reading error logs, developers learn best practices of the language they are using
MegaLinter documentation provides the list of IDE plugins integrating each linter, so developers know which linter and plugins to install
MegaLinter is ready out of the box after a quick setup
Formatting and fixes can be automatically applied on the git branch or provided in reports
This tool is 100% open-source and free for all uses (personal, professional, public and private repositories)
MegaLinter can run on any CI tool and be run locally: no need to authorize an external application, and your code base never leaves your tooling ecosystem

Supported Linters

All linters are integrated in the MegaLinter docker image, which is frequently upgraded with their latest versions

Languages

Language	Linter	Configuration key
BASH	bash-exec	BASH_EXEC
	shellcheck	BASH_SHELLCHECK
	shfmt	BASH_SHFMT
C	cpplint	C_CPPLINT
CLOJURE	clj-kondo	CLOJURE_CLJ_KONDO
COFFEE	coffeelint	COFFEE_COFFEELINT
C++ (CPP)	cpplint	CPP_CPPLINT
C# (CSHARP)	dotnet-format	CSHARP_DOTNET_FORMAT
DART	dartanalyzer	DART_DARTANALYZER
GO	golangci-lint	GO_GOLANGCI_LINT
	revive	GO_REVIVE
GROOVY	npm-groovy-lint	GROOVY_NPM_GROOVY_LINT
JAVA	checkstyle	JAVA_CHECKSTYLE
JAVASCRIPT	eslint	JAVASCRIPT_ES
	standard	JAVASCRIPT_STANDARD
	prettier	JAVASCRIPT_PRETTIER
JSX	eslint	JSX_ESLINT
KOTLIN	ktlint	KOTLIN_KTLINT
LUA	luacheck	LUA_LUACHECK
PERL	perlcritic	PERL_PERLCRITIC
PHP	php	PHP_BUILTIN
	phpcs	PHP_PHPCS
	phpstan	PHP_PHPSTAN
	psalm	PHP_PSALM
POWERSHELL	powershell	POWERSHELL_POWERSHELL
PYTHON	pylint	PYTHON_PYLINT
	black	PYTHON_BLACK
	flake8	PYTHON_FLAKE8
	isort	PYTHON_ISORT
	bandit	PYTHON_BANDIT
	mypy	PYTHON_MYPY
R	lintr	R_LINTR
RAKU	raku	RAKU_RAKU
RUBY	rubocop	RUBY_RUBOCOP
RUST	clippy	RUST_CLIPPY
SALESFORCE	sfdx-scanner-apex	SALESFORCE_SFDX_SCANNER_APEX
	sfdx-scanner-aura	SALESFORCE_SFDX_SCANNER_AURA
	sfdx-scanner-lwc	SALESFORCE_SFDX_SCANNER_LWC
SCALA	scalafix	SCALA_SCALAFIX
SQL	sql-lint	SQL_SQL_LINT
	sqlfluff	SQL_SQLFLUFF
	tsqllint	SQL_TSQLLINT
SWIFT	swiftlint	SWIFT_SWIFTLINT
TSX	eslint	TSX_ESLINT
TYPESCRIPT	eslint	TYPESCRIPT_ES
	standard	TYPESCRIPT_STANDARD
	prettier	TYPESCRIPT_PRETTIER
Visual Basic .NET (VBDOTNET)	dotnet-format	VBDOTNET_DOTNET_FORMAT

Formats

Format	Linter	Configuration key
CSS	stylelint	CSS_STYLELINT
	scss-lint	CSS_SCSS_LINT
ENV	dotenv-linter	ENV_DOTENV_LINTER
GRAPHQL	graphql-schema-linter	GRAPHQL_GRAPHQL_SCHEMA_LINTER
HTML	htmlhint	HTML_HTMLHINT
JSON	jsonlint	JSON_JSONLINT
	eslint-plugin-jsonc	JSON_ESLINT_PLUGIN_JSONC
	v8r	JSON_V8R
	prettier	JSON_PRETTIER
LATEX	chktex	LATEX_CHKTEX
MARKDOWN	markdownlint	MARKDOWN_MARKDOWNLINT
	remark-lint	MARKDOWN_REMARK_LINT
	markdown-link-check	MARKDOWN_MARKDOWN_LINK_CHECK
	markdown-table-formatter	MARKDOWN_MARKDOWN_TABLE_FORMATTER
PROTOBUF	protolint	PROTOBUF_PROTOLINT
RST	rst-lint	RST_RST_LINT
	rstcheck	RST_RSTCHECK
	rstfmt	RST_RSTFMT
XML	xmllint	XML_XMLLINT
YAML	prettier	YAML_PRETTIER
	yamllint	YAML_YAMLLINT
	v8r	YAML_V8R

Tooling formats

Tooling format	Linter	Configuration key
ACTION	actionlint	ACTION_ACTIONLINT
ANSIBLE	ansible-lint	ANSIBLE_ANSIBLE_LINT
ARM	arm-ttk	ARM_ARM_TTK
CLOUDFORMATION	cfn-lint	CLOUDFORMATION_CFN_LINT
DOCKERFILE	dockerfilelint	DOCKERFILE_DOCKERFILELINT
	hadolint	DOCKERFILE_HADOLINT
EDITORCONFIG	editorconfig-checker	EDITORCONFIG_EDITORCONFIG_CHECKER
GHERKIN	gherkin-lint	GHERKIN_GHERKIN_LINT
KUBERNETES	kubeval	KUBERNETES_KUBEVAL
OPENAPI	spectral	OPENAPI_SPECTRAL
PUPPET	puppet-lint	PUPPET_PUPPET_LINT
SNAKEMAKE	snakemake	SNAKEMAKE_LINT
	snakefmt	SNAKEMAKE_SNAKEFMT
TEKTON	tekton-lint	TEKTON_TEKTON_LINT
TERRAFORM	tflint	TERRAFORM_TFLINT
	terrascan	TERRAFORM_TERRASCAN
	terragrunt	TERRAFORM_TERRAGRUNT
	terraform-fmt	TERRAFORM_TERRAFORM_FMT
	checkov	TERRAFORM_CHECKOV
	kics	TERRAFORM_KICS

Other

Code quality checker	Linter	Configuration key
COPYPASTE	jscpd	COPYPASTE_JSCPD
CREDENTIALS	secretlint	CREDENTIALS_SECRETLINT
GIT	git_diff	GIT_GIT_DIFF
SPELL	misspell	SPELL_MISSPELL
	cspell	SPELL_CSPELL

V4 versus V5

Tool to upgrade user repos configuration files using npx mega-linter-runner --upgrade (will upgrade references to nvuillam/mega-linter into megalinter/megalinter)

Migration from github individual repo nvuillam/mega-linter to github organization repo megalinter/megalinter

Migration from docker hub space nvuillam to space megalinter
- Docker images are now megalinter/megalinter or megalinter/megalinter-FLAVOR

Documentation is now hosted at https://megalinter.github.io/

Version management: Now mega-linter docker images, github action and mega-linter-runner versions are aligned
- latest for latest official release
- beta for current content of main branch
- alpha for current content of alpha branch
- docker image, github action and mega-linter-runner can still be called with exact version number

Being more inclusive: rename master branch into main

IGNORE_GITIGNORED_FILES parameter default to true