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markdownlint

GitHub stars formatter GitHub release (latest SemVer) GitHub last commit GitHub commit activity GitHub contributors

Checks for errors in Markdown files, and can also auto-fix some of them.

MarkdownLint is run through markdownlint-cli

To see MarkdownLint version, you can have a look in the dependencies of latest markdownlint-cli version.

markdownlint documentation

markdownlint - GitHub

Configuration in MegaLinter

Variable Description Default value
MARKDOWN_DEFAULT_STYLE For markdownlint to be active, MARKDOWN_DEFAULT_STYLE must be markdownlint markdownlint
MARKDOWN_MARKDOWNLINT_ARGUMENTS User custom arguments to add in linter CLI call
Ex: -s --foo "bar"
MARKDOWN_MARKDOWNLINT_COMMAND_REMOVE_ARGUMENTS User custom arguments to remove from command line before calling the linter
Ex: -s --foo "bar"
MARKDOWN_MARKDOWNLINT_FILTER_REGEX_INCLUDE Custom regex including filter
Ex: (src\|lib)
Include every file
MARKDOWN_MARKDOWNLINT_FILTER_REGEX_EXCLUDE Custom regex excluding filter
Ex: (test\|examples)
Exclude no file
MARKDOWN_MARKDOWNLINT_CLI_LINT_MODE Override default CLI lint mode
- file: Calls the linter for each file
- list_of_files: Call the linter with the list of files as argument
- project: Call the linter from the root of the project
list_of_files
MARKDOWN_MARKDOWNLINT_FILE_EXTENSIONS Allowed file extensions. "*" matches any extension, "" matches empty extension. Empty list excludes all files
Ex: [".py", ""]
[".md"]
MARKDOWN_MARKDOWNLINT_FILE_NAMES_REGEX File name regex filters. Regular expression list for filtering files by their base names using regex full match. Empty list includes all files
Ex: ["Dockerfile(-.+)?", "Jenkinsfile"]
Include every file
MARKDOWN_MARKDOWNLINT_PRE_COMMANDS List of bash commands to run before the linter None
MARKDOWN_MARKDOWNLINT_POST_COMMANDS List of bash commands to run after the linter None
MARKDOWN_MARKDOWNLINT_UNSECURED_ENV_VARIABLES List of env variables explicitly not filtered before calling MARKDOWN_MARKDOWNLINT and its pre/post commands None
MARKDOWN_MARKDOWNLINT_CONFIG_FILE markdownlint configuration file nameUse LINTER_DEFAULT to let the linter find it .markdownlint.json
MARKDOWN_MARKDOWNLINT_RULES_PATH Path where to find linter configuration file Workspace folder, then MegaLinter default rules
MARKDOWN_MARKDOWNLINT_DISABLE_ERRORS Run linter but consider errors as warnings true
MARKDOWN_MARKDOWNLINT_DISABLE_ERRORS_IF_LESS_THAN Maximum number of errors allowed 0
MARKDOWN_MARKDOWNLINT_CLI_EXECUTABLE Override CLI executable ['markdownlint']

IDE Integration

Use markdownlint in your favorite IDE to catch errors before MegaLinter !

IDE Extension Name Install
Atom linter-node-markdownlint Visit Web Site
Sublime Text SublimeLinter-contrib-markdownlint Visit Web Site
vim coc-markdownlint Visit Web Site
Visual Studio Code vscode-markdownlint Install in VSCode

MegaLinter Flavours

This linter is available in the following flavours

Flavor Description Embedded linters Info
all Default MegaLinter Flavor 124 Docker Image Size (tag) Docker Pulls
c_cpp Optimized for pure C/C++ projects 54 Docker Image Size (tag) Docker Pulls
cupcake MegaLinter for the most commonly used languages 83 Docker Image Size (tag) Docker Pulls
documentation MegaLinter for documentation projects 50 Docker Image Size (tag) Docker Pulls
dotnet Optimized for C, C++, C# or VB based projects 62 Docker Image Size (tag) Docker Pulls
dotnetweb Optimized for C, C++, C# or VB based projects with JS/TS 71 Docker Image Size (tag) Docker Pulls
formatters Contains only formatters 17 Docker Image Size (tag) Docker Pulls
go Optimized for GO based projects 52 Docker Image Size (tag) Docker Pulls
java Optimized for JAVA based projects 53 Docker Image Size (tag) Docker Pulls
javascript Optimized for JAVASCRIPT or TYPESCRIPT based projects 60 Docker Image Size (tag) Docker Pulls
php Optimized for PHP based projects 55 Docker Image Size (tag) Docker Pulls
python Optimized for PYTHON based projects 63 Docker Image Size (tag) Docker Pulls
ruby Optimized for RUBY based projects 51 Docker Image Size (tag) Docker Pulls
rust Optimized for RUST based projects 51 Docker Image Size (tag) Docker Pulls
salesforce Optimized for Salesforce based projects 55 Docker Image Size (tag) Docker Pulls
swift Optimized for SWIFT based projects 51 Docker Image Size (tag) Docker Pulls
terraform Optimized for TERRAFORM based projects 55 Docker Image Size (tag) Docker Pulls

Behind the scenes

How are identified applicable files

  • File extensions: .md

How the linting is performed

  • markdownlint is called once with the list of files as arguments (list_of_files CLI lint mode)

Example calls

markdownlint myfile.md
markdownlint -c .markdownlint.json myfile.md
markdownlint --fix -c .markdownlint.json myfile.md

Help content

Usage: markdownlint [options] <files|directories|globs>

MarkdownLint Command Line Interface

Options:
  -V, --version                              output the version number
  -c, --config <configFile>                  configuration file (JSON, JSONC, JS, YAML, or TOML)
  --configPointer <pointer>                  JSON Pointer to object within configuration file (default: "")
  -d, --dot                                  include files/folders with a dot (for example `.github`)
  -f, --fix                                  fix basic errors (does not work with STDIN)
  -i, --ignore <file|directory|glob>         file(s) to ignore/exclude (default: [])
  -j, --json                                 write issues in json format
  -o, --output <outputFile>                  write issues to file (no console)
  -p, --ignore-path <file>                   path to file with ignore pattern(s)
  -q, --quiet                                do not write issues to STDOUT
  -r, --rules <file|directory|glob|package>  include custom rule files (default: [])
  -s, --stdin                                read from STDIN (does not work with files)
  --enable <rules...>                        Enable certain rules, e.g. --enable MD013 MD041 --
  --disable <rules...>                       Disable certain rules, e.g. --disable MD013 MD041 --
  -h, --help                                 display help for command

Installation on mega-linter Docker image