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Spell Checking


See: Installation

Basic Usage

Example: recursively spell check all JavaScript files in src

JavaScript files

cspell "src/**/*.js"
# or
cspell lint "src/**/*.js"

Check everything

cspell "**"

Adding CSpell to an existing project

In the steps below we will create a cspell configuration file and setup a single custom dictionary for the project.


  1. Create a configuration file
  2. Add words to the project dictionary

1. Create a configuration file.

CSpell can use JSON, Yaml, and JavaScript files for configuration. It automatically searches for one of the following: cspell.json, cspell.config.yaml, cspell.config.cjs.

For now choose to use either JSON or Yaml. Below are examples of each that include a custom dictionary definition. Both of them are equivalent. If you have both, CSpell will look for the .json file first.


  "$schema": "",
  "version": "0.2",
  "dictionaryDefinitions": [
      "name": "project-words",
      "path": "./project-words.txt",
      "addWords": true
  "dictionaries": ["project-words"],
  "ignorePaths": ["node_modules", "/project-words.txt"]


version: '0.2'
  - name: project-words
    path: './project-words.txt'
    addWords: true
  - project-words
  - 'node_modules'
  - '/project-words.txt'

These configuration files do three things:

  1. Define the custom dictionary project-words.
  2. Tell the spell checker to use the custom dictionary.
  3. Tell the spell checker to ignore any files inside of node_modules and the file project-words.txt.

2. Add words to the project dictionary

It might take a few iterations to get fully setup, but the process in the same.


  1. Create the dictionary file

    touch project-words.txt
  2. Choose a set of files to start with, like all Markdown files, **/*.md and run the spell checker.

    cspell "**/*.md"
  3. Look for any directories that need to be ignored and add them to ignorePaths. Example:

    • "bin" - to ignore any directory / file called bin.
    • "translations/**" - to ignore all files under the translations directory.
    • "packages/*/dist" - to ignore the dist directory in each package.

    Once you have finished identifying directories and files to be ignored, it is now time to add words to the custom dictionary.

  4. Have CSpell populate it with the words from your project.

    echo "# New Words" >> project-words.txt
    cspell --words-only --unique "**/*.md" | sort --ignore-case >> project-words.txt

    This will append all new issues to the end of project-words.txt

  5. Review the words in project-words.txt to check for any actual misspellings and remove them (the spell checker already thinks they are wrong).

  6. Fix spelling issues.

    To show the issues and suggestions, use:

    cspell --no-progress --show-suggestions --show-context "**/*.md"
  7. Repeat the process with the other file types you want to check.

3. Fine-tuning

The following resources can help you with fine-tuning your configurations:


Command: lint – Spell Checking

The lint command is used for spell checking files.


cspell lint --help


Usage: cspell lint [options] [globs...]

Check spelling

  -c, --config <cspell.json>   Configuration file to use.  By default cspell
                               looks for cspell.json in the current directory.

  -v, --verbose                Display more information about the files being
                               checked and the configuration.

  --locale <locale>            Set language locales. i.e. "en,fr" for English
                               and French, or "en-GB" for British English.

  --language-id <language>     Force programming language for unknown
                               extensions. i.e. "php" or "scala"

  --words-only                 Only output the words not found in the

  -u, --unique                 Only output the first instance of a word not
                               found in the dictionaries.

  -e, --exclude <glob>         Exclude files matching the glob pattern. This
                               option can be used multiple times to add
                               multiple globs.

  --file-list <path or stdin>  Specify a list of files to be spell checked. The
                               list is filtered against the glob file patterns.
                               Note: the format is 1 file path per line.

  --no-issues                  Do not show the spelling errors.
  --no-progress                Turn off progress messages
  --no-summary                 Turn off summary message in console.
  -s, --silent                 Silent mode, suppress error messages.
  -r, --root <root folder>     Root directory, defaults to current directory.
  --relative                   Issues are displayed relative to root.
  --show-context               Show the surrounding text around an issue.
  --show-suggestions           Show spelling suggestions.
  --no-must-find-files         Do not error if no files are found.

  --cache                      Only check changed files. (default: false)

  --cache-strategy <strategy>  Strategy to use for detecting changed files.
                               (choices: "metadata", "content")

  --cache-location <path>      Path to the cache file or directory. (default:

  --dot                        Include files and directories starting with `.`
                               (period) when matching globs.

  --gitignore                  Ignore files matching glob patterns found in
                               .gitignore files.

  --no-gitignore               Do NOT use .gitignore files.
  --gitignore-root <path>      Prevent searching for .gitignore files past

  --no-color                   Turn off color.
  --color                      Force color.
  --debug                      Output information useful for debugging
                               cspell.json files.
  -h, --help                   display help for command

    cspell "*.js"                   Check all .js files in the current directory
    cspell "**/*.js"                Check all .js files from the current directory
    cspell "src/**/*.js"            Only check .js under src
    cspell "**/*.txt" "**/*.js"     Check both .js and .txt files.
    cspell "**/*.{txt,js,md}"       Check .txt, .js, and .md files.
    cat LICENSE | cspell stdin      Check stdin