eslint

(★ 27,468)

Find and fix problems in your JavaScript code.

File Explorer

Download Latest Version (.zip)

- - bug-report.yml
  - change.yml
  - config.yml
  - docs.yml
  - new-rule.yml
  - new-syntax.yml
  - rule-change.yml
- - ci.yml
  - codeql-analysis.yml
  - docs-ci.yml
  - ecosystem-tests.yml
  - ecosystem-updates.yml
  - pr-labeler.yml
  - rebuild-docs-sites.yml
  - stale.yml
  - types-integration.yml
  - update-readme.yml
- CODEOWNERS
- copilot-instructions.md
- dependabot.yml
- labeler.yml
- PULL_REQUEST_TEMPLATE.md
- renovate.json5
- eslint.js
- ecma-version.js
- globals.js
- replacements.json
- rule-type-list.json
- - src.json
- - code-block-utils.js
  - markdown-it-rule-example.js
  - prism-eslint-hook.js
  - validate-links.js
- .eleventy.js
- .stylelintrc.json
- netlify.toml
- package.json
- postcss.config.js
- README.md
- - hash.js
  - lint-result-cache.js
- - config-loader.js
  - config.js
  - default-config.js
  - flat-config-array.js
  - flat-config-schema.js
- - eslint-helpers.js
  - eslint.js
  - index.js
  - worker.js
- - apply-disable-directives.js
  - esquery.js
  - file-context.js
  - file-report.js
  - index.js
  - interpolate.js
  - linter.js
  - rule-fixer.js
  - source-code-fixer.js
  - source-code-traverser.js
  - source-code-visitor.js
  - timing.js
  - vfile.js
- - index.js
  - rule-tester.js
- - accessor-pairs.js
  - array-bracket-newline.js
  - array-bracket-spacing.js
  - array-callback-return.js
  - array-element-newline.js
  - arrow-body-style.js
  - arrow-parens.js
  - arrow-spacing.js
  - block-scoped-var.js
  - block-spacing.js
  - brace-style.js
  - callback-return.js
  - camelcase.js
  - capitalized-comments.js
  - class-methods-use-this.js
  - comma-dangle.js
  - comma-spacing.js
  - comma-style.js
  - complexity.js
  - computed-property-spacing.js
  - consistent-return.js
  - consistent-this.js
  - constructor-super.js
  - curly.js
  - default-case-last.js
  - default-case.js
  - default-param-last.js
  - dot-location.js
  - dot-notation.js
  - eol-last.js
  - eqeqeq.js
  - for-direction.js
  - func-call-spacing.js
  - func-name-matching.js
  - func-names.js
  - func-style.js
  - function-call-argument-newline.js
  - function-paren-newline.js
  - generator-star-spacing.js
  - getter-return.js
  - global-require.js
  - grouped-accessor-pairs.js
  - guard-for-in.js
  - handle-callback-err.js
  - id-blacklist.js
  - id-denylist.js
  - id-length.js
  - id-match.js
  - implicit-arrow-linebreak.js
  - indent-legacy.js
  - indent.js
  - index.js
  - init-declarations.js
  - jsx-quotes.js
  - key-spacing.js
  - keyword-spacing.js
  - line-comment-position.js
  - linebreak-style.js
  - lines-around-comment.js
  - lines-around-directive.js
  - lines-between-class-members.js
  - logical-assignment-operators.js
  - max-classes-per-file.js
  - max-depth.js
  - max-len.js
  - max-lines-per-function.js
  - max-lines.js
  - max-nested-callbacks.js
  - max-params.js
  - max-statements-per-line.js
  - max-statements.js
  - multiline-comment-style.js
  - multiline-ternary.js
  - new-cap.js
  - new-parens.js
  - newline-after-var.js
  - newline-before-return.js
  - newline-per-chained-call.js
  - no-alert.js
  - no-array-constructor.js
  - no-async-promise-executor.js
  - no-await-in-loop.js
  - no-bitwise.js
  - no-buffer-constructor.js
  - no-caller.js
  - no-case-declarations.js
  - no-catch-shadow.js
  - no-class-assign.js
  - no-compare-neg-zero.js
  - no-cond-assign.js
  - no-confusing-arrow.js
  - no-console.js
  - no-const-assign.js
  - no-constant-binary-expression.js
  - no-constant-condition.js
  - no-constructor-return.js
  - no-continue.js
  - no-control-regex.js
  - no-debugger.js
  - no-delete-var.js
  - no-div-regex.js
  - no-dupe-args.js
  - no-dupe-class-members.js
  - no-dupe-else-if.js
  - no-dupe-keys.js
  - no-duplicate-case.js
  - no-duplicate-imports.js
  - no-else-return.js
  - no-empty-character-class.js
  - no-empty-function.js
  - no-empty-pattern.js
  - no-empty-static-block.js
  - no-empty.js
  - no-eq-null.js
  - no-eval.js
  - no-ex-assign.js
  - no-extend-native.js
  - no-extra-bind.js
  - no-extra-boolean-cast.js
  - no-extra-label.js
  - no-extra-parens.js
  - no-extra-semi.js
  - no-fallthrough.js
  - no-floating-decimal.js
  - no-func-assign.js
  - no-global-assign.js
  - no-implicit-coercion.js
  - no-implicit-globals.js
  - no-implied-eval.js
  - no-import-assign.js
  - no-inline-comments.js
  - no-inner-declarations.js
  - no-invalid-regexp.js
  - no-invalid-this.js
  - no-irregular-whitespace.js
  - no-iterator.js
  - no-label-var.js
  - no-labels.js
  - no-lone-blocks.js
  - no-lonely-if.js
  - no-loop-func.js
  - no-loss-of-precision.js
  - no-magic-numbers.js
  - no-misleading-character-class.js
  - no-mixed-operators.js
  - no-mixed-requires.js
  - no-mixed-spaces-and-tabs.js
  - no-multi-assign.js
  - no-multi-spaces.js
  - no-multi-str.js
  - no-multiple-empty-lines.js
  - no-native-reassign.js
  - no-negated-condition.js
  - no-negated-in-lhs.js
  - no-nested-ternary.js
  - no-new-func.js
  - no-new-native-nonconstructor.js
  - no-new-object.js
  - no-new-require.js
  - no-new-symbol.js
  - no-new-wrappers.js
  - no-new.js
  - no-nonoctal-decimal-escape.js
  - no-obj-calls.js
  - no-object-constructor.js
  - no-octal-escape.js
  - no-octal.js
  - no-param-reassign.js
  - no-path-concat.js
  - no-plusplus.js
  - no-process-env.js
  - no-process-exit.js
  - no-promise-executor-return.js
  - no-proto.js
  - no-prototype-builtins.js
  - no-redeclare.js
  - no-regex-spaces.js
  - no-restricted-exports.js
  - no-restricted-globals.js
  - no-restricted-imports.js
  - no-restricted-modules.js
  - no-restricted-properties.js
  - no-restricted-syntax.js
  - no-return-assign.js
  - no-return-await.js
  - no-script-url.js
  - no-self-assign.js
  - no-self-compare.js
  - no-sequences.js
  - no-setter-return.js
  - no-shadow-restricted-names.js
  - no-shadow.js
  - no-spaced-func.js
  - no-sparse-arrays.js
  - no-sync.js
  - no-tabs.js
  - no-template-curly-in-string.js
  - no-ternary.js
  - no-this-before-super.js
  - no-throw-literal.js
  - no-trailing-spaces.js
  - no-unassigned-vars.js
  - no-undef-init.js
  - no-undef.js
  - no-undefined.js
  - no-underscore-dangle.js
  - no-unexpected-multiline.js
  - no-unmodified-loop-condition.js
  - no-unneeded-ternary.js
  - no-unreachable-loop.js
  - no-unreachable.js
  - no-unsafe-finally.js
  - no-unsafe-negation.js
  - no-unsafe-optional-chaining.js
  - no-unused-expressions.js
  - no-unused-labels.js
  - no-unused-private-class-members.js
  - no-unused-vars.js
  - no-use-before-define.js
  - no-useless-assignment.js
  - no-useless-backreference.js
  - no-useless-call.js
  - no-useless-catch.js
  - no-useless-computed-key.js
  - no-useless-concat.js
  - no-useless-constructor.js
  - no-useless-escape.js
  - no-useless-rename.js
  - no-useless-return.js
  - no-var.js
  - no-void.js
  - no-warning-comments.js
  - no-whitespace-before-property.js
  - no-with.js
  - nonblock-statement-body-position.js
  - object-curly-newline.js
  - object-curly-spacing.js
  - object-property-newline.js
  - object-shorthand.js
  - one-var-declaration-per-line.js
  - one-var.js
  - operator-assignment.js
  - operator-linebreak.js
  - padded-blocks.js
  - padding-line-between-statements.js
  - prefer-arrow-callback.js
  - prefer-const.js
  - prefer-destructuring.js
  - prefer-exponentiation-operator.js
  - prefer-named-capture-group.js
  - prefer-numeric-literals.js
  - prefer-object-has-own.js
  - prefer-object-spread.js
  - prefer-promise-reject-errors.js
  - prefer-reflect.js
  - prefer-regex-literals.js
  - prefer-rest-params.js
  - prefer-spread.js
  - prefer-template.js
  - preserve-caught-error.js
  - quote-props.js
  - quotes.js
  - radix.js
  - require-atomic-updates.js
  - require-await.js
  - require-unicode-regexp.js
  - require-yield.js
  - rest-spread-spacing.js
  - semi-spacing.js
  - semi-style.js
  - semi.js
  - sort-imports.js
  - sort-keys.js
  - sort-vars.js
  - space-before-blocks.js
  - space-before-function-paren.js
  - space-in-parens.js
  - space-infix-ops.js
  - space-unary-ops.js
  - spaced-comment.js
  - strict.js
  - switch-colon-spacing.js
  - symbol-description.js
  - template-curly-spacing.js
  - template-tag-spacing.js
  - unicode-bom.js
  - use-isnan.js
  - valid-typeof.js
  - vars-on-top.js
  - wrap-iife.js
  - wrap-regex.js
  - yield-star-spacing.js
  - yoda.js
- - parser-service.js
  - processor-service.js
  - suppressions-service.js
  - warning-service.js
- - ajv.js
  - assert.js
  - ast-utils.js
  - deep-merge-arrays.js
  - directives.js
  - flags.js
  - logging.js
  - message-counts.js
  - naming.js
  - option-utils.js
  - relative-module-resolver.js
  - runtime-info.js
  - serialization.js
  - severity.js
  - stats.js
  - string-utils.js
  - text-table.js
  - translate-cli-options.js
  - traverser.js
- - config-api.d.ts
  - index.d.ts
  - rules.d.ts
  - universal.d.ts
  - use-at-your-own-risk.d.ts
- api.js
- cli.js
- config-api.js
- options.js
- universal.js
- unsupported-api.js
- all-matched-files-ignored.js
- config-file-missing.js
- config-plugin-missing.js
- config-serialize-function.js
- eslintrc-incompat.js
- eslintrc-plugins.js
- extend-config-missing.js
- failed-to-read-json.js
- file-not-found.js
- invalid-rule-options.js
- invalid-rule-severity.js
- no-config-found.js
- plugin-conflict.js
- plugin-invalid.js
- plugin-missing.js
- rule-unsupported-language.js
- shared.js
- whitespace-found.js
- - base.js
  - cjs.js
  - formatting.js
  - index.js
  - LICENSE
  - nodejs.js
  - package.json
  - README.md
- - LICENSE
  - package.json
  - README.md
- blogpost.md.ejs
- bug-report.md
- formatter-examples.md.ejs
- rule-change-proposal.md
- rule-proposal.md
- - index.js
- - large.js
- - eslint.js
- - eslint-all.js
  - eslint-recommended.js
- - bad-examples.md
  - disable-inline-config.js
  - eslint.config-rule-throws.js
  - eslint.config-with-ignores.js
  - eslint.config-with-ignores2.js
  - eslint.config-with-ignores3.js
  - eslint.config-with-rules.js
  - eslint.config.js
  - fixture-parser.js
  - globals-browser.js
  - globals-nashorn.js
  - globals-node.js
  - globals-webextensions.js
  - good-examples.md
  - missing-semicolon.js
  - passing-es7.js
  - passing.js
  - process-exit.js
  - shebang.js
  - single-quoted.js
  - syntax-error.js
  - undef.js
  - utf8-bom.js
- - api.js
  - cli.js
  - config-api.js
  - options.js
  - universal.js
  - unsupported-api.js
- - messages.js
- - jshint.js
- - check.js
  - package.json
  - test-eslint.config.js
  - tsconfig.json
- - check-rule-examples.js
  - code-sample-minimizer.js
  - config-rule.js
  - eslint-fuzzer.js
- tests.htm
- - index.js
  - multiline-comment-style.js
  - no-invalid-meta.js
- - build-failure-summary.js
  - data.mjs
  - index.mjs
  - plugins-data.json
  - README.md
  - sync-ecosystem-issue.js
  - update.mjs
- check-emfile-handling.js
- check-rule-examples.js
- code-sample-minimizer.js
- commit-readme.sh
- config-rule.js
- eslint-fuzzer.js
- fetch-docs-links.js
- fuzzer-runner.js
- generate-formatter-examples.js
- update-eslint-all.js
- update-eslint-recommended.js
- update-readme.js
- update-rule-type-headers.js
.c8rc
.codeclimate.yml
.editorconfig
.git-blame-ignore-revs
.gitattributes
.gitignore
.markdownlint.yml
.npmrc
.pre-commit-hooks.yaml
.prettierignore
.prettierrc.json
CHANGELOG.md
CONTRIBUTING.md
cypress.config.js
eslint.config.js
knip.jsonc
LICENSE
Makefile.js
package.json
README.md
SUPPORT.md
tsconfig.base.json
tsconfig.types-legacy.json
tsconfig.types.json
webpack.config.js

# Installation Guide

1. Get the code

git clone https://github.com/eslint/eslint

Downloads the entire project code from GitHub to your computer.

cd eslint

Moves into the project folder you just downloaded.

2. Node.js

Easy Recommended

Prerequisites

Git Needed to download the project code from GitHub.
Node.js Node.js must be installed to use npm. The LTS version is recommended.

npm init @eslint/config@latest

Type this command into your terminal and run it.

✅ After running the command, open the address shown in the terminal (usually something like http://localhost:3000) in your browser.

Pulled directly from this repo's README.

// repository documentation

Was this content helpful?

★ 0 (0 ratings)

eslint

File Explorer

# Installation Guide

2. Node.js

Today's picks

Was this content helpful?

Recent Feedback

eslint

File Explorer

# Installation Guide

2. Node.js

Today's picks

Was this content helpful?

Recent Feedback

Download README