Registry / testing / eslint-plugin-json

eslint-plugin-json

library4.0.1jsnpmunverified

ESLint plugin for linting JSON files. Version 4.0.1 supports ESLint flat config and requires Node >=18. It uses VSCode's JSON parser for linting, replacing JSHint in v1.3.1. Recommended for ensuring valid JSON, catching duplicate keys, trailing commas, and other issues. Supports allowing comments. The plugin ships with recommended configs for both flat and legacy ESLint formats.

testing

npm install eslint-plugin-json

github ↗package ↗

INSTALL

IMPORT

SIG · ESLINT-PLUGIN-JSON

eslint-plugin-json

testingjavascriptv4.0.1

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

default

✓ import json from 'eslint-plugin-json'

ESM import for flat config (ESLint v9+). Also works with require in legacy.

json

✓ import json from 'eslint-plugin-json'

Import the plugin object for flat config.

configs (recommended)

✓ json.configs['recommended']

Access recommended config for flat config.

configs (recommended-legacy)

✓ json.configs['recommended-legacy']

Access legacy recommended config for .eslintrc.

Basic flat config setup to lint all .json files using the recommended config.

// eslint.config.js (flat config) import json from 'eslint-plugin-json'; export default [ { files: ['**/*.json'], ...json.configs['recommended'] } ]; // Then run: npx eslint . --ext .json

Debug

Known issues

breakingESLint v9+ requires flat config; plugin v4+ needed.

fix

Use eslint-plugin-json v4+ and flat config format (eslint.config.js).

affects: >=9

breakingESLint v9 dropped --ext flag support for some formats; use files in flat config.

fix

Define files glob in eslint.config.js instead of --ext .json.

affects: >=9

gotchaThe rule json/* applies all linting rules; configuring individual rules may override.

fix

Use individual rules like 'json/undefined' for granular control, or set severity on json/*.

affects: >=1.0

gotchaLegacy configs (recommended-legacy) are deprecated in favor of flat config.

fix

Migrate to flat config and use recommended config.

affects: >=4.0

deprecatedUse of .eslintrc config format is deprecated for new projects with ESLint v9+.

fix

Switch to eslint.config.js (flat config).

affects: >=9

Errors

Common errors & fixes

Failed to load plugin 'json': Cannot find module 'eslint-plugin-json'

Plugin not installed or not in node_modules.

fix

npm install --save-dev eslint-plugin-json

ESLint: Error while loading rule 'json/undefined': Rule not found

Legacy config using individual rules without specifying processor.

fix

Add processor: 'json/json' in flat config or use recommended config.

ESLint: Expected linebreaks to be 'LF' but found 'CRLF'

This rule is from another plugin (e.g., eslint-plugin-linebreak), not this one.

fix

This is not a json plugin issue; configure linebreak-style rule elsewhere.

Upgrade

Version history

4.0.1latest on npm

Audit

Dependencies

eslintrequiredpeer dependency - plugin requires ESLint to run

Agent activity

2 hits · last 30 days

node

Resources

githubhttps://github.com/azeemba/eslint-plugin-json ↗

packagehttps://www.npmjs.com/package/eslint-plugin-json ↗