JSON Lint — Lint and Fix JSON Errors Automatically
Lint JSON data to find and auto-fix common issues like trailing commas, single quotes, and unquoted keys. Get actionable error messages with one-click fixes.
JSON Lint vs. JSONLint.com
This tool offers the same core validation as the classic JSONLint website but adds auto-repair capabilities, syntax highlighting, dark mode support, and offline functionality as a progressive web app. It also handles larger files and provides more descriptive error messages with suggested fixes for each issue.
Frequently Asked Questions
Validation checks if JSON is syntactically correct and gives a pass/fail result. Linting goes further by identifying style issues, suggesting fixes, and optionally auto-repairing common mistakes like trailing commas or single-quoted strings.
Yes. Click the 'Auto-Fix' button to apply all safe repairs at once. The tool fixes trailing commas, converts single quotes to double quotes, wraps unquoted keys in quotes, and removes JavaScript-style comments.
Yes. The linter recognizes both single-line (//) and multi-line (/* */) comments. It can strip them to produce valid JSON or preserve them if you are working with a tool that supports JSONC.