How to format, validate and fix broken JSON online
JSON (JavaScript Object Notation) is everywhere in web development, APIs, and config files. But broken JSON—missing commas, mismatched quotes, trailing delimiters—breaks your application and wastes time debugging. You need fast, reliable tools to format, validate, and repair JSON without leaving your browser or uploading sensitive data.
Why JSON validation matters
A single syntax error renders entire JSON objects invalid. Missing commas between properties, unescaped quotes inside strings, and unterminated arrays are common culprits. Catching these errors early saves debugging time and prevents runtime failures in production.
Format JSON for readability
Raw JSON often arrives as a single long line. The JSON formatter expands it into indented, readable output—making nested structures obvious at a glance. Proper formatting also exposes structural errors that are invisible in minified JSON.
Validate JSON syntax
Before deploying JSON config or sending it to an API, validate its structure. The JSON formatter also validates syntax as you paste, flagging errors like unclosed brackets or mismatched quotes so you can fix them immediately.
Escape special characters
JSON strings must escape certain characters—quotes, backslashes, control characters. If you're embedding text inside a JSON string, use the JSON escape tool to safely encode problematic characters and prevent breaking your JSON structure.
Compare JSON versions
When debugging API responses or config changes, side-by-side comparison reveals exactly what changed. The JSON diff tool highlights additions, deletions, and modifications between two JSON objects, making it easy to spot unintended changes or troubleshoot mismatched data.
Organize with sorted JSON
Large JSON files become hard to navigate without consistent key ordering. The Sort JSON tool recursively orders all keys alphabetically, making it easier to find properties by eye and reducing merge conflicts when multiple people edit the same file.
Privacy: your JSON stays on your device
All TextArray tools run entirely in your browser. Your JSON never leaves your device, never touches a server, and the tools work offline after the page loads. No account, no login, no tracking. Paste sensitive config, API responses, or internal data with confidence.