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JSON formatter & validator

Prettify, minify and validate JSON instantly in the browser. Syntax errors are highlighted with exact positions. No data is sent to any server.

Input JSON

Output

About this JSON formatter

This tool formats JSON with configurable indentation (2 spaces, 4 spaces, or compact). It validates the JSON structure and highlights any syntax errors with clear messages showing exactly where the problem is. All processing happens in your browser — no data is ever sent to a server.

Features

API access

Need to format JSON programmatically? Use POST /api/v1/datatools/format/json with body {"input": "your json string"}.

Frequently asked questions

Is my JSON data private? +
Yes. This tool processes everything in your browser using JavaScript. Nothing is sent to any server. You can verify this by checking the browser network tab.
What's the maximum file size? +
Browser-based processing works well up to around 5MB. For larger files, use the API endpoint which supports up to 2MB per request, or process server-side.

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