JSON Formatter & Validator — Beautify or Minify
About the JSON Formatter
Paste JSON and this tool tells you instantly whether it is valid — and if not, exactly where it breaks, with the error position. Valid JSON is beautified with your choice of indentation, or minified to its smallest form for shipping.
Because everything runs locally in your browser, it is safe for API responses, config files and payloads containing tokens or personal data. Files up to several megabytes format without breaking a sweat.
How to use the JSON Formatter
- Paste your JSON into the input area.
- Click Beautify to pretty-print (choose 2 or 4 spaces) or Minify to compress.
- Invalid JSON shows a precise error message instead — fix and format again.
Frequently asked questions
Is my JSON uploaded to a server?
No. Parsing, formatting and minifying all happen in your browser with JavaScript. Nothing leaves your machine, which makes the tool safe for confidential payloads.
What is the difference between JSON and JavaScript object literals?
JSON requires double-quoted keys and string values, allows no trailing commas, and has no comments or functions. The validator enforces strict JSON per RFC 8259.
Can it handle large files?
Yes — files of several megabytes format in well under a second on a typical laptop.
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