JSON Formatter & Validator
Validate, pretty-print, minify, and clean JSON — all in your browser.
Editor
Paste raw JSON or upload a file. Your data never leaves your browser.
Waiting for input…
How it works
This tool runs 100% in your browser. Paste JSON or upload a .json file, then click Validate to check syntax. Use Format (Pretty) to add indentation, or Minify to remove whitespace. You can optionally sort keys alphabetically and choose an indent size. Copy or download the result for quick development and data workflows.
FAQs
Is my JSON uploaded to a server?
No. Everything happens locally in your browser. There’s no backend.
Why do I see a line/column in errors?
We read the parser’s error position and map it to a line/column based on your input, so you can fix issues faster.