JSON Formatter
Paste any JSON payload to beautify, validate or minify it. Errors are reported with exact positions, and everything stays in your browser.
How to use the JSON Formatter
Paste your JSON into the input box, or click Sample to try it out.
Click Format to pretty-print with 2-space indentation, or Minify to compress.
Click Validate to check syntax — errors show the exact position.
Use Copy or Download to take the result with you.
Frequently asked questions
Is my JSON uploaded anywhere?
No. Parsing and formatting run entirely in your browser with the native JSON engine — your data never leaves this page.
What is the maximum file size?
Very large documents (tens of MB) may slow down the editor, but typical API payloads and config files format instantly.
Can it fix invalid JSON?
The validator pinpoints syntax errors so you can fix them manually; it will not guess or auto-repair malformed structures.