{devbox/kit} JSON, Base64, URL, timestamps, regex — one page

JSON Formatter & Validator

Beautify, minify, and validate JSON — with the exact line and column of any syntax error.

Runs 100% in your browser•Nothing is uploaded to a server•Free forever

JSON Formatter Base64 URL Encode/Decode Timestamp Regex Tester

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About this JSON formatter

    
Paste any JSON and hit Format / Beautify to indent it cleanly, or Minify to strip every non-essential byte for the wire. If the JSON is invalid, the validator reports the precise line and column so you can jump straight to the problem instead of counting characters. Everything runs locally in your browser — nothing you paste is ever uploaded. For the syntax rules and the errors that trip people up most, read the JSON formatting guide.


    
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