JSON Formatter + Validator

Format, minify, validate JSON — runs locally in your browser. No uploads.

JSON Formatter & Validator Online

This free JSON formatter helps you format, validate, and minify JSON instantly. It works directly in your browser so your data stays private.

Why format JSON?

Formatted JSON is easier to read, debug, and share. Developers often format JSON to find errors like missing commas or incorrect brackets.

Common JSON mistakes

Trailing commas
Using single quotes instead of double quotes
Missing brackets or braces
Incorrect nesting

How to use this tool

Paste your JSON into the editor above, click Format or Validate, and instantly see the result.