JSON Formatter & Validator
Turn messy JSON into readable output in one click, and catch errors in seconds. Your data never leaves your browser.
Error:
✓ Valid JSON
How to use
- Paste your JSON on the left.
- Choose an indent size, or minify.
- Copy the formatted output on the right.
Everything stays in your browser — nothing is sent to our servers.
Answers, quickly
Is my JSON data safe?
Yes. All formatting and validation runs inside your browser; your JSON is never sent to our servers.
How large can the JSON be?
Modern browsers handle several MB of JSON comfortably. Very large files may hit browser memory limits.
What does the indent option do?
Choose 2 or 4 spaces for readable output, or pick "Minify" to strip all whitespace and get a minified JSON.
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