JSON Formatter & Validator

Paste JSON — beautify, minify or validate instantly. Data never leaves your browser.

Quick answer: Free JSON formatter and validator: beautify messy JSON, minify for production, validate syntax with clear error locations. Runs 100% in your browser.

How to use

Open this page on any device — no signup needed.
Fill in the fields above.
Get your result instantly — nothing is uploaded.

About this tool

A JSON formatter re-indents minified JSON into a readable tree, or compresses pretty JSON for production payloads. The validator pinpoints syntax errors (missing commas, unquoted keys, trailing commas) with line and column. APIs, configs and log files are full of JSON — this tool handles them without uploading data anywhere.

FAQ

Why is my JSON invalid?

Common causes: single quotes instead of double, trailing commas, unquoted keys, and Python-style True/False/None (use true/false/null).

Is my API data sent to a server?

No — parsing happens with your browser's own JSON engine, locally.

How large a file can it handle?

Multi-MB payloads are fine; beyond ~10 MB browsers may slow down.

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