JSON Formatter & Validator
Beautify, minify, and validate JSON instantly. Syntax errors are pinpointed by line and column. 100% private.
Input: 0 chars
Output: 0 chars
Frequently Asked Questions
How does the JSON formatter work?
Paste JSON, click Format / Minify / Validate. JSON.parse runs in your browser and the output is pretty-printed with your chosen indentation.
Is my data uploaded anywhere?
No. Everything is processed 100% client-side in JavaScript. Your JSON never leaves your device.
What JSON errors are detected?
Missing commas, unquoted keys, trailing commas, mismatched brackets, and invalid escape sequences — with the approximate line and column of the first error.
Format vs. minify — which should I use?
Format for readable debug output. Minify to shrink payloads for APIs and embedded configs where every byte counts.
Does it support JSON5 or comments?
No. This tool validates strict RFC 8259 JSON. Comments and trailing commas are reported as errors.