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JSON Formatter
Paste JSON and get it beautified with your preferred indentation, minified for production, or validated with a precise error location. Your data never leaves the browser. No sign-up, free.
Options
Input
0 words · 0 characters · 0 lines
Output
Runs 100% in your browser No length or usage limits Free, no sign-up
How to format JSON
Paste your JSON
Drop raw or minified JSON into the input - API responses, config files, logs.
Pick the style
Choose 2-space, 4-space or tab indentation for readability, or Minified to strip every unnecessary byte.
Fix errors fast
Invalid JSON shows the parser error with the line and column where it broke, so you can fix it immediately.
JSON formatting questions, answered
Is my text sent to a server?
No. Parsing and formatting happen inside your browser's own JSON engine. API responses, config files and payloads with secrets never leave your machine - there is no request to inspect in your network tab.
Why does my JSON fail to parse?
The most common culprits: trailing commas, single quotes instead of double, unquoted keys, and comments - none are allowed in strict JSON. The error message points at the exact line.
Does formatting change my data?
No. Formatting only changes whitespace; keys, values and their order are preserved exactly. Minifying is equally lossless.
Is there a size limit?
No fixed limit - multi-megabyte files parse in milliseconds since everything runs locally.