JSON Formatter
Format, validate, and minify JSON instantly. Free, no data sent to servers.
Common JSON errors and how to fix them →New to JSON? Read our guide →What is a JSON Formatter?
A JSON formatter takes raw, unindented or minified JSON and outputs it in a human-readable structure with consistent indentation.
It makes deeply nested objects and arrays easy to read at a glance, which helps most when working with API responses or config files.
JSON Validation explained
Valid JSON must follow strict syntax rules: keys must be quoted strings, values can be strings, numbers, booleans, null, arrays or objects. A single missing comma or trailing comma breaks the whole document.
The validator pinpoints the exact error so you can fix it immediately.
Minify JSON for production
Minifying removes all unnecessary whitespace, reducing payload size for API responses and config files. A 10 KB formatted JSON typically compresses to under 4 KB, a meaningful saving at scale.
All processing happens in your browser; your data never leaves your machine.