JSON Formatter / Minifier

About this calculator

This tool takes a block of JSON text and either pretty-prints it — adding indentation and line breaks so nested objects and arrays are readable — or minifies it down to a single compact line, and it flags syntax errors like a missing comma or an unclosed bracket that would otherwise make the JSON fail to parse.

Developers use the pretty-print side constantly when inspecting an API response, a config file, or a webhook payload that arrives as an unreadable single-line string, and use the minify side when preparing JSON to ship in production — smaller payloads mean less bandwidth and faster load times. It's also a fast way to check whether a hand-edited config file or a copy-pasted API response is actually valid JSON before it causes a parsing error somewhere else in the code.