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Format, minify and validate JSON instantly. Clear, position-aware error messages make debugging fast — and everything runs locally in your browser.
Runs locally — your JSON never leaves your browser.
JSON (JavaScript Object Notation) is the lightweight data format that powers most of the modern web — every REST API, configuration file and NoSQL database record uses it. It is made of key-value pairs, arrays and nested objects that are easy for machines to read but genuinely hard for humans to scan in a single long line.
Formatting (or "pretty-printing") JSON adds indentation and line breaks so the structure becomes visible at a glance. This tool beautifies, minifies and validates JSON with errors that point you to the exact position of the problem.
The most frequent mistakes our validator catches:
, after the last item in an object or array. JSON does not allow them.} or ] at the end of a long payload.When validation fails, we highlight the offending line and show a position indicator like Line 4, column 17 — expected , or } so you know exactly where to look.
Minified JSON removes every space, tab and newline, shrinking payloads for storage and transport. For large API responses, minifying can cut file size by up to 30%, which means faster downloads and lower bandwidth bills. Use Minify when preparing payloads for production, and Format when you need to read or debug them.
Combined with our Base64 encoder and URL encoder, you can move JSON between tools, APIs and storage formats without leaving the browser.
Parsing, validation, beautifying and minifying all run locally with the browser's native JSON.parse engine. Nothing you paste is uploaded, stored or logged — so it is safe to run configs, keys and internal API responses through it.
If you are moving JSON around web apps, pair this with our UUID generator for IDs and the hash generator for checksums.
Frequently Asked
Common questions about formatting and validating JSON, answered by our web experts.
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