JSON Formatter & Validator
Paste JSON to pretty-print, minify, and validate it — all in your browser, nothing uploaded. Free, no sign-up.
Try an example
A compact JSON object — load it, then press Format to indent it.
{"brand":"SGBP","city":"Singapore","services":["web design","web apps","AI"],"since":2024,"active":true}Format vs minify
Use Format while you are reading or debugging — indentation makes structure obvious and errors easy to spot. Use Minify for production payloads and config you ship over the wire, where every byte counts. Both keep your data identical; only the whitespace changes.
Frequently asked questions
What does this tool do?
It checks that your JSON is valid and either pretty-prints it with clean indentation or minifies it to a single line. Invalid JSON is flagged with the exact error so you can fix it.
How do I use it?
Paste your JSON, then press Format to indent it or Minify to compact it. The status line tells you immediately whether the JSON is valid.
Does it change my data?
No — it only re-formats. The keys, values and structure stay exactly the same; minifying just removes whitespace.
Is my JSON uploaded anywhere?
No. Everything runs in your browser, so sensitive JSON never leaves your machine.