Paste the JSON and it is parsed, then either pretty-printed with indentation for reading or minified for production, with the position of any syntax error reported. Strict JSON rejects trailing commas, single quotes, unquoted keys and comments — between them the cause of almost every parse failure.
Last updated 2026-07-30
Pretty-print messy JSON, minify it for production, and get precise syntax errors when something is malformed. Your payloads stay in the browser, which matters when they contain tokens or customer data.
How to use JSON Formatter and Validator
Paste your JSON — Drop in the JSON you want to inspect.
Format or minify — Beautify with indentation for reading, or minify to strip every unnecessary byte.
Fix any errors — Invalid JSON is reported with the position of the problem so you can correct it.
Frequently asked questions
Is it safe to paste production data here?
Parsing happens entirely in your browser with no network request, so nothing is transmitted. Even so, follow your organisation's policy on handling live credentials.
Why does my JSON fail to parse?
The usual causes are trailing commas, single quotes instead of double quotes, unquoted keys, and comments. Strict JSON allows none of these.
Are my files uploaded to a server?
No. Every conversion runs inside your own browser using JavaScript and WebAssembly. Your files never leave your device, which means there is nothing for us to store, read, or leak.
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