Free JSON Formatter & Validator
Format, minify and validate JSON with syntax highlighting and precise error locations.
100% private — your data never leaves your browser
No sign-up, no limits, no uploads. Paste your JSON below — everything runs locally in this page.
Need JSON tools in bulk?
Orderly Tools Pro adds batch conversion, JSON ↔ CSV ↔ YAML, schema validation and large-file handling — one payment, yours forever.
Get Pro — $29 one-timeFrequently asked questions
Is my JSON uploaded anywhere?
No. Formatting, validation and minification all happen in JavaScript inside your browser. Your data never leaves your device — safe even for API keys and private payloads (though you should still avoid pasting real secrets into any website).
What does the validator tell me?
Besides a simple valid/invalid verdict, it reports the exact line and column of the first syntax error, plus a count of keys and the maximum nesting depth of your document.
Can I convert JSON to CSV?
Not yet in the free version — batch conversion between JSON, CSV and YAML is planned for Orderly Tools Pro.