JSON Formatter & Validator
Format, prettify, minify, and validate JSON with error locations.
Run Format to see prettified JSON here.About JSON Formatter & Validator
Format, prettify, and validate JSON instantly. Spot errors with exact line numbers. Free & private. This tool operates completely in your web browser. No text inputs are ever sent to remote servers or stored in any database, ensuring 100% data privacy for code, API payloads, or confidential documents.
Client-Side Privacy Guarantee
All text transformations run inside your browser tab. Zero server logging or tracking.
100% Private & Offline Capable
Executes locally via JavaScript. Your text never leaves your device.
Instant Real-Time Results
No network latency or server waits. See outputs instantly as you type.
Frequently Asked Questions
Is my JSON data sent to an external server?
No, never. All JSON parsing, syntax validation, prettifying, and minification execute entirely in your browser memory. Sensitive API keys or credentials remain confidential.
How does the syntax error validator work?
When JSON is invalid, the parser points to the exact line and character column containing the error (such as a missing comma, trailing comma, unescaped quote, or unmatched bracket).
Can I minify JSON for production API calls?
Yes. Click Minify to strip all superfluous whitespace, indentations, and line breaks, compressing JSON size for network requests.
Can I format large JSON files?
Because parsing runs directly in your local hardware memory without server upload delays, you can format multi-megabyte JSON payloads seamlessly.