JSON Formatter & Validator
Format, beautify, minify, and validate JSON. Syntax highlighting, error detection, and tree view. All local.
JSON Input
Formatted Output
JSON Formatter FAQ
What does JSON formatter do?
It takes compact or messy JSON text and adds proper indentation, line breaks, and syntax highlighting to make it readable. It also validates the JSON structure and reports errors with line numbers.
Can it handle large JSON files?
Yes. Since processing is client-side, it can handle JSON files up to several megabytes. Very large files may slow down the browser, but there is no artificial size limit.
Does it fix invalid JSON automatically?
It cannot automatically fix all JSON errors, but it identifies the exact location and nature of syntax errors (missing commas, unmatched brackets, etc.) so you can fix them manually.
Is my JSON data sent to a server?
No. All parsing and formatting happens in your browser. Your JSON data is never transmitted over the network, making it safe for sensitive data like API keys or configuration files.