Free Online JSON Formatter and Validator
Format and validate JSON, including JSON found inside pasted text. Inspect nested data and syntax errors, then copy or download the result.
Local browser processing
No registration
Supported inputs, outputs, and browsers
- Supported input
- Pasted JSON, JSON or text file
- Output
- Copyable text, UTF-8 TXT
- Browser compatibility
- Use a current version of Chrome, Edge, Firefox, or Safari with JavaScript, File API, Canvas, and downloads enabled. Available memory and browser format support can limit very large files.
How to use JSON Formatter
- 1.Paste a payload or choose a text file, inspect each detected JSON result, and compare quoted strings and numeric values.
- 2.Run the operation with the displayed controls, then open and review the result before sharing it.
Limitations
- Valid JSON syntax does not prove that a payload follows your application's schema or contains correct business data.
Privacy and processing
Local browser processing
The input content never leaves your device. Processing happens inside your browser, with no file or text upload to an external processing server. No registration is required, so the content-processing step is private to your device.
Frequently asked questions
What should I know before using JSON Formatter?
Valid JSON syntax does not prove that a payload follows your application's schema or contains correct business data.
Where is my input processed?
The input content never leaves your device. Processing happens inside your browser, with no file or text upload to an external processing server. No registration is required, so the content-processing step is private to your device.