DEVELOPER
JSON Formatter & Validator
Format, minify, validate JSON data with a collapsible tree view and syntax highlighting.
Size: 124 bytes
Free JSON Formatter, Validator & Viewer
Format, minify, and validate JSON instantly with a collapsible tree view. Perfect for debugging API responses, cleaning config files, and inspecting nested data structures.
Everything runs in your browser — your JSON never leaves your device.
How to use
- Paste or type JSON into the editor.
- Click Format, Minify, or Validate.
- Explore the parsed tree view below for nested objects and arrays.
Frequently Asked Questions
- Is this safe for sensitive JSON data?
- Yes. Parsing and formatting happen entirely in your browser. Nothing is uploaded to a server.
- Can I minify JSON here too?
- Yes. Use the Minify button to remove whitespace and produce a compact single-line JSON string.
- Will invalid JSON show where the error is?
- When possible, the validator reports the parse error message along with an approximate line and column.