JSON Input
Enter JSON data.
Key features
- Syntax validation with error location
- Beautify and minify
- Collapsible tree view
Notes
- Indent with 2, 4 spaces or a tab
- Large files handled instantly in-browser
- All processing runs locally in your browser
Related tools
The JSON viewer validates whatever you paste, then formats it for reading or minifies it to a single line. Choose 2-space, 4-space or tab indentation, and copy or download the result.
When you are digging through an API response or editing a config file, it narrows down syntax errors instead of leaving you to hunt blind. Everything runs locally in your browser.
How to use
- Paste JSON into the input box (or load the sample to see the expected shape).
- Press Format to apply readable indentation — 2 spaces, 4 spaces or tabs.
- Press Minify to strip whitespace for transmission or storage.
- Copy the result or save it as a .json file.
Common use cases
- Reading API responses
- Format a single-line response to understand its structure and find the field you need.
- Validating config files
- Confirm an edited JSON config parses cleanly before deploying it.
- Shrinking payloads
- Minify to cut whitespace from payloads you send or store.
Good to know
JSON looks like JavaScript object syntax but is stricter: keys must be double-quoted, and single quotes, trailing commas and comments are all invalid. Those three cause the vast majority of parse errors.
Frequently asked questions
It looks right but fails to parse.
Check the big three: single quotes (only double quotes are valid), a trailing comma after the last item, or comments (JSON has none). Object literals copied out of JavaScript code usually trip on these.
When should I format vs minify?
Format for humans, minify for machines. Minifying changes only whitespace — the data is identical.
Can it handle large JSON?
Files up to several MB process instantly in the browser; beyond that it depends on your device’s memory.
Where does my pasted data go?
Nowhere. Validation, formatting and minification all run in your browser with no server round-trip.