How can I check whether JSON is valid?
Paste the JSON and run the formatter. Valid JSON is formatted; malformed JSON produces a syntax error to help locate the problem.
JSON Formatter & Validator
Beautify, format, validate, and minify JSON data with instant syntax error highlighting.
What can the JSON Formatter & Validator do?
Format, validate, beautify, or minify JSON directly in your browser. Clear syntax errors help identify malformed payloads while selectable indentation makes valid data easier to read.
- JSON validation and syntax errors
- Two-space or four-space beautification
- Compact JSON minification
How to use the JSON Formatter & Validator
- 1
Paste the JSON document or API response.
- 2
Choose format, validate, or minify.
- 3
Correct any reported syntax issue, then copy the result.
Frequently Asked Questions
Can I minify JSON online?
Yes. Minify mode removes unnecessary whitespace while preserving the JSON data structure.
Is the JSON sent to a server?
No. Formatting, validation, and minification run locally in your browser.