JSON Formatter & Validator
Beautify, minify, and validate JSON payloads for developers, analysts, and API testers.
JSON Formatter & Validator
This calculator auto-updates when values change.
Valid JSON.
About This JSON Formatter & Validator
This JSON formatter and validator parses JSON text and converts it into readable formatted output or compact minified output.
It is useful when testing APIs, reviewing configuration files, cleaning pasted data, or checking syntax errors.
How to Use This Tool
- 1
Paste JSON
Enter the JSON payload you want to format, minify, or validate.
- 2
Choose an action
Format for readability, minify for compact output, or validate syntax.
- 3
Fix any errors
If parsing fails, use the error message to correct the input.
Frequently Asked Questions
Does this change JSON values?v
No. Formatting and minifying preserve the parsed data while changing whitespace.
Why is my JSON invalid?v
Common issues include trailing commas, unquoted keys, single quotes, or missing closing braces.
Can it format JavaScript objects?v
No. It expects valid JSON, which is stricter than JavaScript object syntax.