JSON Formatter and Validator — Free Online
Format, beautify, and validate JSON online for free. Detect syntax errors, minify JSON, and convert between raw and pretty-printed formats instantly.
About JSON Formatter
JSON is the most common data interchange format in modern web development, but raw API responses and minified JSON are hard to read. Our JSON formatter parses your JSON, validates its syntax, and outputs a beautifully indented colour-coded version that is easy to navigate and debug. Syntax errors are highlighted with the exact line and character number. You can also minify JSON back to a compact single line for production use. The tool supports nested objects, arrays, Unicode strings, and all valid JSON data types.
Frequently Asked Questions
Does it validate JSON syntax?
Yes — invalid JSON is flagged with the exact error location and a description of the problem.
Can it minify JSON too?
Yes — compact a formatted JSON string into a single-line minified version.
What JSON features are supported?
All valid JSON types: objects, arrays, strings, numbers, booleans, and null values.
Is there a size limit?
JSON up to 5MB can be formatted.
Can it format JSON from an API response?
Yes — paste any raw API response and it will be instantly formatted and validated.