JSON Formatter & Validator
Beautify, minify, and validate JSON. Instant syntax check with error line reporting.
Bytes
98
Keys
5
Objects
2
Arrays
1
Format, minify, validate
Paste any JSON payload — API response, config file, log entry — and instantly get a beautified version with configurable indent, a minified single-line form, and validation with the exact error location if syntax is broken. Runs 100% in your browser.
How the JSON Formatter Works
This tool takes messy or minified JSON and reformats it into clean, indented, readable structure — while also validating that the syntax is correct. A JSON parser reads your input token by token, recognizing braces, colons, commas, and value types (strings, numbers, booleans, objects, arrays) to build an internal tree structure representing the data.
If a comma is missing, a bracket is unclosed, or a value is malformed, the parser points to the exact line and position of the error, making debugging fast. Once validated, the tool renders that tree back out as text with consistent indentation (typically 2 or 4 spaces), so nested objects and arrays are clearly separated across lines instead of running together.
This is a daily tool for developers reading API responses, debugging configuration files, or making sense of raw data coming back from a database. It also supports minifying JSON — stripping all unnecessary whitespace to shrink file size — which is useful for production code. All processing happens in the browser, so sensitive API payloads never leave your device.