JSON Formatter & Validator
Format, minify and validate JSON data structure.
Why format and validate JSON
JSON (JavaScript Object Notation) is the standard format for exchanging data between server and client. Formatting adds indentation and line breaks so the structure is easy to read, while the validator immediately shows where a syntax error is — an extra comma, an unclosed bracket or quote.
{"a":1,"b":[1,2,3]} → { "a": 1, "b": [1, 2, 3] }
The “Minify” button does the opposite: it removes all whitespace and line breaks to produce a compact string for passing to an API or embedding in code. All processing happens entirely in your browser.
This material is for reference only.
FAQ about working with JSON
Why does my JSON show a syntax error?
The most common causes are a trailing comma before a closing bracket, unclosed quotes around a key or value, or using single quotes instead of double quotes. The validator points to roughly where the error is.
What's the difference between formatting and minifying?
Formatting adds indentation and line breaks for readability during development. Minifying strips out unnecessary characters to reduce file size — useful for production and data transfer.
Is my data sent to a server?
No. JSON formatting and validation happen entirely on your device in the browser — the text you enter is never sent anywhere or stored.
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