{}

JSON Formatter & Validator

Paste any JSON to format, validate, or minify it instantly. Errors show line and column numbers. Everything runs in your browser - nothing is sent to a server.

FREE VALIDATE FORMAT MINIFY
Valid JSON
JSON Parse Error

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write, and easy for machines to parse and generate.

JSON is built on two structures:

  • • Objects - a collection of key/value pairs wrapped in { }
  • • Arrays - an ordered list of values wrapped in [ ]

Valid value types: string, number, object, array, true, false, null.

Common JSON Errors

Trailing commas
{"a": 1,}  ← not allowed
Unquoted keys
{key: "value"}  ← keys must be quoted
Single quotes
{'key': 'val'}  ← use double quotes
Missing commas
{"a":1 "b":2}  ← comma between pairs

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