JSON Formatter & Validator
Paste JSON to format, validate, or minify it instantly.
Frequently Asked Questions
What is JSON?▼
JSON (JavaScript Object Notation) is a lightweight data interchange format. It uses key-value pairs and arrays to structure data. It is human-readable and widely used for APIs, config files, and data storage.
What causes JSON syntax errors?▼
Common errors include: missing quotes around keys, trailing commas after the last item, using single quotes instead of double quotes, undefined or NaN values (not valid JSON), and unescaped special characters in strings.
What is the difference between JSON and JavaScript objects?▼
JSON is a text format based on JavaScript object syntax, but with stricter rules. JSON keys must be double-quoted strings. Values cannot be functions, undefined, or dates. JSON is a subset of valid JavaScript but not the same as a JS object.
How do I minify JSON?▼
Minifying JSON removes all whitespace (spaces, newlines, indentation) that is not inside string values. This reduces file size for transmission over networks. The data is identical — only formatting is removed.