Format Tools

JSON Formatter and Validator

Format, validate, minify, and inspect JSON with parse errors that point to the problem.

Paste JSON to format it with stable indentation and verify that it parses as standard JSON.

Common edge cases

JavaScript object syntax is not always valid JSON. Keys must be quoted and comments are not allowed.

const formatted = JSON.stringify(JSON.parse(input), null, 2);

Does this validate JSON5?

No. It validates standard JSON.

JWT Decoder Decode JWT headers and payloads without validating the token signature. Text Diff Checker Compare two text blocks with side-by-side line changes and word-level highlights.