Free JSON Formatter - Beautify & Validate JSON Online

JSON Formatter prettifies compact or minified JSON into properly indented, human-readable code - and validates the syntax in the same step. Paste any API response, configuration file, or JSON string, and the formatter instantly renders a structured view with indented keys and values.

API responses, webhook payloads, and database exports often arrive as single-line compact JSON - no whitespace, no line breaks. Debugging these without formatting is slow and error-prone. The formatter converts to 2-space, 4-space, or tab indentation, matching your project's code style or what your IDE expects.

Validation catches every class of JSON syntax error: missing commas between fields, trailing commas after the last element (invalid in JSON, unlike JavaScript), unquoted property names, single-quoted strings, mismatched brackets, and malformed Unicode escape sequences. The error message pinpoints the exact line and column so you can fix the problem immediately.

The minify direction works in reverse - paste formatted JSON and collapse it to a compact single-line string for use in API request bodies, environment variables, or any context where whitespace wastes bandwidth or breaks parsing.

Parsing runs locally using the browser's native JSON engine. No data leaves your device - safe for debugging API responses that contain authentication tokens, personal data, or proprietary business logic.