JSON Formatter & Validator

JSON (JavaScript Object Notation) is the standard data format for APIs, configuration files, and data exchange. Raw JSON from APIs often arrives as a single line without whitespace, making it nearly impossible to read.

Formatting (or 'pretty-printing') adds indentation and line breaks to make the structure visible — nested objects, arrays, and key-value pairs become easy to scan. This is essential for debugging API responses and understanding data structures.

Our tool formats, validates, and minifies JSON in your browser. It highlights syntax errors with line numbers, supports large payloads, and lets you copy the formatted output with one click.