JSON Formatter & Beautifier

A JSON formatter — also called a JSON beautifier or JSON pretty-printer — takes raw, minified, or single-line JSON and reformats it with clean indentation and line breaks so you can actually read it. If you have ever stared at a wall of nested braces from an API response or a log file and wished for some whitespace, this is the tool you need.

JSON (JavaScript Object Notation) is the default data format of the modern web. REST APIs, GraphQL responses, configuration files (package.json, tsconfig.json), NoSQL database exports, browser localStorage, and inter-service messages all use JSON. In production, JSON is usually minified — all whitespace stripped — to reduce payload size. That is great for machines but unreadable for humans.

This formatter parses your JSON, detects syntax errors, and re-serializes it with your choice of indentation: 2 spaces, 4 spaces, or tabs. It preserves all data values, key ordering, and structure exactly as they are — only whitespace changes. You can copy the result to your clipboard or download it as a .json file. Everything runs in your browser via JavaScript's native JSON.parse and JSON.stringify; your data never leaves your machine.

For related tasks, see the JSON Validator (checks syntax without reformatting), JSON Viewer (interactive collapsible tree), and the converters JSON → YAML and JSON → CSV — all linked below.