JSON Formatter & Validator
Paste your JSON below to format, validate, and detect errors instantly.
About the JSON Formatter
The ToolNook JSON Formatter is a free, browser-based tool that lets you instantly format and beautify JSON data. Whether you've received a compressed API response or need to validate configuration files, this tool helps you read and debug JSON quickly.
Features
- Format and beautify JSON with 2-space, 4-space, or tab indentation
- Minify JSON by removing all whitespace
- Validate JSON and show precise error messages with line numbers
- One-click copy and download output
- Works entirely in your browser — no data sent to any server
Common Uses
JSON (JavaScript Object Notation) is the most widely used data format for APIs, configuration files, and data storage. The JSON Formatter is useful for developers debugging REST API responses, working with configuration files, or inspecting data from third-party services.