Free Online JSON Formatter & Validator

Instantly format, validate, and beautify your JSON data with this free online tool by WebEvra. Whether you are debugging API responses, working with configuration files, or cleaning up data, this JSON formatter makes your workflow faster and easier.

About This Tool

The WebEvra JSON Formatter is a developer-focused utility that runs entirely in your browser. No data is transmitted to any server, making it safe to use with sensitive or proprietary JSON. It supports pretty-printing with configurable indentation (2 or 4 spaces), one-click minification, real-time validation with precise error reporting including line numbers, JSON to YAML conversion, and an interactive tree view for exploring nested data structures.

Key Features

• Pretty Print JSON - Format JSON with 2-space or 4-space indentation for readability
• Minify JSON - Remove all whitespace to minimize file size for production
• Validate JSON - Get clear error messages with line numbers and descriptions
• JSON to YAML - Convert your JSON data to YAML format instantly
• Tree View - Explore nested structures with an interactive, collapsible tree
• File Upload - Drag and drop or upload .json files directly
• Privacy First - All processing happens client-side; your data never leaves your browser

Frequently Asked Questions

• What is JSON? ▼

  JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is based on a subset of JavaScript and is commonly used for APIs, configuration files, and data storage. JSON supports objects (key-value pairs), arrays, strings, numbers, booleans, and null values.

• What does a JSON formatter do? ▼

  A JSON formatter takes raw or minified JSON data and reformats it with proper indentation and line breaks, making it easier to read and understand. It can also minify JSON by removing all unnecessary whitespace to reduce file size for production use or API transmission.

• How do I validate JSON? ▼

  Paste your JSON into the input area and click the Validate button. The tool will parse your JSON and report whether it is valid. If there are syntax errors, it will show the approximate line number and a clear description of what went wrong, such as missing commas, unmatched brackets, or invalid syntax.

• Is my data safe when using this tool? ▼

  Yes. This JSON formatter runs entirely in your browser using client-side JavaScript. No data is sent to any server. Your JSON never leaves your device, making it completely safe to use with sensitive, private, or proprietary data.

• Can I convert JSON to YAML with this tool? ▼

  Yes. Click the YAML tab in the output panel to see your JSON data converted to YAML format. The conversion handles all standard JSON types including objects, arrays, nested structures, strings, numbers, booleans, and null values. The YAML output can be copied to your clipboard with the Copy button.