JSON Formatter & Validator

What Is a JSON Formatter?

This free JSON formatter and validator instantly formats, beautifies, minifies, and validates any JSON data — entirely in your browser. Whether you are a developer debugging an API response, a data analyst inspecting a JSON file, or a student learning JSON syntax, this JSON formatter gives you clean, readable output in one click.

JSON (JavaScript Object Notation) is the most widely used data format for APIs, web applications, configuration files, and data exchange. In fact, virtually every web API returns JSON. This JSON formatter makes working with JSON fast and error-free — no server, no login, no data sent anywhere.

What Can This JSON Formatter Do?

• Format / Beautify: Takes minified or messy JSON and outputs clean, indented, human-readable JSON with proper line breaks. Choose 2-space, 4-space, or tab indentation.
• Minify: Removes all whitespace and line breaks to produce the smallest possible JSON string — useful for APIs and storage optimization.
• Validate: Checks whether your JSON is syntactically valid. If invalid, this JSON formatter shows the exact error message including the location of the problem.
• Statistics: Shows key count, array count, nesting depth, total characters, and minified size — useful for understanding the structure of large JSON objects.

How to Use This JSON Formatter

1. Paste your JSON into the Input field — validation happens automatically as you type.
2. Click Format / Beautify to see clean, indented output in the right panel.
3. Click Minify to compress JSON to a single line for API use or storage.
4. Click Validate Only for a quick check without modifying the output.
5. Copy output using the Copy button above the output panel.

JSON Syntax Checks This Formatter Can Help You Fix

Valid JSON is stricter than a JavaScript object literal. Property names and text values need double quotes, arrays and objects cannot have trailing commas, and JSON does not support comments, undefined, or NaN. When a pasted API response fails validation, start at the reported line and inspect the character immediately before it; a missing comma or an unmatched bracket often causes the parser to report the next line rather than the original mistake. Formatting makes nesting easier to inspect, while minifying removes whitespace only after the data is valid. This tool checks syntax and displays structure statistics; it does not verify that a JSON document follows a particular API schema or that its values are semantically correct.

JSON Formatter — Frequently Asked Questions