{ }

JSON Formatter & Validator

Web Tools

Format, validate, and minify JSON data with syntax highlighting.

Indent

Auto

Input

0 lines0 B

{
  "key": "value"
}

Output

{ }

Formatted output will appear here

How to Format JSON Online

Paste Your JSON

Paste raw or minified JSON into the input editor. The VS Code-style editor provides syntax highlighting, auto-indentation, and bracket matching as you type.

Format, Minify, or Validate

Click Format to pretty-print with your preferred indentation (2 or 4 spaces). Use Minify to compress for production, or switch to Validate mode to check for errors.

Copy or Explore

Copy the formatted output with one click. Switch to Tree View to navigate deeply nested structures with collapsible nodes and color-coded values.

Features

Syntax Highlighting

VS Code-inspired color scheme — keys, strings, numbers, booleans, and brackets are each uniquely colored for instant readability.

Real-Time Validation

Errors are detected as you type with precise line and column numbers, so you can fix typos before they reach production.

Smart Editor

Auto-close quotes and brackets, smart indentation on Enter, and Tab key support — just like your favorite code editor.

Collapsible Tree View

Explore complex JSON hierarchies with expandable nodes. Quickly drill into nested objects and arrays without scrolling through raw text.

Format & Minify

Pretty-print with 2 or 4 space indentation, or minify to a single line for smaller payloads and faster network transfers.

100% Client-Side

All processing happens in your browser. Your data never leaves your device — no server uploads, no tracking, no cookies.

What is JSON?

JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is the most widely used format for transmitting data between a server and a web application, and is the default format for REST APIs, configuration files, and NoSQL databases like MongoDB and CouchDB.

JSON supports six data types: strings, numbers, booleans (true/false), null, objects (key-value pairs enclosed in curly braces), and arrays (ordered lists enclosed in square brackets). Unlike XML, JSON has no closing tags, no attributes, and no namespaces — making it significantly more compact and faster to parse.

Common use cases include API responses, application configuration (package.json, tsconfig.json), browser localStorage, log aggregation, and data pipelines. A JSON formatter helps developers quickly inspect, debug, and clean up JSON data during development and testing workflows.

Frequently Asked Questions

What is a JSON formatter?

A JSON formatter is a tool that takes raw or minified JSON data and reformats it with proper indentation and line breaks, making it easy to read and debug. Our formatter also validates your JSON and highlights syntax errors with exact line and column numbers.

Is this JSON formatter free to use?

Yes, completely free with no limits. There is no signup, no account required, and no restrictions on how much JSON you can format. The tool runs entirely in your browser — your data is never sent to any server.

Can I validate JSON with this tool?

Absolutely. Switch to the Validate tab to check whether your JSON is valid. The validator reports the exact error location (line and column), the data type (object, array, string, etc.), and the number of keys or items.

What is the difference between JSON formatting and minifying?

Formatting (also called beautifying or pretty-printing) adds indentation and line breaks so JSON is human-readable. Minifying removes all unnecessary whitespace to reduce file size, which is useful for production APIs and network payloads.

Does this tool work with large JSON files?

Yes. The formatter handles large JSON documents efficiently because all processing happens client-side using native JavaScript JSON.parse and JSON.stringify. There is no file-size limit imposed by a server since nothing is uploaded.

What is the JSON tree view?

The tree view renders your JSON as a collapsible, hierarchical structure — similar to a file explorer. You can expand and collapse objects and arrays to navigate deeply nested data. Keys, strings, numbers, booleans, and null values are color-coded for quick scanning.

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About JSON Formatter & Validator

Instantly format, validate, and beautify your JSON data with our free online JSON formatter and validator. Detect syntax errors in real time, minify JSON for production, and explore nested structures with collapsible tree view. Perfect for developers working with APIs, configuration files, and data pipelines.

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