JSON Formatter & Validator

Free online JSON formatter, validator, and beautifier. Format JSON with syntax highlighting, precise error location, and tree view. 100% browser-based, no data upload.

Private Validate

JSON Input 0 characters

Formatted JSON 0 characters

Indent:

Sort keys

JSONPath Query:

Load from URL:

How to Use JSON Formatter

Paste Your JSON

Copy your JSON data and paste it into the input box. You can also click the upload button to load a .json file from your computer.

Choose Your Mode

Select Format to beautify your JSON with indentation, Minify to compress it, or Tree to view it as an expandable tree structure.

Fix Any Errors

If your JSON has syntax errors, the tool will highlight the exact line and show a detailed error message to help you fix it quickly.

Copy the Result

Click the copy button to copy the formatted JSON to your clipboard. The result is ready to use in your projects.

Tips for Best Results

Validate first - The tool automatically validates your JSON as you type, showing errors instantly
Use tree view - For complex JSON structures, switch to tree view to easily navigate and explore the data
Choose indentation - Select 2 spaces, 4 spaces, or tab indentation based on your project's style guide
Privacy guaranteed - All processing happens in your browser. Your JSON data never leaves your device

Frequently Asked Questions

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 syntax but is language-independent, making it ideal for APIs, configuration files, and data storage.

A JSON formatter makes your JSON readable by adding proper indentation and line breaks. A JSON validator checks if your JSON syntax is correct and identifies errors. Our tool does both simultaneously - it formats your JSON while validating it in real-time.

Common JSON errors include:

Missing commas - Elements in arrays and objects must be separated by commas
Unquoted property names - All property names must be in double quotes
Trailing commas - JSON does not allow commas after the last element
Single quotes - JSON requires double quotes, not single quotes
Missing brackets - Ensure all { } and [ ] are properly closed

Our tool highlights the exact location of errors to help you fix them quickly.

Our tool makes fixing JSON errors easy:

Paste your JSON into the input box
The tool will show an error message with the exact line number
Click on the error to jump to that line
Fix the syntax error (usually a missing comma, quote, or bracket)
The tool will automatically re-validate and show the formatted result

JSON is a data format that represents structured data. JSONP (JSON with Padding) is a technique for cross-domain requests that wraps JSON in a function call. JSONP is largely obsolete now due to CORS (Cross-Origin Resource Sharing) support in modern browsers.

Yes! Our tool has no file size limit. All processing happens in your browser using JavaScript, so you can format JSON files of any size. However, very large files (hundreds of megabytes) may slow down your browser due to memory constraints.

Absolutely! All processing happens entirely in your browser using JavaScript. Your JSON data is never sent to any server. You can even use this tool offline once the page is loaded. This makes it safe to use with sensitive data like API keys, passwords, or personal information.

JSON minification removes all unnecessary whitespace from JSON data, including spaces, line breaks, and indentation. This reduces file size, which is beneficial for:

Faster network transmission
Reduced bandwidth usage
Smaller file storage

Click the "Minify" button to compress your JSON instantly.

Understanding JSON Format

JSON (JavaScript Object Notation) is a text-based format for representing structured data. It has become the standard for APIs, configuration files, and data exchange due to its simplicity and wide support.

JSON Data Types

JSON supports 6 data types:

"string" Text in double quotes

123 Number (integer or float)

true / false Boolean values

null Empty/null value

{ } Object (key-value pairs)

[ ] Array (ordered list)

JSON Syntax Rules

Data is in name/value pairs - Each key is followed by a colon and its value
Data is separated by commas - Elements are separated by commas, but no trailing comma
Curly braces hold objects - { "key": "value" }
Square brackets hold arrays - [1, 2, 3]
Property names must be in double quotes - "name" not name

JSON Structure Example

{
  "name": "John Doe",
  "age": 30,
  "active": true,
  "skills": ["JavaScript", "Python", "JSON"],
  "address": {
    "city": "New York",
    "country": "USA"
  },
  "metadata": null
}

JSON vs XML Comparison

Feature	JSON	XML
Syntax	Simpler, cleaner	More verbose
File Size	Smaller	Larger
Parsing Speed	Faster	Slower
Data Types	Native support	Text only
Human Readable	Yes	Yes
Comments	Not supported	Supported

Why Use JSON?

Lightweight - Minimal overhead compared to XML
Easy to read - Simple structure that humans can understand
Language independent - Supported by virtually all programming languages
Fast parsing - Native JSON parsers in all modern browsers
API standard - The de facto standard for REST APIs

About JSON Formatter & Validator