JSON Formatter & Validator
Free online JSON formatter, validator, and beautifier. Format JSON with syntax highlighting, precise error location, tree view, and JSONPath query. 100% browser-based, no data upload.
How to Use JSON Formatter
Paste or Load JSON
Copy your JSON data and paste it into the input box, click the upload button to load a .json file, or enter a URL to fetch JSON directly from an API endpoint.
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.
Query with JSONPath
Use JSONPath expressions to extract specific data from your JSON. For example, $.store.book[0].title gets the first book title.
Fix Errors & Copy
If your JSON has syntax errors, the tool will highlight the exact line. Fix the errors and click the copy button to copy the result to your clipboard.
Tips for Best Results
- Validate first - The tool automatically validates your JSON as you type, showing errors instantly with line and column numbers
- Use tree view - For complex JSON structures, switch to tree view to easily navigate and explore the data
- Query with JSONPath - Use JSONPath expressions like
$.data[*].nameto extract specific values from large JSON files - Load from URL - Paste an API endpoint URL to directly fetch and format JSON data without manual copying
- 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.
JSONPath is a query language for JSON, similar to XPath for XML. It allows you to extract specific data from complex JSON structures.
Common JSONPath expressions:
$- Root object$.name- Access property "name"$.store.book[0]- First item in "book" array$.data[*].title- All "title" properties in "data" array
Enter your JSONPath query in the "JSONPath Query" field and click "Query" to extract data.
Yes! You can load JSON directly from any URL:
- Enter the URL in the "Load from URL" field (e.g., https://api.example.com/data.json)
- Click the "Load" button
- The tool will fetch and automatically format the JSON
Note: The URL must support CORS (Cross-Origin Resource Sharing) for browser access. Public APIs and JSON files hosted on GitHub Raw, JSONPlaceholder, or similar services typically work well.
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"notname
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
Free online JSON formatter, validator, and beautifier. Format JSON with syntax highlighting, precise error location, tree view, and JSONPath query. 100% browser-based, no data upload.