JSON Formatter & Validator
Paste your JSON data below to format, validate, and beautify it
No JSON validated yet. Click "Validate JSON" to check your data.
How to Use This JSON Formatter
Step-by-Step Guide
Paste Your JSON
Copy and paste your JSON data into the input box. You can also use the sample button to load example JSON.
Choose Formatting Options
Select your preferred indentation (spaces or tabs) and choose whether to sort keys alphabetically.
Format or Validate
Click "Format JSON" to beautify, "Minify" to compress, or "Validate" to check for errors.
Copy or Download
Use the copy button to copy formatted JSON to clipboard or download as a .json file.
Common Use Cases
API Development
Format API responses for better readability during development and debugging.
Debugging JSON
Find and fix syntax errors in JSON data with detailed error messages.
Data Analysis
Analyze JSON structure with statistics about depth, keys, arrays, and objects.
Data Transformation
Convert between formatted and minified JSON for different use cases.
JSON Examples
Valid JSON Example
{
"user": {
"id": 12345,
"name": "John Doe",
"email": "[email protected]",
"preferences": {
"theme": "dark",
"notifications": true
},
"hobbies": ["reading", "gaming", "hiking"]
}
}Invalid JSON Example
{
name: "John Doe", // Missing quotes
"age": 30,
"city": "New York", // Trailing comma
"hobbies": ["reading", "gaming", "hiking",]
}Common errors: Missing quotes, trailing commas, incorrect syntax
Frequently Asked Questions
Your JSON data is 100% secure because all processing happens locally in your browser. No data is sent to our servers or any third-party services. This means:
- Complete privacy: Your JSON never leaves your computer
- Faster processing: No network delays for formatting
- Security: Sensitive API keys or data remain on your device
Formatting (Beautifying)
- • Adds indentation and line breaks
- • Makes JSON human-readable
- • Increases file size
- • Used for development and debugging
- • Example: 2-8 spaces or tabs for indentation
Minifying (Compressing)
- • Removes all unnecessary whitespace
- • Makes JSON machine-optimized
- • Reduces file size by 60-80%
- • Used for production and APIs
- • Example: {"key":"value"} (single line)
Tip: Use formatted JSON during development for readability, and minified JSON in production for better performance.
| Error Type | Example | Solution |
|---|---|---|
| Missing Quotes | {name: "John"} | Add quotes: {"name": "John"} |
| Trailing Comma | {"a": 1, "b": 2,} | Remove last comma: {"a": 1, "b": 2} |
| Single Quotes | {'key': 'value'} | Use double quotes: {"key": "value"} |
| Comments | {"key": "value"} // comment | Remove comments (JSON doesn't support them) |
| Undefined/NaN | {"value": undefined} | Use null: {"value": null} |
Pro Tip: Our "Try to Fix" button automatically corrects many common errors like trailing commas and missing quotes.
There's no hard limit, but for optimal performance:
Recommendations:
- For JSON larger than 5MB, consider breaking it into smaller chunks
- Very large JSON files (50MB+) may cause browser performance issues
- Our tool handles typical API responses (1KB-1MB) perfectly
Our tool supports both JSON objects and arrays. Here are examples of valid inputs:
JSON Object
{
"users": [
{"id": 1, "name": "Alice"},
{"id": 2, "name": "Bob"}
],
"total": 2
}JSON Array
[
{"id": 1, "name": "Alice"},
{"id": 2, "name": "Bob"},
{"id": 3, "name": "Charlie"}
]Note: A valid JSON document can be either:
-
An object:
{...} -
An array:
[...] - A string, number, boolean, or null value
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