Free JSON Formatter Online
Format, beautify, validate, and minify JSON data instantly. Supports tree view, syntax highlighting, and validation.
Key Features
💡 Syntax Highlighting
Color-coded JSON for better readability and error detection.
✅ Validation
Instant validation with detailed error messages and line numbers.
⚡ Fast Processing
All operations run locally in your browser for instant results.
🔒 Privacy Protected
Your data never leaves your browser. No server storage.
Frequently Asked Questions
Getting Started
What is a JSON formatter?
A JSON formatter helps developers beautify and validate JSON data for better readability and debugging. It transforms minified JSON into a structured, human-readable format with proper indentation.
Is this JSON formatter free?
Yes. All tools are completely free and run locally in your browser. No signup, no limits, no hidden costs.
Does the tool store my data?
No. Your JSON data never leaves your browser. All processing happens locally on your device, ensuring complete privacy and security.
Features & Usage
How do I format JSON?
Simply paste your JSON into the input area and click the "Format" button. The tool will automatically add proper indentation and line breaks. You can also switch to "Tree View" for a navigable hierarchy.
What is JSON minification?
Minification removes all unnecessary whitespace and line breaks from JSON, creating a compact single-line format ideal for production environments and network transmission.
How does the tree view work?
The tree view displays your JSON as an interactive, collapsible hierarchy. Click on arrows or keys to expand/collapse nodes. Use "Expand All" or "Collapse All" for quick navigation of large structures.
Can I validate my JSON?
Yes! Click the "Validate" tab to check your JSON for syntax errors. The validator shows exact line numbers, character positions, and detailed error descriptions to help you fix issues quickly.
Examples
Example: Format a simple object
Input (Minified):
{"name":"John","age":30,"city":"New York"}
Output (Formatted):
{
"name": "John",
"age": 30,
"city": "New York"
}
Example: Nested object structure
Input:
{"user":{"id":1,"profile":{"name":"Jane","email":"jane@example.com"}},"status":"active"}
Formatted Output:
{
"user": {
"id": 1,
"profile": {
"name": "Jane",
"email": "jane@example.com"
}
},
"status": "active"
}
Example: Array of objects
Input:
[{"id":1,"name":"Product A"},{"id":2,"name":"Product B"}]
Formatted Output:
[
{
"id": 1,
"name": "Product A"
},
{
"id": 2,
"name": "Product B"
}
]
Troubleshooting
What if my JSON has errors?
The validator will highlight the exact line and position of any syntax errors. Common errors include missing quotes around keys, trailing commas, or unescaped special characters.
Why is my JSON showing as invalid?
Common issues include: unquoted keys (JavaScript objects are not JSON), single quotes instead of double quotes, trailing commas in arrays/objects, and unescaped newlines or tabs in strings.
Can I use this tool offline?
Yes! Once you've visited the page, all functionality works offline thanks to service workers and local processing.