Paste a JavaScript object to see JSON output
This free JavaScript to JSON converter helps you transform JavaScript object literals into valid JSON format. All processing happens in your browser - your code never leaves your computer. Perfect for converting API payloads, configuration objects, or any JavaScript data to JSON.
The converter transforms JavaScript syntax to valid JSON:
JavaScript Input:
{
userId: "user123",
isActive: true,
items: ['a', 'b']
}
JSON Output:
{
"userId": "user123",
"isActive": true,
"items": ["a", "b"]
}
Instant Conversion
Convert JavaScript objects to valid JSON in real-time
Auto Format
Automatically quotes keys, removes trailing commas, fixes quotes
Copy & Download
Easily copy or download your converted JSON
Syntax Validation
Get instant feedback if your JavaScript has syntax errors
How do I convert JavaScript to JSON?
Paste your JavaScript object literal into the input field. The tool will automatically convert it to valid JSON with proper double quotes, no trailing commas, and correct formatting.
What gets converted in the JS to JSON process?
The converter handles: unquoted keys become quoted, single quotes become double quotes, trailing commas are removed, and property values are properly serialized.
Is this JavaScript to JSON converter free?
Yes, this converter is completely free to use with no signup required. All processing happens in your browser.
Is my code data secure?
Yes, your code never leaves your browser. All conversion happens locally on your device.
Privacy First
All conversion happens in your browser. Your code never leaves your device or gets uploaded to any server.
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