JavaScript Object to JSON Converter
Convert messy JavaScript object literals into clean, valid JSON instantly. Handles single quotes, trailing commas, comments, and JS-only values all in your browser.
How It Works
Paste Your Object
Paste a JavaScript object literal into the input editor. Supports messy syntax single quotes, trailing commas, comments, and more.
See Live JSON
Conversion happens automatically as you type. No button to click your valid JSON appears instantly in the output panel.
Copy & Use
Copy the valid JSON to your clipboard or download it as a .json file. Ready for APIs, configs, and data files.
Why Use This Tool
Handles Quirky Syntax
Single quotes, trailing commas, unquoted keys, inline comments all cleaned up automatically.
Strips Invalid Values
Functions, undefined, Infinity, NaN, and other JS-only values are removed or converted to JSON-safe equivalents.
Instant Results
No server calls needed. Runs 100% in your browser with live conversion as you type.
Configurable Output
Choose indentation style, decide how to handle undefined values, and optionally sort keys alphabetically.
Supported Transformations
FAQ
What JavaScript syntax does this handle?
This tool handles single-quoted strings, unquoted property keys, trailing commas, single-line and multi-line comments, undefined values, function values, template literals, Infinity, NaN, new Date() expressions, and RegExp literals.
Is my code sent to a server?
No. All conversion happens entirely in your browser. Your code never leaves your machine there are no API calls or server-side processing.
What happens to functions and undefined?
Function values (including arrow functions) are always removed since they have no JSON equivalent. For undefined values, you can choose to either remove the key entirely or convert it to null.
How does it handle special values like Infinity?
Infinity, -Infinity, and NaN are converted to null since they are not valid JSON. new Date() expressions are converted to ISO 8601 strings when possible. RegExp literals are converted to their string representation.
Can I convert JSON back to a JS object?
JSON is already valid JavaScript, so you can use it directly. If you need to add JS-specific features like comments or functions, you would need to edit the output manually.
Related Tools
Check out these other free developer converter tools from SnipShift: