Convert Javascript Object to JSON Online - justinbrowser.com
Convert JavaScript objects to properly formatted JSON with syntax validation and error handling
JavaScript Input
JSON Output
Converted JSON will appear here...
How to Use
Supported JavaScript Formats:
- • Object literals:
{key: 'value'} - • Arrays:
[1, 2, 3] - • Nested structures
- • String, number, boolean values
Features:
- • Real-time conversion
- • Syntax validation
- • Pretty formatting (2-space indentation)
- • Copy to clipboard & download
Free JavaScript to JSON Converter - JS Object to JSON Online Tool
Convert JavaScript objects and arrays into valid JSON format with our free online JS to JSON converter. Perfect for transforming JavaScript code snippets into JSON-compliant data structures with proper string formatting. Essential for API development, data migration, and Node.js object conversion with advanced validation and error handling.
Advanced JavaScript Object to JSON Conversion Features
Smart Quote Handling
Single & double quote conversion
- Automatically converts single quotes to double quotes
- Handles mixed quote scenarios in complex objects
- Escapes special characters properly for JSON compliance
Property Shorthand Conversion
ES6+ JavaScript features support
- Converts ES6 shorthand properties to full JSON syntax
- Handles computed property names and dynamic keys
- Preserves nested object structures and arrays
Comprehensive JavaScript Data Type Processing
Undefined Values
Handles undefined properties with null conversion or removal options
Function Values
Processes function values and converts to string representations
Date Objects
Converts Date objects to ISO string format for JSON compatibility
Essential Use Cases for JavaScript to JSON Conversion
API Payload Preparation
Convert JavaScript objects to proper JSON format for REST API requests, GraphQL mutations, and webhook payloads with guaranteed compatibility
Configuration File Conversion
Transform JavaScript config objects to JSON format for package.json, settings files, and environment configurations
Data Migration Tasks
Convert legacy JavaScript data structures to JSON for database imports, data exports, and cross-platform data transfer
Debug Output Formatting
Format console.log output, debugging objects, and development data into readable JSON for analysis and sharing
Documentation Generation
Create JSON examples from JavaScript code for API documentation, tutorials, and technical specifications
Node.js Object Processing
Convert Node.js runtime objects, Express.js request data, and server-side JavaScript objects to JSON format
JSON Validation & Quality Assurance Features
Real-Time JSON Validation
- Validates JSON syntax and structure in real-time
- Detects circular references and infinite loops
- Highlights syntax errors with detailed messages
- Tests output compatibility with JSON.parse()
Advanced Processing Options
- Pretty-print formatting with customizable indentation
- Minified output option for production use
- Preserves nested structures and complex hierarchies
- Handles large objects with performance optimization
JavaScript to JSON Conversion Best Practices & Pro Tips
1Handle Date Objects Properly
Use toISOString() for Date objects to ensure consistent JSON serialization across different timezones and environments. Our converter automatically handles Date conversion.
2Validate with JSON.parse()
Always test your converted JSON with JSON.parse() to ensure validity. Our tool provides built-in validation but manual testing ensures compatibility with your specific use case.
3Check for Circular References
Be aware of circular references in complex objects. Our converter detects these issues and provides warnings to prevent JSON.stringify() errors in production.
4Node.js Object Conversion
Perfect for converting Express.js request objects, database results, and server-side JavaScript data to JSON for API responses and data persistence.
5Handle Undefined Values Strategically
Choose whether to convert undefined values to null or remove them entirely based on your API requirements and data consumer expectations.
6Optimize for Performance
For large objects, use streaming or chunked processing. Consider minifying JSON output for production APIs to reduce payload size and improve transfer speed.
Pro Tip for API Developers
Use our JS to JSON converter for rapid prototyping of API payloads. Convert your JavaScript mock data to proper JSON format, then use it for testing, documentation, and frontend development. This ensures consistency between your development objects and production API responses.