What cURL options and syntax does the converter support?

The converter supports all common cURL options including: -X for HTTP methods (GET, POST, PUT, DELETE, etc.), -H for headers, -d for data payloads, -u for basic authentication, --url for specifying URLs, and complex combinations of these options. It handles quoted strings, JSON data, form data, and authentication headers. The tool recognizes standard HTTP headers like Content-Type, Accept, Authorization, and User-Agent, and can handle both simple key-value pairs and complex nested JSON structures.

How does the converter handle authentication and security headers?

The converter preserves all authentication headers exactly as specified in your cURL command, including Bearer tokens, API keys, Basic authentication credentials, and custom security headers. It maintains the header structure and formatting while converting the request syntax. For Bearer tokens, the converter ensures proper header formatting. For Basic auth, it maintains the Authorization header structure. All sensitive information in headers is preserved without modification to ensure secure API integration.

Can the converter handle complex JSON data and nested objects?

Yes, the converter intelligently handles complex JSON data structures including nested objects, arrays, and mixed data types. When it detects JSON content (via Content-Type headers or data format), it automatically formats the JSON payload in the generated Fetch code with proper indentation and syntax. The tool validates JSON syntax and provides error handling for malformed data. It supports both pre-formatted JSON and URL-encoded form data, automatically determining the appropriate request body format and Content-Type headers.

What error handling and best practices are included in generated code?

The generated Fetch code includes comprehensive error handling with try-catch blocks, HTTP status validation using response.ok, and proper rejection handling. It includes console logging for both success and error scenarios, network error handling, and response validation. The code follows modern JavaScript async/await patterns with proper promise chain management. Error messages include HTTP status codes for debugging, and the code gracefully handles network timeouts, server errors, and malformed responses.

How does the converter determine response handling (JSON vs text)?

The converter automatically determines the appropriate response handling by analyzing Accept headers in the original cURL command. If it detects 'Accept: application/json' or similar JSON content types, it generates code that calls response.json(). For other content types or when no specific Accept header is present, it defaults to response.text(). This ensures the generated code correctly handles API responses based on the expected content type, preventing parsing errors and ensuring proper data handling in your applications.

Is the generated JavaScript code ready for production use?

Yes, the generated Fetch code is production-ready with proper error handling, response validation, and modern JavaScript syntax. However, you should review and customize the code for your specific application needs, including adding application-specific error handling, user interface integration, and business logic validation. The converter provides a solid foundation that follows JavaScript best practices, but you may want to add environment-specific configuration, authentication token management, and integration with your application's state management or API client libraries.

Can I customize the generated Fetch code output format?

The converter generates standardized Fetch API code with consistent formatting, error handling, and response handling patterns. While the output format follows established best practices, you can easily modify the generated code after conversion to match your team's coding standards, add additional headers, integrate with your application's API client, or customize the error handling and logging based on your specific requirements. The clean, readable output makes it easy to modify and extend the generated code.

Does the tool work with modern JavaScript frameworks and libraries?

Yes, the generated Fetch code is compatible with all modern JavaScript environments including React, Vue.js, Angular, Node.js, and vanilla JavaScript applications. The code uses standard Fetch API syntax that works in all modern browsers and can be easily integrated with popular frameworks and state management libraries. For framework-specific integrations, you can modify the generated code to use framework conventions like React hooks, Vue composition functions, or integrate with existing API service layers and HTTP client configurations.

cURL to Fetch Converter

Convert cURL commands to JavaScript Fetch API code instantly with proper error handling, JSON support, and authentication. Perfect for API integration, web development, and code migration with comprehensive parsing and format conversion.

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Quick Presets

Common cURL commands for quick conversion

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Paste your cURL command to convert to JavaScript Fetch API

How it works: Parses the cURL command to extract the HTTP method, URL, headers, and request body. Converts each cURL flag (-X, -H, -d, --data, etc.) to the equivalent JavaScript Fetch API syntax with proper async/await and error handling.

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