How do I copy a cURL command from Chrome or Firefox DevTools?

Open your browser Developer Tools (F12 or right-click > Inspect), switch to the Network tab, and perform your web action. Locate the target API request in the list, right-click on it, select Copy, and click "Copy as cURL" (or "Copy as cURL (bash)"). Paste that exact string directly into our converter.

Why does my converted Python or Fetch script fail when the original cURL succeeds?

Common discrepancies include: (1) Missing User-Agent headers, which some cloud firewalls (like Cloudflare) block if omitted; (2) Escaped quotation marks inside nested JSON strings; and (3) Content-Type mismatches. Our converter automatically normalizes headers and validates JSON structures to eliminate these differences.

Does this converter support multiline cURL commands with backslashes?

Yes. Our parser recognizes bash and terminal line continuation characters (backslash followed by a line break), trims trailing spaces, and reconstructs the full command cleanly in memory before code generation.

Are my private API keys or bearer tokens sent to any external server?

No. The conversion logic runs 100% locally in your web browser using client-side JavaScript. Your confidential bearer tokens, client secrets, proprietary endpoints, and JSON payloads never leave your computer.

Which programming language output is recommended for production web applications?

For browser frontends and modern Node.js 18+ services, native Fetch is recommended because it requires zero external dependencies. For Python backends, requests or httpx are standard, while Go net/http provides maximum raw performance and concurrency.

Free cURL to Code Converter - Convert cURL to Fetch, Python & Axios

How to Convert cURL Commands to Application Code

cURL commands are the universal standard for sharing API requests in developer documentation, troubleshooting discussions, and terminal workflows. When testing an endpoint in Google Chrome, Firefox, or Postman, copying the request as a cURL string is the fastest way to capture all request components, including query parameters, custom HTTP headers, authorization tokens, and request bodies.

Translating that shell syntax into production code for JavaScript Fetch, Axios, Python Requests, or Go manually introduces syntax mistakes: escaping nested JSON strings, forgetting header capitalization, or mishandling Basic Auth credentials. Our converter parses the command into an abstract syntax tree and rebuilds the request using modern idioms for your target runtime.

Supported cURL Flags and Syntax Variations

This converter evaluates shell flags following POSIX standards, handling multiline commands separated by backslashes as well as inline arguments:

Flag	Long Variant	Purpose & Conversion Behavior
-X	--request	Specifies HTTP request method (GET, POST, PUT, PATCH, DELETE, OPTIONS).
-H	--header	Parses key-value headers into language-specific dictionaries or maps.
-d	--data, --data-raw	Sends POST data. Auto-formats JSON payloads or passes string bodies.
-u	--user	Decodes user:password and translates into Authorization: Basic Base64 headers.
-b	--cookie	Appends session cookies directly into Cookie request headers.

Practical Worked Example: Converting an Authenticated REST API Request

Consider a typical scenario where you inspect a payment verification webhook or AI completion query copied from documentation:

curl -X POST https://api.openai.com/v1/chat/completions \ -H "Content-Type: application/json" \ -H "Authorization: Bearer sk-live-example12345" \ -d '{"model": "gpt-4o", "messages": [{"role": "user", "content": "Hello"}]}'

When converted to JavaScript Fetch, our tool recognizes the application/json header, preserves bearer token headers, and packages the payload into an idiomatic async function with error handling:

async function makeRequest() { const url = 'https://api.openai.com/v1/chat/completions'; const options = { method: 'POST', headers: { 'Content-Type': 'application/json', 'Authorization': 'Bearer sk-live-example12345' }, body: JSON.stringify({ model: 'gpt-4o', messages: [{ role: 'user', content: 'Hello' }] }) }; try { const response = await fetch(url, options); if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`); const result = await response.json(); return result; } catch (error) { console.error('Fetch request failed:', error); throw error; } }

Handling Complex Payloads: Form-Data, JSON, and URL-Encoded Parameters

When dealing with APIs, request bodies often arrive in different encodings. If your endpoint requires URL-encoded data (such as OAuth 2.0 token exchanges using grant_type=client_credentials), cURL sends raw strings. In Python, these should map to data=payload, whereas structured JSON objects map to json=payload so the runtime handles content negotiation headers cleanly.

If you are working with large JSON payloads or schema definitions, pair this tool with our free client-side JSON formatter to validate syntax before triggering requests.

Security & Zero-Server Privacy: Why Browser-Side Execution Matters

API requests copied from developer consoles frequently contain sensitive operational data: live API keys, JWT authentication tokens, customer email addresses, and internal microservice URLs.

Many online converter tools transmit your copied commands to an external backend server for processing. This creates data security risks and potential compliance violations under SOC2, HIPAA, and GDPR. AptoCompass executes all lexing, tokenization, and string generation strictly in your browser using client-side JavaScript. Your confidential headers and tokens never leave your local environment.

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