How to Convert a cURL Command to Python, JS, or Node

API documentation almost always shows example requests as cURL commands, but using that API in your own application means translating the command into your language's HTTP client syntax. This guide walks through that conversion by hand, then shows how a converter tool handles the same process automatically.

What You Need

• A cURL command, copied from API documentation or your browser's Network tab
• A target language in mind (Python, JavaScript, or Node.js)
• The relevant HTTP library installed if you're using Python's requests or Node's axios

The cURL to Code Converter automates every step below. Paste your command, pick a language, and get working code instantly.

Step 1: Identify the URL and Method

Find the URL in your cURL command. It's usually the only argument without a leading dash. Check for an explicit -X or --request flag specifying the HTTP method. If there isn't one, cURL defaults to GET unless a -d or --data flag is present, in which case it defaults to POST instead.

Example cURL command:

curl -X POST https://api.example.com/users \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -d '{"name": "Asha", "role": "admin"}'

Here, the method is explicitly POST and the URL is https://api.example.com/users.

Step 2: Extract All Headers

List every -H or --header flag and split each on the first colon to get the header name and value separately. In the example above, there are two headers: Content-Type: application/json and Authorization: Bearer YOUR_TOKEN.

Step 3: Extract the Request Body

Find any -d, --data, or --data-raw flag. That's your request body. In the example, the body is {"name": "Asha", "role": "admin"}, a JSON string.

Step 4: Write the Python Version

import requests

url = 'https://api.example.com/users'
headers = {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer YOUR_TOKEN',
}
data = '{"name": "Asha", "role": "admin"}'

response = requests.request('POST', url, headers=headers, data=data)
print(response.status_code)
print(response.text)

Step 5: Write the JavaScript Version

fetch('https://api.example.com/users', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer YOUR_TOKEN',
  },
  body: '{"name": "Asha", "role": "admin"}',
})
  .then((res) => res.text())
  .then((text) => console.log(text))
  .catch((err) => console.error(err));

Step 6: Write the Node.js (axios) Version

const axios = require('axios');

axios({
  method: 'post',
  url: 'https://api.example.com/users',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer YOUR_TOKEN',
  },
  data: '{"name": "Asha", "role": "admin"}',
})
  .then((res) => console.log(res.data))
  .catch((err) => console.error(err));

Step 7: Replace Credentials Before Sharing

If your original command included a real API key or token (as in YOUR_TOKEN above), swap it for an environment variable reference before committing the converted code to version control or sharing it with teammates.

Common Mistakes to Avoid

Forgetting the default method change. A cURL command with -d but no -X defaults to POST, not GET. Make sure your converted code matches that.

Mishandling multi-line commands. Trailing backslashes mean the command continues on the next line. Don't treat each line as separate.

Leaving real credentials in shared code. Scrub API keys and tokens before committing or sharing converted code, every time, not just when you remember.

Missing quoted string escaping. JSON bodies inside single-quoted shell strings can contain escaped characters, and those need careful handling when you reconstruct the string in your target language.

Key Terms

• cURL: a command-line tool for making HTTP requests, commonly used in API documentation to show example requests.
• JSON: the data format most commonly used for API request and response bodies.
• REST API: a web service architecture style using standard HTTP methods (GET, POST, PUT, DELETE) for resource operations.