How to Convert cURL Commands to Python, JavaScript Fetch & Golang Code

cURL is the universal lingua franca for inspecting and testing HTTP APIs in command line environments, Postman, and API documentation. However, when transitioning from terminal testing to production code, hand-crafting HTTP request headers, query parameters, authentication tokens, and request bodies in programming languages like Python or JavaScript can introduce syntax bugs and escaped string errors.

Understanding cURL Flags & Syntax Anatomy

A typical cURL command contains multiple flags that represent different parts of an HTTP request:

• -X or --request: Specifies the HTTP verb (GET, POST, PUT, DELETE, PATCH).
• -H or --header: Passes custom request headers like Authorization: Bearer token or Content-Type: application/json.
• -d or --data: Attaches the raw string or JSON payload sent to the server.
• -u or --user: Formats Basic HTTP Authentication credentials (username:password).

# Input cURL Command
curl -X POST "https://api.example.com/v1/users" \
  -H "Authorization: Bearer secret_token_123" \
  -H "Content-Type: application/json" \
  -d '{"name": "Alice", "role": "admin"}'

Translating cURL to Python Requests

In Python, the popular requests library expects headers as a dictionary and JSON bodies either as parsed dictionaries (json=...) or formatted strings (data=...):

import requests

url = "https://api.example.com/v1/users"
headers = {
    "Authorization": "Bearer secret_token_123",
    "Content-Type": "application/json"
}
payload = {
    "name": "Alice",
    "role": "admin"
}

response = requests.post(url, headers=headers, json=payload)
print(response.status_code, response.json())

Translating cURL to JavaScript Fetch API

In modern browser environments or Node.js runtime, native fetch() uses promises or async/await syntax:

const response = await fetch("https://api.example.com/v1/users", {
  method: "POST",
  headers: {
    "Authorization": "Bearer secret_token_123",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    name: "Alice",
    role: "admin"
  })
});
const data = await response.json();

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