Convert cURL to JavaScript fetch()

How cURL to JavaScript (fetch) works

The JavaScript output uses fetch() with a RequestInit object — method, headers, body and credentials map one-to-one from the cURL flags. JSON bodies are stringified with JSON.stringify, urlencoded bodies use URLSearchParams, and multipart bodies use FormData. Response handling uses await response.json() (or .text() / .blob() depending on the Content-Type) and checks response.ok for HTTP errors, since fetch only rejects on network failures, not non-2xx responses.

JavaScript (fetch) code example

Realistic GET + POST with headers and a JSON body, written using fetch (Web API).

// GET with headers and query params
const params = new URLSearchParams({ page: "1", limit: "50" });
const res = await fetch(`https://api.example.com/users?${params}`, {
  method: "GET",
  headers: {
    "Authorization": "Bearer YOUR_TOKEN",
    "User-Agent": "MyApp/1.0",
  },
});
if (!res.ok) throw new Error(`HTTP ${res.status}`);
const users = await res.json();

// POST with JSON body
const created = await fetch("https://api.example.com/users", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_TOKEN",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({ name: "Ada Lovelace", email: "[email protected]" }),
});
console.log(created.status, await created.json());

cURL to JavaScript (fetch) — FAQ

Convert to other languages

Need the same cURL command in a different language? Use one of these converters:

• cURL to Python
• cURL to Node.js
• cURL to PHP
• cURL to Go
• cURL to Java
• cURL to C#
• cURL to Ruby