Toolpaper

Convert cURL to Next.js

Paste any curl command and get JavaScript code you can drop into a Next.js project. Server actions and route handlers using native fetch. Runs entirely client-side.

Quick answer

To convert a cURL command to JavaScript, paste it into the Toolpaper workbench below. It parses the command in your browser and emits idiomatic JavaScript code — headers, query string, request body, authentication (Bearer, Basic, API key), and cookies are all wired up automatically. No data is uploaded; conversion is fully client-side.

InputcURL command
MethodPOST·Headers1·Body40 B· Chars 132
OutputJavaScript · fetch(browser/Node)
const response = await fetch("https://api.example.com/users", {
  method: "POST",
  headers: {
    "Content-Type": "application/json"
  },
  body: "{\"name\":\"Ada\",\"email\":\"ada@example.com\"}",
  redirect: "manual"
});
const data = await response.json();
Inspect

Example

A representative curl command for this scenario. Paste your own above to convert an exact match.

curl input
curl -X POST https://api.example.com/users \
  -H "Content-Type: application/json" \
  -d '{"name":"Ada","email":"ada@example.com"}'

Implementation notes

  • Generated code uses the fetch primitive that fits Next.js's idioms — you can drop it into a controller, action, or service.
  • Errors and timeouts propagate naturally so you can wrap the call in Next.js's middleware and observability layer.
  • Environment variables replace inline secrets when you run the output through the Clean panel first.

Common mistakes

  • Blocking a request-scoped Next.js handler on a slow upstream — always set a timeout in the generated call.
  • Recreating an HTTP client per request instead of reusing a module-level one — kills keep-alive performance.
  • Leaking request-scoped headers (auth, tracing) to upstream calls — the generator only forwards what you paste.

Common questions

Which JavaScript library does the Next.js output use?
fetch, because it's the idiomatic choice inside Next.js. Switch libraries in the language dropdown any time.
Can I use this in a serverless function?
Yes. The generated code is a plain JavaScript function; deploy it on Next.js's serverless target of choice.
Is any data sent to Toolpaper's servers?
No. Parsing and code generation run entirely in your browser.

Full JavaScript reference on the cURL to JavaScript hub, or open the main converter for all 18 targets.