How is form-urlencoded encoded in the generated Node.js?

application/x-www-form-urlencoded bodies map to the right primitive in each language — data= in Python, url.Values in Go, FormUrlEncodedContent in C#.

Does it preserve Content-Type?

Yes. The Content-Type header is honored and matched against the body so serialization stays consistent.

Is anything uploaded?

No. Parsing and generation happen entirely in your browser.

Send form-urlencoded with cURL in Node.js

Paste a curl command that sends form-urlencoded and get idiomatic Node.js code. We pick the right serialization for native fetch and set the correct Content-Type.

Quick answer

To convert a cURL command to Node.js, paste it into the Toolpaper workbench below. It parses the command in your browser and emits idiomatic Node.js 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.

Prefer a different target? See the full cURL to Node.js reference, or jump to the same guide in JavaScript, Python, or Go.

InputcURL command

MethodPOST·Headers1·Body30 B· Chars 139

OutputJavaScript · Node fetch(Node 18+)

// Node 18+ has global fetch
const response = await fetch("https://api.example.com/login", {
  method: "POST",
  headers: {
    "Content-Type": "application/x-www-form-urlencoded"
  },
  body: "username=ada&password=lovelace",
  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/login \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "username=ada&password=lovelace"

Implementation notes

Content-Type is detected from -H headers first, then inferred from the body shape when the header is missing.
application/x-www-form-urlencoded bodies are decoded into structured pairs so native fetch owns the encoding — you never double-encode a value.
Charset directives on Content-Type (e.g. application/json; charset=utf-8) survive the round trip.

Common mistakes

Setting Content-Type manually and then also using native fetch's helper — you end up with duplicate headers or the wrong one wins.
Mixing form encoding with JSON headers — the server rejects with 400 and it's easy to miss in code review.
Trusting the browser DevTools "Copy as cURL" to preserve charset — it often drops it. Clean panel restores common defaults.

Common questions

How is form-urlencoded encoded in the generated Node.js?: application/x-www-form-urlencoded bodies map to the right primitive in each language — data= in Python, url.Values in Go, FormUrlEncodedContent in C#.
Does it preserve Content-Type?: Yes. The Content-Type header is honored and matched against the body so serialization stays consistent.
Is anything uploaded?: No. Parsing and generation happen entirely in your browser.

More payload types in Node.js

Node.js hub →

JSON in Node.js

/how-to/send-json-with-curl-in-node

multipart form-data in Node.js

/how-to/send-multipart-with-curl-in-node

XML in Node.js

/how-to/send-xml-with-curl-in-node

GraphQL in Node.js

/how-to/send-graphql-with-curl-in-node

The same guide in other languages

All guides →

In JavaScript

/how-to/send-form-with-curl-in-javascript

In Python

/how-to/send-form-with-curl-in-python

In Go

/how-to/send-form-with-curl-in-go

In PHP

/how-to/send-form-with-curl-in-php

In Ruby

/how-to/send-form-with-curl-in-ruby

In Rust

/how-to/send-form-with-curl-in-rust

In Java

/how-to/send-form-with-curl-in-java

In Kotlin

/how-to/send-form-with-curl-in-kotlin

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