Better-cross-fetch NPM

better-cross-fetch

Adding yet another more request making library to the pile. Works on NodeJS and browsers.

It's "better" because I made it.

...why? There are so many...

While I would love to use the native fetch API on browsers and use one of the many pre-existing polyfills for NodeJS, my issue is that sometimes I want to show progress bars for larger file uploads, and so building on top of good ol' XMLHttpRequest was the answer. And if I was going to make a web-request library anyway, might as well make it cross-platform.

Oh and it also supports content compression on the NodeJS side, isn't that neat?

Fine, how do I use this?

Like this.

const {betterCrossFetch} = require("better-cross-fetch")

const url = "https://aritzcracker.ca";
const options = {
	headers: {
		"some-header": "some-value";
	},
	responseType: "text",
	throwOnErrorStatus: true,
	onUploadProgress: (current, total) => {
		console.log("Uploaded", current, "out of", total, "bytes!")
	},
	onDownloadProgress: (current, total) => {
		console.log("Downloaded", current, "out of", total, "bytes!")
	},
}

await betterCrossFetch(url, options);

That will return something like this:

{
	status: 200,
	statusText: "OK",
	response: "<!DOCTYPE html>...",
	headers: {
		server: "nginx/xxx"
	},
	url: "https://www.aritzcracker.ca/" // The final URL after any redirects
}

What's the responseType property?

It chooses how to interpret the server response. Here are the possible values and their effects

"head" HEAD request, only gets the headers.
"text" The result's response property will be a string.
"json" The response will be parsed as JSON, the result's response property will be the resulting object. This also sets the accept request header to application/json.
"buffer" The result's response will be a Buffer.
- If this option is used on browsers, a global Buffer class is expected. Consider setting your bundler to use buffer-lite!
"blob" The result's response property will be a Blob.
"dom" The result's response property will be a Document (Browser only).
"stream" The result's response property will be a Readable (readable stream) (NodeJS only).

Can I easily attach querystring data to the URL?

Yep! In fact, there's multiple ways. You can either use the URL object as your URL, or use the getData property of the options, which can be an object representing a string -> string map, an array of string pairs, or a URLSearchParams object. Note that using options.getData will over-write any pre-existing query data in the url argument.

How can I send POST data?

Take a look at the post property in your options and let your intellisense guide you. Use {type: "uri", data: {...}} for simple key-value pairs, or {type: "multipart", data: {...}} if you want to include binary data or files. There's also {type: "json", data: {...}} for API's that like that sorda thing. You're also free to put a FormData there if that's more convenient for you.

Any pitfalls?

There are 2 http statuses, 307 and 308, that require forms to be re-submitted at the redirect. POSTing NodeJS streams will break things when those redirects occur, because the stream has already been consumed on the first request, and this library doesn't provide a way to restart streams when this happens.

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