mirror of
https://github.com/oven-sh/bun
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95 lines
2.8 KiB
Markdown
95 lines
2.8 KiB
Markdown
---
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name: Upload files via HTTP using FormData
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---
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To upload files via HTTP with Bun, use the [`FormData`](https://developer.mozilla.org/en-US/docs/Web/API/FormData) API. Let's start with a HTTP server that serves a simple HTML web form.
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```ts#index.ts
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const server = Bun.serve({
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port: 4000,
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async fetch(req) {
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const url = new URL(req.url);
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// return index.html for root path
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if (url.pathname === "/")
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return new Response(Bun.file("index.html"), {
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headers: {
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"Content-Type": "text/html",
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},
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});
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return new Response("Not Found", { status: 404 });
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},
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});
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console.log(`Listening on http://localhost:${server.port}`);
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```
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---
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We can define our HTML form in another file, `index.html`.
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```html#index.html
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<title>Form</title>
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</head>
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<body>
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<form action="/action" method="post" enctype="multipart/form-data">
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<input type="text" name="name" placeholder="Name" />
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<input type="file" name="profilePicture" />
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<input type="submit" value="Submit" />
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</form>
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</body>
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</html>
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```
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---
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At this point, we can run the server and visit [`localhost:4000`](http://localhost:4000) to see our form.
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```bash
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$ bun run index.ts
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Listening on http://localhost:4000
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```
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---
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Our form will send a `POST` request to the `/action` endpoint with the form data. Let's handle that request in our server.
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First we use the [`.formData()`](https://developer.mozilla.org/en-US/docs/Web/API/Request/formData) method on the incoming `Request` to asynchronously parse its contents to a `FormData` instance. Then we can use the [`.get()`](https://developer.mozilla.org/en-US/docs/Web/API/FormData/get) method to extract the value of the `name` and `profilePicture` fields. Here `name` corresponds to a `string` and `profilePicture` is a `Blob`.
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Finally, we write the `Blob` to disk using [`Bun.write()`](https://bun.com/docs/api/file-io#writing-files-bun-write).
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```ts-diff#index.ts
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const server = Bun.serve({
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port: 4000,
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async fetch(req) {
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const url = new URL(req.url);
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// return index.html for root path
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if (url.pathname === "/")
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return new Response(Bun.file("index.html"), {
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headers: {
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"Content-Type": "text/html",
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},
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});
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+ // parse formdata at /action
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+ if (url.pathname === '/action') {
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+ const formdata = await req.formData();
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+ const name = formdata.get('name');
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+ const profilePicture = formdata.get('profilePicture');
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+ if (!profilePicture) throw new Error('Must upload a profile picture.');
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+ // write profilePicture to disk
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+ await Bun.write('profilePicture.png', profilePicture);
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+ return new Response("Success");
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+ }
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return new Response("Not Found", { status: 404 });
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},
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});
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```
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