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You can have file uploads in your React app in a few minutes with Better Upload. This guide will walk you through the steps to set it up with any React framework.
Before you start, make sure you have an S3-compatible bucket ready. You can use AWS S3, Cloudflare R2, or any other S3-compatible service.
<PageSelect pages={[ { href: '/docs/quickstart', title: 'Multiple files', description: 'Upload more than one file at once.', }, { href: '/docs/quickstart-single', title: 'Single files', description: 'Upload only a single file at once.', }, ]} />
Install the better-upload package, as well as the AWS S3 Client.
npm i better-upload @aws-sdk/client-s3
Your server will create pre-signed URLs, which the client uses to upload files directly to the S3 bucket.
Change my-bucket to your bucket name, and configure the S3 client as needed.
import { S3Client } from '@aws-sdk/client-s3';
import {
createUploadRouteHandler,
route,
type Router,
} from 'better-upload/server';
const s3 = new S3Client(); // [!code highlight]
const router: Router = {
client: s3,
bucketName: 'my-bucket', // [!code highlight]
routes: {
demo: route({
fileTypes: ['image/*'],
multipleFiles: true,
maxFiles: 4,
}),
},
};
export const { POST } = createUploadRouteHandler(router);
import { createFileRoute } from '@tanstack/react-router';
import { handleRequest, route, type Router } from 'better-upload/server';
const s3 = new S3Client(); // [!code highlight]
const router: Router = {
client: s3,
bucketName: 'my-bucket', // [!code highlight]
routes: {
demo: route({
fileTypes: ['image/*'],
multipleFiles: true,
maxFiles: 4,
}),
},
};
export const Route = createFileRoute('/api/upload')({
server: {
handlers: {
POST: async ({ request }) => {
return handleRequest(request, router);
},
},
},
});
import { ActionFunctionArgs } from '@remix-run/node';
import { handleRequest, route, type Router } from 'better-upload/server';
const s3 = new S3Client(); // [!code highlight]
const router: Router = {
client: s3,
bucketName: 'my-bucket', // [!code highlight]
routes: {
demo: route({
fileTypes: ['image/*'],
multipleFiles: true,
maxFiles: 4,
}),
},
};
export async function action({ request }: ActionFunctionArgs) {
return handleRequest(request, router);
}
// When using a separate backend server, make sure to update the `api` option on the client hooks.
import { Hono } from 'hono';
import { handleRequest } from 'better-upload/server';
const app = new Hono();
const s3 = new S3Client(); // [!code highlight]
const router: Router = {
client: s3,
bucketName: 'my-bucket', // [!code highlight]
routes: {
demo: route({
fileTypes: ['image/*'],
multipleFiles: true,
maxFiles: 4,
}),
},
};
app.post('/upload', (c) => {
return handleRequest(c.req.raw, router);
});
In the example above, we create the upload route demo. Learn more about upload routes here.
You can run code before uploads in the server. Use the onBeforeUpload callback:
import { RejectUpload, route, type Router } from 'better-upload/server';
const auth = (req: Request) => ({ id: 'fake-user-id' }); // [!code highlight]
const router: Router = {
client: s3,
bucketName: 'my-bucket',
routes: {
demo: route({
fileTypes: ['image/*'],
multipleFiles: true,
maxFiles: 4,
// [!code ++:7]
onBeforeUpload: async ({ req, files, clientMetadata }) => {
const user = await auth(req);
if (!user) {
throw new RejectUpload('Not logged in!');
}
},
}),
},
};
You can change the S3 object key to any value you want. Use the onBeforeUpload callback:
const router: Router = {
client: s3,
bucketName: 'my-bucket',
routes: {
demo: route({
fileTypes: ['image/*'],
multipleFiles: true,
maxFiles: 4,
// [!code ++:7]
onBeforeUpload: async ({ req, files, clientMetadata }) => {
return {
generateObjectInfo: ({ file }) => ({
key: `files/${file.name}`,
}),
};
},
}),
},
};
<Uploader /> componentWe will now build our UI using pre-built components. We'll use <UploadDropzone /> for multiple file uploads.
Install it via the shadcn CLI:
npx shadcn@latest add @better-upload/upload-dropzone
We'll also use the useUploadFiles hook. The complete code looks like this:
'use client'; // For Next.js
import { useUploadFiles } from 'better-upload/client';
import { UploadDropzone } from '@/components/ui/upload-dropzone';
export function Uploader() {
const { control } = useUploadFiles({
route: 'demo',
});
return (
<UploadDropzone
control={control}
accept="image/*"
description={{
maxFiles: 4,
maxFileSize: '5MB',
fileTypes: 'JPEG, PNG, GIF',
}}
/>
);
}
Learn more about the hooks here.
</Step> <Step>Now place the <Uploader /> component in your app.
import { Uploader } from '@/components/uploader';
export default function Page() {
return (
<main className="flex min-h-screen flex-col items-center justify-center">
<Uploader />
</main>
);
}
You can now run your app and upload images directly to any S3-compatible service!
If you plan on uploading files larger than 5GB, take a look at multipart uploads.
<Accordions> <Accordion title="CORS Configuration">Make sure to also correctly configure CORS on your bucket. Here is an example:
[
{
"AllowedOrigins": [
"http://localhost:3000",
"https://example.com" // Add your domain here
],
"AllowedMethods": ["GET", "PUT", "POST", "DELETE"],
"AllowedHeaders": ["*"],
"ExposeHeaders": ["ETag"]
}
]
Learn more about CORS here.
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