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Startup Remix Project

We can start a Remix app by entering the command below into the terminal

npx create-remix@latest pinata-remix

After it’s finished installed we’ll want to cd into the project and install the pinata SDK.

cd pinata-remix && npm i pinata-web3

Now let’s make a file called .env file in the root of the project with the following variables:

PINATA_JWT= # The Pinata JWT API key we got earlier
GATEWAY_URL= # The Gateway domain we grabbed earlier, formatting just as we copied it from the app

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Setup Pinata

Make a folder in the root of the project called utils, and inside make a file called pinata.ts with the following code:

import { PinataSDK } from "pinata-web3";

export const pinata = new PinataSDK({
	pinataJwt: process.env.PINATA_JWT,
	pinataGateway: process.env.GATEWAY_URL,
});

This will create an instance of the SDK we can use throughout the app.

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Upload Form and Server Action

In the app/routes directory we can remove the boilerplate code and replace it with the code below.

app/routes/_index.tsx
import type { ActionFunctionArgs, MetaFunction } from "@remix-run/node";
import { json } from "@remix-run/node";
import { Form, useActionData, useNavigation } from "@remix-run/react";
import { pinata } from "utils/config";

export const meta: MetaFunction = () => {
	return [
		{ title: "Remix + Pinata" },
		{ name: "description", content: "Upload files on Remix with Pinata!" },
	];
};

// Server side action to handle our upload
export const action = async ({ request }: ActionFunctionArgs) => {
	const formData = await request.formData();
	const file = formData.get("file") as File;
	const { IpfsHash } = await pinata.upload.file(file);
	const url = await pinata.gateways.convert(IpfsHash);
	return json({ url });
};

export default function Index() {
	const actionData = useActionData<typeof action>();
	const navigation = useNavigation();
	const isSubmitting = navigation.state === "submitting";

	return (
		<div className="font-sans p-4 flex flex-col gap-4 justify-center items-center min-h-screen max-w-[500px] mx-auto">
			<h1 className="text-3xl font-bold">Remix + Pinata</h1>
			<Form
				encType="multipart/form-data"
				method="post"
				className="flex flex-col gap-4"
			>
				<input type="file" name="file" className="" />
				<button
					className="bg-[#582CD6] text-white rounded-md p-2"
					type="submit"
				>
					{isSubmitting ? "Uploading..." : "Upload"}
				</button>
			</Form>
			{actionData?.url && (
				<div className="mt-4">
					<a
						href={actionData.url}
						target="_blank"
						rel="noreferrer"
						className="text-[#582CD6] underline"
					>
						{actionData.url}
					</a>
				</div>
			)}
		</div>
	);
}

Let’s walk through what’s happening here. To start we have our client side markup:

<div className="font-sans p-4 flex flex-col gap-4 justify-center items-center min-h-screen max-w-[500px] mx-auto">
			<h1 className="text-3xl font-bold">Remix + Pinata</h1>
			<Form
				encType="multipart/form-data"
				method="post"
				className="flex flex-col gap-4"
			>
				<input type="file" name="file" className="" />
				<button
					className="bg-[#582CD6] text-white rounded-md p-2"
					type="submit"
				>
					{isSubmitting ? "Uploading..." : "Upload"}
				</button>
			</Form>
			{actionData?.url && (
				<div className="mt-4">
					<a
						href={actionData.url}
						target="_blank"
						rel="noreferrer"
						className="text-[#582CD6] underline"
					>
						{actionData.url}
					</a>
				</div>
			)}
		</div>

This is a simple Form element provided by Remix which lets us make a submission to a server action. The most important piece to notice here is the encType="multipart/form-data", which is crucial to make file / multipart requests work in Remix!

Then we have our server action:

export const action = async ({ request }: ActionFunctionArgs) => {
	const formData = await request.formData();
	const file = formData.get("file") as File;
	const { IpfsHash } = await pinata.upload.file(file);
	const url = await pinata.gateways.convert(IpfsHash);
	return json({ url });
};

This will be the default endpoint used when we submit our form. It will parse the incoming formData, get the file attached, and then we upload it to Pinata using pinata.upload.file(). From that method we deconstruct the result and return the IpfsHash which we can use in convert. This will make a URL we can return to the client and make accessible to the user, and in our case the <a> tag that links to the content