This guide will walk you through setting up Pinata in a SvelteKit app.

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Create an API Key and get Gateway URL

To create an API key, visit the Keys Page and click the “New Key” button in the top right. Once you do that you can select if you want your key to be admin or if you want to scope the privileges of the keys to certain endpoints or limit the number of uses. Make those selections, then give the key a name at the bottom, and click create key.
If you are just getting started we recommend using Admin privileges, then move to scope keys as you better understand your needs
Once you have created the keys you will be shown your API Key Info. This will contain your Api Key, API Secret, and your JWT. Click “Copy All” and save them somewhere safe!
The API keys are only shown once, be sure to copy them somewhere safe!
After you have your API key, you will want to get your Gateway domain. When you create a Pinata account, you’ll automatically have a Gateway created for you! To see it, simply visit the Gateways Page see it listed there. The gateway domains are randomly generated and might look something like this: 
aquamarine-casual-tarantula-177.mypinata.cloud

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Server-side Setup

This guide will walk you through a server side upload flow in SvelteKit

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Start up SvelteKit Project

The easiest way to start building a SvelteKit app is to run npm create 
npm create svelte@latest pinata-app
- Which Svelte app template? Skeleton project
- Add type checking with TypeScript? Yes, using TypeScript syntax
- Select additional options (use arrow keys/space bar) <- These are optional
After the project is created cd into the repo and install pinata 
npm i pinata
In this demo we will be using tailwindcss with typography plugin. Follow other CSS Framework guides respectively. 
npx svelte-add@latest tailwindcss
After making the project, create a .env.local file in the root of the project and put in the following variables: 
PINATA_JWT=
PUBLIC_GATEWAY_URL=
Use the JWT from the API key creation in the previous step as well as the Gateway Domain. The format of the Gateway domain should be mydomain.mypinata.cloud.

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Setup Pinata

Create a directory called server in the src/lib folder of the project and then make a file called pinata.ts inside of it. In that file we’ll export an instance of the Files SDK that we can use throughout the rest of the app.
The use of the server directory prevents it being used client side.
src/lib/server/pinata.ts
import { PinataSDK } from "pinata"
import { PINATA_JWT } from "$env/static/private";
import { PUBLIC_GATEWAY_URL } from "$env/static/public";

export const pinata = new PinataSDK({
  pinataJwt: `${PINATA_JWT}`,
  pinataGateway: `${PUBLIC_GATEWAY_URL}`
})

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Create Client Side Form

Next we’ll want to add a form on our home page that will allow someone to select a file and upload it. In the src/routes/+page.svelte file take out the boiler plate code and use the following. Lets also restrict the allowed extensions for the file. (e.g. jpg, jpeg, png, webp).
src/routes/+page.svelte
<script lang="ts">
  import { enhance } from '$app/forms';

  let uploading = false;

  function handleUpload() {
    uploading = true;
      return async ({ update }) => {
        await update();
        uploading = false;
      };
  }
</script>

<main class="w-full min-h-screen m-auto flex flex-col justify-center items-center">
  <form method="POST" enctype="multipart/form-data" use:enhance={handleUpload}>
    <input type="file" id="file" name="fileToUpload" accept=".jpg, .jpeg, .png, .webp" />
    <button disabled={uploading} type="submit">
      {uploading ? 'Uploading...' : 'Upload'}
    </button>
  </form>
</main>
This will take a file from the client side and upload it through a form Action we are going to make next.

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Create Server Action

Create a server file, src/routes/+page.server.ts, so that we can add a form action to use. Since this demo and page only has 1 form, we will keep the default action.
src/routes/+page.server.ts
import { fail, json, type Actions } from "@sveltejs/kit";
import { pinata } from "$lib/server/pinata";

export const actions: Actions = {
  default: async ({ request }) => {
    try {
      const formData = await request.formData();
      const uploadedFile = (formData?.get('fileToUpload') as File);

      if (!uploadedFile.name || uploadedFile.size === 0) {
        return fail(400, {
          error: true,
          message: "You must provide a file to upload"
        })
      }

      const upload = await pinata.upload.public.file(uploadedFile);
      const url = await pinata.gateways.public.convert(upload.cid);
      return { url, filename: uploadedFile.name, status: 200 };
    } catch (error) {
      console.log(error);
      return json(
        { error: "Internal Server Error" },
        { status: 500 }
      );
    }
  }
}
The form action will send an API request to Pinata with the upload, then use the resulting CID to create a URL we can use to see the content. Once complete, we can define the return data sent to the client.

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Access the Returned value of the Form Action

We can access the returned data by exporting the form prop on our +page.svelte. Now, after submitting the form, the form prop will be updated and we can conditionally render the image we just uploaded.
src/routes/+page.svelte
<script lang="ts">
  import { enhance } from '$app/forms';
  import type { ActionData } from './$types';

  export let form: ActionData;
  let uploading = false;

  function handleUpload() {
    uploading = true;
      return async ({ update }) => {
        await update();
        uploading = false;
      };
  }
</script>

<main class="w-full min-h-screen m-auto flex flex-col justify-center items-center">
  <form method="POST" enctype="multipart/form-data" use:enhance={handleUpload}>
    <input type="file" id="file" name="fileToUpload" accept=".jpg, .jpeg, .png, .webp" />
    <button disabled={uploading} type="submit">
      {uploading ? 'Uploading...' : 'Upload'}
    </button>
  </form>
  {#if form && form.status === 200}
    <img src={form.url} alt={form.filename} />
  {/if}
</main>
And just like that we have uploaded an image to Pinata and recieved a usable URL in return! Remember that the url for the image is ephemeral, once you refresh the page the url and image will be gone.