File Upload Next Js Supabase

7 min read Oct 03, 2024

Uploading Files to Supabase from Your Next.js Application

Integrating file uploads into your Next.js application is a common requirement, and Supabase provides a robust and user-friendly platform for storage. This guide will walk you through the steps of setting up file uploads from your Next.js project to Supabase, enhancing your application's functionality.

Getting Started with Supabase

Before embarking on file upload integration, ensure you have a Supabase project set up. If you haven't already, you can create one for free at .

Creating Your Next.js Project

If you don't have an existing Next.js project, use the following command to create one:

npx create-next-app@latest my-supabase-app

Replace my-supabase-app with your desired project name.

Setting Up Supabase Storage

Navigate to your Supabase dashboard and access the "Storage" section. From there, create a new bucket to store your uploaded files. Choose a descriptive bucket name and select the appropriate settings based on your needs.

Installing Dependencies

To interact with Supabase storage from your Next.js application, install the necessary dependencies:

npm install @supabase/supabase-js

Creating Your File Upload Component

Inside your Next.js project, create a new component file (e.g., FileUpload.js) to handle the file upload functionality. Within this component, you'll implement the logic to select a file, upload it to Supabase storage, and handle any potential errors.

Example FileUpload.js Component:

import { useState } from 'react';
import { createClient } from '@supabase/supabase-js';

const supabaseUrl = 'YOUR_SUPABASE_URL'; // Replace with your Supabase URL
const supabaseKey = 'YOUR_SUPABASE_KEY'; // Replace with your Supabase Key

const FileUpload = () => {
  const [file, setFile] = useState(null);
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState(null);

  const supabase = createClient(supabaseUrl, supabaseKey);

  const handleFileChange = (e) => {
    setFile(e.target.files[0]);
  };

  const handleUpload = async () => {
    setIsLoading(true);
    setError(null);

    try {
      const { error: uploadError } = await supabase.storage
        .from('your-bucket-name')
        .upload(file.name, file, {
          cacheControl: '3600', // Optional: Set cache control headers
          upsert: true, // Optional: Overwrite existing files
        });

      if (uploadError) {
        throw uploadError;
      }

      setIsLoading(false);
      // Optionally display a success message
      console.log('File uploaded successfully!');
    } catch (error) {
      setError(error.message);
      setIsLoading(false);
    }
  };

  return (
    
      
      
      {error && {error}}
    
  );
};

export default FileUpload;

Key Points:

Supabase Credentials: Replace the placeholder YOUR_SUPABASE_URL and YOUR_SUPABASE_KEY with your actual Supabase project credentials.
Storage Bucket Name: Ensure you replace your-bucket-name with the name of the bucket you created in Supabase.
File Selection: The handleFileChange function sets the selected file using the useState hook.
Upload Logic: The handleUpload function uses the supabase.storage.from().upload() method to initiate the upload process.
Error Handling: The code includes error handling to display appropriate messages if the upload fails.
UI Elements: You can customize the UI elements (button, progress indicator, etc.) to provide a better user experience.

Using Your File Upload Component

Now you can use your FileUpload component within any of your Next.js pages:

import FileUpload from './FileUpload'; // Import your component

const MyPage = () => {
  return (
    
      File Upload
      
    
  );
};

export default MyPage;

Retrieving Uploaded Files

To retrieve a file from Supabase storage, you can use the supabase.storage.from().download() method.

Example:

const downloadFile = async (fileName) => {
  try {
    const { data, error } = await supabase.storage
      .from('your-bucket-name')
      .download(fileName);

    if (error) {
      throw error;
    }

    // Handle the downloaded data (e.g., display the file in a browser)
  } catch (error) {
    console.error(error);
  }
};

Adding File Metadata (Optional)

To associate additional information (e.g., file type, description) with your uploaded files, you can use Supabase's database to store file metadata.