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Features

  • File upload and download
  • Public and private buckets
  • File transformations
  • Image resizing
  • Access control
  • CDN integration

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Setup

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1. Enable Storage in Supabase

  1. Go to your Supabase project dashboard
  2. Navigate to Storage in the sidebar
  3. Create a new bucket or use the default public bucket

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2. Configure Environment Variables

Add these variables to your .env file: 
NEXT_PUBLIC_SUPABASE_URL=your-project-url
NEXT_PUBLIC_SUPABASE_ANON_KEY=your-anon-key

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3. Install Dependencies

bun add @supabase/supabase-js

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Usage

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Initialize Supabase Client

// apps/web/src/lib/supabase.ts
import { createClient } from '@supabase/supabase-js'

export const supabase = createClient(
  process.env.NEXT_PUBLIC_SUPABASE_URL!,
  process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!
)

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File Upload

// Example file upload function
async function uploadFile(file: File, bucket: string = 'public') {
  const { data, error } = await supabase.storage
    .from(bucket)
    .upload(`uploads/${file.name}`, file)

  if (error) {
    throw error
  }

  return data
}

​
File Download

// Example file download function
async function downloadFile(path: string, bucket: string = 'public') {
  const { data, error } = await supabase.storage
    .from(bucket)
    .download(path)

  if (error) {
    throw error
  }

  return data
}

​
Get Public URL

// Get public URL for a file
function getPublicUrl(path: string, bucket: string = 'public') {
  const { data } = supabase.storage
    .from(bucket)
    .getPublicUrl(path)

  return data.publicUrl
}

​
Delete File

// Delete a file
async function deleteFile(path: string, bucket: string = 'public') {
  const { error } = await supabase.storage
    .from(bucket)
    .remove([path])

  if (error) {
    throw error
  }
}

​
Bucket Management

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Create Bucket

// Create a new bucket
async function createBucket(name: string, isPublic: boolean = false) {
  const { data, error } = await supabase.storage
    .createBucket(name, {
      public: isPublic
    })

  if (error) {
    throw error
  }

  return data
}

​
List Files

// List files in a bucket
async function listFiles(bucket: string = 'public') {
  const { data, error } = await supabase.storage
    .from(bucket)
    .list()

  if (error) {
    throw error
  }

  return data
}

​
Security

​
Row Level Security (RLS)

Enable RLS on your storage buckets to control access: 
-- Example RLS policy for authenticated users
CREATE POLICY "Authenticated users can upload files"
ON storage.objects
FOR INSERT
TO authenticated
WITH CHECK (bucket_id = 'public');

-- Example RLS policy for public access
CREATE POLICY "Public files are accessible to everyone"
ON storage.objects
FOR SELECT
TO public
USING (bucket_id = 'public');

​
Access Control

  1. Public Buckets
    • Files are publicly accessible
    • Use for public assets like images
    • No authentication required
  2. Private Buckets
    • Files require authentication
    • Use for user uploads
    • Implement RLS policies

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Best Practices

  1. File Organization
    • Use meaningful folder structures
    • Implement file naming conventions
    • Clean up unused files
  2. Security
    • Enable RLS on all buckets
    • Validate file types
    • Set file size limits
    • Use private buckets for sensitive data
  3. Performance
    • Use CDN for public files
    • Implement caching strategies
    • Optimize file sizes
  4. Error Handling
    • Implement proper error handling
    • Add retry logic for uploads
    • Validate file operations

​
Common Use Cases

  1. User Profile Images 
    async function uploadProfileImage(userId: string, file: File) {
  const path = `profiles/${userId}/${file.name}`
  const { data, error } = await supabase.storage
    .from('private')
    .upload(path, file)

  if (error) throw error
  return data
}
  2. Document Storage 
    async function uploadDocument(userId: string, file: File) {
  const path = `documents/${userId}/${file.name}`
  const { data, error } = await supabase.storage
    .from('private')
    .upload(path, file)

  if (error) throw error
  return data
}
  3. Public Assets 
    async function uploadPublicAsset(file: File) {
  const path = `assets/${file.name}`
  const { data, error } = await supabase.storage
    .from('public')
    .upload(path, file)

  if (error) throw error
  return data
}

​
Troubleshooting

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Common Issues

  1. Upload Failures
    • Check file size limits
    • Verify bucket permissions
    • Ensure proper authentication
  2. Access Denied
    • Verify RLS policies
    • Check user authentication
    • Confirm bucket settings
  3. Performance Issues
    • Use CDN for public files
    • Implement caching
    • Optimize file sizes

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Additional Resources

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