handling-file-uploads

Implement secure file uploads in Next.js App Router with Supabase Storage.

Updated Aug 23, 2026
One-click install
npx skills add https://github.com/alexejluft/brudi --skill handling-file-uploads
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: handling-file-uploads
Source: https://github.com/alexejluft/brudi/tree/main/skills/handling-file-uploads
Command: npx skills add https://github.com/alexejluft/brudi --skill handling-file-uploads

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill streamlines the process of building robust file upload functionality in Next.js applications, ensuring secure and efficient handling from client-side input to server-side storage.

Core Features & Use Cases

  • Client-Side Validation: Implements checks for file size and type before upload.
  • Server-Side Validation: Enforces strict validation on the API route for security.
  • Supabase Storage Integration: Manages file storage and retrieval using Supabase.
  • Progress Feedback: Provides visual feedback during the upload process.
  • Image Optimization: Includes client-side resizing for better performance.
  • Use Case: Implementing a user profile picture upload feature where users can select an image, see the upload progress, and have it securely stored in Supabase.

Quick Start

Use the handling-file-uploads skill to implement a secure file upload feature in your Next.js app.

Frequently Asked Questions about handling-file-uploads

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I securely upload files to Supabase Storage from a Next.js App Router application?▼

Secure file uploads in Next.js to Supabase Storage are handled by validating files on both the client and API routes before storage. This approach enforces strict server-side type and size checks, preventing unsafe files from reaching your Supabase buckets.

What is the best way to show upload progress when sending files to Supabase?▼

Providing upload progress feedback involves tracking the file transmission state from the Next.js client to Supabase Storage. The skill manages this visual feedback loop so users see a real-time progress indicator while the file uploads securely to the backend.

Why do I need server-side validation for file uploads if I check them on the client?▼

Server-side validation for file uploads is necessary because client-side checks can be easily bypassed. Enforcing strict validation within your Next.js API routes guarantees that file size and type constraints are securely met before saving to Supabase Storage.

Can I optimize images on the client before uploading them to Supabase in Next.js?▼

Yes, you can optimize images on the client before uploading them to Supabase. The skill includes client-side image resizing to reduce file dimensions, ensuring better performance and faster uploads directly within your Next.js application workflow.

How do I validate file size and type before uploading to Supabase?▼

Validating file size and type before uploading to Supabase requires implementing specific checks on both the client-side interface and the Next.js server-side API routes. This dual-layer validation ensures only approved files are processed and stored.