Best for
Developers building an internal tool or SaaS feature that needs a file browser UI connected to cloud storage like Supabase Storage, Vercel Blob, or S3
Stack
A ready-made File Manager UI you can fork, run, and customize with the prompt pack below.
What's actually inside
The honest engineer's breakdown — what the File Managertemplate does, how it's wired, and where it's opinionated.
The File Manager template is a full-featured file browser UI built in Next.js with shadcn/ui. At its core, FolderTreeSidebar renders a collapsible directory tree with expand/collapse chevrons and active-folder highlighting, while FileListPanel displays the contents of the selected folder as either a grid or a sortable list — with columns for name, size, modified date (formatted via date-fns as '3 days ago'), and a file type icon. The two panels stay in sync through Zustand, which also manages selected files, clipboard state for cut/copy operations, and the current folder path.
The UploadDropzone uses react-dropzone for drag-and-drop file selection with per-file upload progress bars and MIME type/size validation. ActionToolbar shows contextual Rename, Move, Delete, Download, and Share buttons when one or more files are selected. FilePreviewDrawer slides in from the right with image thumbnails, text content previews, and PDF page 1 rendered via iframe — plus full metadata (size, created_at, MIME type). SearchBar filters the FileListPanel in real time by filename within the active folder. BreadcrumbNav shows the current path with each segment clickable to navigate up the tree.
The honest caveat: the template ships with mock data. None of the file operations (upload, move, delete) connect to real storage out of the box. That is actually by design — the UI is backend-agnostic — but it means your first prompt after forking will almost always be to wire in your actual storage provider. The prompt pack below is structured around that migration path.
Key UI components
FolderTreeSidebarCollapsible folder tree with expand/collapse and active folder highlighting
FileListPanelGrid/list toggle view of files with name, size, modified date, and type icon columns
FilePreviewDrawerSlide-in panel with image/text/PDF preview and file metadata
BreadcrumbNavClickable path navigation showing and linking each folder segment
UploadDropzonereact-dropzone area with per-file progress bars and type/size validation
ActionToolbarContextual Rename, Move, Delete, Download, Share buttons for selected files
SearchBarReal-time filename filter for the current folder's FileListPanel contents
Libraries it leans on
react-dropzoneHandles drag-and-drop file selection with MIME type and size limit validation
date-fnsFormats file modified timestamps as relative strings ('3 days ago', 'Jan 5, 2026')
ZustandTracks selected files, current folder path, and clipboard state for cut/copy operations
shadcn/uiTable, Sheet (drawer), Breadcrumb, ContextMenu, Dialog (rename/delete confirm), Progress components
Fork it and get it running
Forking takes under five minutes. The template runs on mock data immediately — storage wiring is a one-prompt step after you have the UI verified.
Fork the template into your V0 workspace
Go to https://v0.dev/chat/community/hN0nNvAchzi in your browser. Click the 'Fork' button in the top-right corner of the chat view. V0 copies the full template into a new chat in your workspace. A free v0.dev account is all you need.
Tip: If you see 'Remix' instead of 'Fork', it is the same action.
You should see: A new V0 chat opens with the file manager code loaded and the Preview tab available.
Add storage env vars in the Vars panel
Click the Vars panel in the V0 sidebar. If you're using Supabase Storage, add NEXT_PUBLIC_SUPABASE_URL and NEXT_PUBLIC_SUPABASE_ANON_KEY — both start with NEXT_PUBLIC_ because the Supabase JS client runs in the browser. If you're using Vercel Blob, add BLOB_READ_WRITE_TOKEN instead. The template ships with mock data so env vars are not required to see the UI, but you'll need them before the storage prompts below do anything real.
Tip: Never put the Supabase service role key as a NEXT_PUBLIC_ variable — that bypasses row-level security.
You should see: Vars panel shows your storage credentials saved for use in subsequent prompts.
Verify the UI with mock data
Open the Preview tab. Confirm the FolderTreeSidebar shows a folder hierarchy and that clicking a folder updates the FileListPanel. Drag a file onto the UploadDropzone to check that the progress bar animation triggers (even if no real upload happens with mock data). Open a file in FilePreviewDrawer by clicking it to confirm the slide-in panel renders.
Tip: If the Drawer doesn't open, the shadcn Sheet component may need a 'use client' directive — see the gotchas below.
You should see: All UI panels render and interact correctly with mock data in the Preview.
Wire real storage with the first prompt
In the V0 chat, paste the 'Replace mock data with Supabase Storage' prompt from the pack below. V0 will replace hardcoded file arrays with supabase.storage.from('files').list(currentPath) calls and map the response to the FileListPanel's expected format. After this step, actual files in your Supabase Storage bucket will appear in the template.
Tip: Make sure the 'files' bucket exists in your Supabase project and that RLS allows the anon key to list objects.
You should see: FileListPanel shows real files from your Supabase Storage bucket.
Publish to production
Click the Share button (top-right of the V0 editor), open the Publish tab, and click 'Publish to Production'. Vercel builds and deploys the app in 30–60 seconds. The NEXT_PUBLIC_ env vars from the Vars panel are automatically included in the build.
You should see: A live Vercel URL serves the file manager connected to your storage backend.
Connect to GitHub for ongoing development
Open the Git panel in V0 and click Connect. Enter a repo name and V0 creates a branch named v0/main-{hash} with your code. Open the pull request in GitHub and merge to main. File managers typically need more iteration than simple UI tools — connecting to GitHub early lets you continue development in Cursor or your local editor with full context.
Tip: This is recommended early for file managers since storage wiring often requires debugging beyond V0's chat interface.
You should see: Code is on GitHub in your own repo, ready for further development in any editor.
The prompt pack
Copy-paste these straight into v0's chat to customize the File Managertemplate. Each one names this template's own components — no generic filler.
Replace mock data with Supabase Storage
Turns the mock-data template into a live file browser backed by a real Supabase Storage bucket, with automatic refresh on mutations.
Replace all hardcoded file arrays in FolderTreeSidebar and FileListPanel with live Supabase Storage API calls. Use supabase.storage.from('files').list(currentPath, { limit: 100 }) to fetch the contents of the currently selected folder. Map the returned objects to the FileListPanel's expected format with fields name, size, created_at, and metadata.mimetype for the type icon. Initialize the Supabase client using NEXT_PUBLIC_SUPABASE_URL and NEXT_PUBLIC_SUPABASE_ANON_KEY from environment variables. Refresh the file list after any upload, delete, or rename action completes.Add drag-and-drop file move between folders
Adds real file moving between folders via drag-and-drop using Supabase Storage's move API, with optimistic UI and error handling.
When a file card in FileListPanel is dragged over a FolderTreeSidebar folder item, highlight the target folder with a blue border using drag-over state. On drop, call supabase.storage.from('files').move(oldPath, newPath) where newPath combines the target folder path with the original filename. After a successful move, refresh both the FolderTreeSidebar and FileListPanel. Show a shadcn toast notification on success and a destructive toast if the move fails. Use the Zustand store's clipboard state to track the file being dragged.Add expiring signed URL sharing via ActionToolbar
Enables secure time-limited file sharing directly from the ActionToolbar without exposing public bucket URLs.
Add a Share button to the ActionToolbar that activates when exactly one file is selected. When clicked, call supabase.storage.from('files').createSignedUrl(filePath, 3600) to generate a 1-hour signed URL. Copy the URL to the clipboard immediately and show a shadcn toast confirming 'Link copied — expires in 1 hour'. Add a dropdown option on the Share button to select custom expiry: 1 hour (3600s), 24 hours (86400s), or 7 days (604800s). Disable the Share button for folder selections.Add file versioning history in FilePreviewDrawer
Adds a complete file versioning system with a history panel in FilePreviewDrawer and one-click restore, using a Supabase table to track version metadata.
Create a file_versions table in Supabase with columns (id uuid default gen_random_uuid(), file_path text, version_number integer, storage_path text, uploaded_by text, created_at timestamptz default now()) with RLS enabled and an authenticated insert policy. On each successful upload via UploadDropzone, insert a new version row with the current file_path and incremented version_number. Add a 'Version History' button in FilePreviewDrawer that opens a secondary panel listing all versions for the current file with timestamps and a 'Restore' button. Restore should call supabase.storage.from('files').move() to replace the current file and insert a new version row.Add Clerk auth with per-user isolated storage folders
Adds full auth with Clerk so each user sees only their own files in an isolated namespace, with RLS enforcement at the database level.
Wrap the app in ClerkProvider using NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY. Add middleware.ts with clerkMiddleware() that requires authentication on all routes except the sign-in page. Namespace each user's files under their Clerk userId in all Supabase Storage paths: prefix every FolderTreeSidebar path and FileListPanel API call with users/{userId}/ where userId comes from useAuth().userId. Update the UploadDropzone to prepend the userId namespace to the upload path. Set an RLS policy on the file_versions table using auth.uid() to ensure users can only read and write their own version records. Store CLERK_SECRET_KEY as a server-only env var (no NEXT_PUBLIC_ prefix).Gotchas when you extend it
The failures people actually hit when they push this template past its defaults — and the exact fix for each.
warn: incorrect peer dependency 'react@19.0.0' in build logs (may cause build failure)Why: react-dropzone's peer dependency declaration may not yet include React 19 in older published versions, causing npm to log a warning or in strict mode fail the install.
Fix: This is usually a warning, not a fatal error. If the build fails, add "overrides": {"react": "^19"} to package.json. Most react-dropzone functionality works correctly with React 19 despite the peer warning.
Add an overrides field to package.json: {"overrides": {"react": "^19"}} to resolve the react-dropzone peer dependency warning with React 19Supabase Storage CORS error in V0 Preview — requests fail with 'Access-Control-Allow-Origin' errorWhy: V0's preview domain (*.v0.dev or *.vercel.app preview URLs) may not be in Supabase's allowed origins for Storage requests, causing the browser to block the fetch before it reaches Supabase.
Fix: Add the V0 preview URL to Supabase Dashboard → Settings → API → Allowed Hosts. Alternatively, test directly with a published Vercel URL where CORS is less restrictive — click Share → Publish to Production first.
Add the V0 preview domain to Supabase Storage allowed origins in the Supabase Dashboard settings
FilePreviewDrawer shows blank for PDFsWhy: Rendering PDFs via iframe requires the file URL to carry a CORS-permissive Content-Type header. Public bucket URLs in Supabase Storage may not include this; only signed URLs reliably carry the correct headers.
Fix: Use supabase.storage.from('files').createSignedUrl(filePath, 60) to get a short-lived signed URL for PDF preview in FilePreviewDrawer, even for files in public buckets.
Use createSignedUrl() with a 60-second expiry for PDF preview URLs in FilePreviewDrawer instead of the public bucket URL
ReferenceError: localStorage is not defined on initial renderWhy: If the Zustand store's folder path or selected files are hydrated from localStorage in the store initializer, Next.js SSR will throw this error because localStorage does not exist on the server.
Fix: Move all localStorage reads into a client-side useEffect with [] deps. Initialize the Zustand store with undefined or empty values and hydrate after mount.
Move the Zustand store's localStorage hydration from the store initializer function to a client-side useEffect with [] dependency array in the component that reads folder state
Template vs. custom — the honest call
A forked template gets you far, fast. Here's where it holds up, and where you'll outgrow it.
The template is enough when
- You need a file browser UI for an internal tool where employees upload and manage assets
- You're building a SaaS feature where each user has a personal file storage section and standard operations (upload, preview, delete, share) are sufficient
- You need a working file manager shipped in days, not weeks, to validate the concept with users
- Your file management requirements are standard — no collaborative editing, no full-text search, no virus scanning
Go custom when
- You need Google Drive-like real-time collaborative editing directly on files, not just file management
- You need full-text search across file contents (OCR, document parsing) rather than just filename filtering
- You need complex permission systems with team folders, granular sharing rules, and an audit log of every action
- You need virus scanning on uploads or compliance-grade data handling (HIPAA, SOC 2)
RapidDev builds production file managers on top of v0 prototypes — with Supabase Storage, Clerk auth, per-user namespacing, and signed URL sharing — typically in 1-2 weeks.
Frequently asked questions
Is the File Manager template free to fork?
Yes. All v0.dev community templates are free to fork with a free v0.dev account. There are no fees for the template itself. Costs only arise from your storage provider (Supabase, Vercel Blob, S3) and from Vercel hosting if you exceed the free tier.
Can I use this template commercially?
Yes. V0 community templates are permissively licensed and can be used in commercial products and client projects. The third-party libraries included — react-dropzone, date-fns, Zustand, shadcn/ui — are all MIT licensed. Always check your storage provider's terms separately.
Why does my fork break in V0 Preview when I add Supabase credentials?
The V0 Preview sandbox may not be in Supabase's allowed CORS origins, so storage API calls fail in Preview even though they work after deployment. Add your V0 preview domain to Supabase Dashboard → Settings → API → Allowed Hosts, or test the storage integration using a published Vercel URL instead.
Does this template work with Vercel Blob instead of Supabase Storage?
Yes. The template's file operations are abstracted enough that you can substitute any storage provider. Add BLOB_READ_WRITE_TOKEN in the Vars panel and prompt v0 to replace the Supabase storage calls with Vercel Blob's put(), list(), and del() API methods. The FolderTreeSidebar and FileListPanel UI stays the same.
How do I make files private so users only see their own uploads?
Use the Clerk auth + per-user namespacing prompt from the pack above. It prefixes every storage path with users/{userId}/ and adds RLS policies on any Supabase tables so the database layer enforces isolation, not just the frontend.
Why is the file list empty after I connect Supabase Storage?
The most common cause is an empty bucket or an RLS policy that blocks the anon key from listing objects. In the Supabase Dashboard, go to Storage → Policies and verify the anon role has SELECT access on the objects table for your bucket. Also confirm the bucket name in the code matches the one you created ('files' is the default in the prompt but you may have named it differently).
Can RapidDev customize this file manager for my product?
Yes. RapidDev builds production file managers on v0 prototypes with Supabase Storage, Clerk auth, per-user namespacing, and signed URL sharing — typically delivered in 1-2 weeks. Reach out for a scoping call.
What is the react-dropzone peer dependency warning in build logs?
react-dropzone may declare a peer dependency on React 18 while your project uses React 19. This usually shows as a warning, not a build failure. If your build does fail because of it, add "overrides": {"react": "^19"} to the overrides field in package.json — the Zustand prompt in the pack above includes this fix.
Outgrowing the template?
RapidDev turns v0 prototypes into production apps — real auth, database, and payments — at $13K–$25K.
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