Supabase Storage errorSupabase Storage: “Bucket not found” (NoSuchBucket)

Rather not fix it yourself? App Fix Ticket starts with a fixed-price diagnosis, then a fixed price for the fix before any fix work.

Why the bucket isn’t found, and the fix

1. 01

   The bucket exists, but this user can’t see it

   “Verify the bucket name and ensure it exists in the system, if it exists you don't have permissions to access it.” Supabase docs, Storage error codes (NoSuchBucket)

   Storage answers the same way for a missing bucket and one the user can’t access. A private bucket with no SELECT policy on storage.objects looks missing to the anon and authenticated roles.

2. 02

   A public URL for a private bucket

   getPublicUrl always builds a URL, even for a private bucket, and that URL fails when opened. Uploads to a private bucket also need an INSERT policy on storage.objects. Make the bucket public if the files are meant to be public, or use createSignedUrl for private files.

   const { data, error } = await supabase.storage
     .from('invoices') // private bucket
     .createSignedUrl(`${user.id}/march.pdf`, 60 * 10); // valid for 10 minutes
   if (error) throw error;
   window.open(data.signedUrl);

3. 03

   The name doesn’t match

   The bucket id in the code must match the dashboard exactly, including case and dashes. A folder path in the bucket name, such as avatars/users, also fails: the folder belongs in the file path.

   // bucket: 'avatars', file path: 'users/123.png'
   await supabase.storage.from('avatars').upload('users/123.png', file);

4. 04

   The client points at another project

   The bucket was made in one project, but SUPABASE_URL points at another one, such as local, staging or an old project. Check the URL in the running build, not only in your .env file.

5. 05

   The new environment has no bucket

   A bucket made by hand in the dashboard doesn’t exist in a fresh staging project, and supabase db reset rebuilds the local stack without it. Create it in a migration, seed file or the [storage.buckets] section of supabase/config.toml so every environment has it. Keep public false unless every file may be seen by anyone with the link.

   insert into storage.buckets (id, name, public)
   values ('avatars', 'avatars', false) -- set true only for files anyone may see
   on conflict (id) do nothing;

Checked against the vendor’s docs on November 9, 2026: Supabase docs: Storage error codes; Supabase docs: Creating buckets; Supabase docs: Storage access control.

Rather hand it over?

Fixed scope, fixed price, paid upfront. The work happens in writing; no call needed.

• from $450App Fix TicketOne reproducible bug in an existing mobile or web app, diagnosed and fixed.See scope and start
• from $450AI-Built App RescueA Lovable, Bolt or Cursor app checked end to end in 3 days, then its worst problems fixed at a fixed price.No issues worth fixing, no charge. If the Launch Check finds nothing rated medium or higher, Simon refunds the full $450. You keep the report either way. This applies to the first 10 Launch Checks bought after October 30, 2026.See scope and start

Related: Supabase Storage bucket is public · Supabase new row violates row-level security · Supabase staging environment · Supabase Storage EntityTooLarge (413)