Supabase Storage errorSupabase Storage: InvalidKey, the specified key is invalid

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Why the key is invalid, and the fix

1. 01

   The file name has accents, emoji or other scripts

   “The specified key is invalid.” Supabase docs, Storage error codes (InvalidKey)

   A name like résumé.pdf, a photo named with an emoji, or a file name in Arabic or Chinese fails, because Storage allows only plain Latin letters, digits and some punctuation.

2. 02

   The name has a character outside the allowed list

   “File names can only include the following characters: Alphanumeric: A-Z, a-z, 0-9” Supabase docs, Storage limits (File name restrictions)

   Characters such as #, %, [ ], { }, < >, ^, ~ and | aren’t on the list. Spaces, &, ?, + and = are allowed. A slash is read as a folder, so a name with a slash creates folders you didn’t mean to make.

3. 03

   The path comes straight from user input

   Generate the path instead, and keep the display name in a column next to the path.

   const ext = file.name.includes('.') ? file.name.split('.').pop().toLowerCase().replace(/[^a-z0-9]/g, '') : '';
   const path = `${user.id}/${crypto.randomUUID()}${ext ? '.' + ext : ''}`;
   const { error } = await supabase.storage.from('uploads').upload(path, file);
   if (!error) await supabase.from('files').insert({ path, name: file.name });

4. 04

   A move or copy uses the old name

   move() and copy() take a new path too, so build that path the same way. Renaming a file to the user’s new title brings the same error back.

Checked against the vendor’s docs on November 9, 2026: Supabase docs: Storage error codes; Supabase docs: Storage limits.

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