Uploading data to Storage

To upload data to Supabase Storage, we can use the Supabase JavaScript client.

Uploading a file

To upload a file, we can use the upload method.

For example, the code below is the code that uploads a user's profile image to the avatars bucket:

async function uploadUserProfilePhoto(
  client: SupabaseClient,
  photoFile: File,
  userId: string
) {
  const bytes = await photoFile.arrayBuffer();
  const bucket = client.storage.from('avatars');
  const extension = photoFile.name.split('.').pop();
  const fileName = `${userId}.${extension}`;
  const result = await bucket.upload(fileName, bytes, {
    upsert: true,
  if (!result.error) {
    return bucket.getPublicUrl(fileName).data.publicUrl;
  throw result.error;

You can also combine the above with useSWRMutation from SWR when you use the code above from a React component:

import useSWRMutation from 'swr/mutation';
function useUpdateProfile() {
  const client = useSupabase();
  const key = 'useUpdateProfile';
  return useSWRMutation(key, async (_, { arg: data }: { arg: {
    file: File;
    userId: string;
  } }) => {
    return updateUserData(client, data);

And then, you can use it like this:

const updateProfile = useUpdateProfile();
<Form onUpload={(file: File, userId: string) => {
  return updateProfile.trigger({ file, userId })
} />

Subscribe to our Newsletter
Get the latest updates about React, Remix, Next.js, Firebase, Supabase and Tailwind CSS