A practical guide to using Vercel Blob for file storage in Next.js applications. Covers creating public and private Blob stores, uploading files via server-side Route Handlers and direct browser client uploads, validating file type and size, serving private files through authenticated routes, safely deleting blobs, and protecting store credentials. Includes code examples for each pattern and security considerations like never trusting client-side validation, authenticating before issuing upload tokens, and treating files as immutable by using random pathnames.
Table of contents
Public and private Blob storesCreate a Blob storeUpload from the serverBuild the upload formClient validation is not securityUpload directly from the browserStore the Blob pathnameDelete a BlobUpload a private fileServe a private fileProtect the store credentialTreat files as immutable337 Impressions