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GuardsDOM Guards

Check File or Blob

Checks if a given value is an instance of File or Blob.

isFileOrBlob

Checks if a given value is an instance of File or Blob.

Function Signature

isFileOrBlob(value: unknown): value is File | Blob

Validation Rules

  • Must be File/Blob instance
  • Available in browser environments

Example

playground.ts

Last updated: Tue, May 26, 2026 04:14:18PM (UTC)

Check FormData

Checks if a value is a valid non-empty FormData instance.

Check FileList

Checks if a value is a FileList instance.

On this page

isFileOrBlobFunction SignatureValidation RulesExample