A Blob object represents a file-like object of immutable, raw data; they can be read as text or binary data, or converted into a ReadableStream so its methods can be used for processing the data. Blobs can represent data that isn't necessarily in a JavaScript-native format. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system.
To construct a Blob from other non-blob objects and data, use the Blob() constructor. To create a blob that contains a subset of another blob's data, use the slice() method. To obtain a Blob object for a file on the user's file system, see the File documentation.
The APIs accepting Blob objects are also listed in the File documentation.
- Companion:
- object
Value members
Concrete methods
A string indicating the MIME type of the data contained in the Blob. If the type is unknown, this string is empty.
A string indicating the MIME type of the data contained in the Blob. If the type is unknown, this string is empty.
Returns a promise that resolves with an ArrayBuffer containing the entire contents of the blob as binary data.
Returns a promise that resolves with an ArrayBuffer containing the entire contents of the blob as binary data.
The size, in bytes, of the data contained in the Blob object.
The size, in bytes, of the data contained in the Blob object.
Creates and returns a new Blob object which contains data from a subset of the blob on which it's called.
Creates and returns a new Blob object which contains data from a subset of the blob on which it's called.
Returns a ReadableStream that can be used to read the contents of the blob.
Returns a ReadableStream that can be used to read the contents of the blob.