Blob

Blob is an interface that represents a blob, which is a file-like object of immutable, raw data; they can be read as text or binary data, or converted into a ReadableStream.

It’s the type of the data received on WebSocket.onmessage when WebSocket.binaryType is set to "blob".

A Blob instance has the following methods/properties:

Class/Property	Description
Blob.size	The number of bytes of data contained within the `Blob`.
Blob.type	A string containing the MIME type, or an empty string if the type could not be determined.
Blob.arrayBuffer()	Returns a `Promise` that resolves with the contents of the blob as binary data contained in an `ArrayBuffer`.
Blob.bytes()	Returns a `Promise` that resolves with a `Uint8Array` containing the contents of the blob as an array of bytes.
Blob.slice()	Returns a new `Blob` object which contains data from a subset of the blob on which it’s called.
Blob.stream()	Returns a ReadableStream which upon reading returns the data contained within the `Blob`.
Blob.text()	Returns a `Promise` that resolves with a string containing the contents of the blob, interpreted as `UTF-8`.