What is a blob

Blob stands for Binary Large Object.

• high-level, file-like object that represents immutable, raw binary data.

Subtypes of blob like AudioBlob is a Blob that contains audio data.

• identified with MIME type specification like audio/mpeg, audio/wav, etc.

What is a high level object?

• Object with properties like size and type (MIME type).

blob characteristics

Blobs are immutable, you need to slice or create a new Blob to change its content.

Blobs are treated like a file.

• you can create a URL for it and pass it around.

Because Blob is an encapsulated object, you can't directly access the bytes.

• you can request for it using a method.

myAudioBlob.arrayBuffer().then(arrayBuffer => {
  // 'arrayBuffer' holds the raw buffered bytes of the audio data.
  // You can create a TypedArray to work with the buffered bytes.
  const uint8Array = new Uint8Array(arrayBuffer);
});