An Introduction To JavaScript Blobs and File Interface
What is a Blob?
A
blob object represents a chuck of bytes that holds data of a file. But
a blob is not a reference to a actual file, it may seem like it is.
A
blob has its size and MIME type just like a file has. Blob data is
stored in the memory or filesystem depending on the browser and blob
size. A blob can be used like a file wherever we use files.
Most
APIs for working with blobs are asynchronous. But synchronous versions
of APIs are also available so that they can be used in Web Workers.
Content of a blob can be read as ArrayBuffer and therefore it makes blobs very handy to store binary data.
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