Saving ArrayBuffer in IndexedDB

Question

How can I save binary data (in an ArrayBuffer object) into IndexedDB?

The IndexedDB spec doesn't mention ArrayBuffer - does that mean that is not supported (and I have to pack ArrayBuffer as a string or a an array?).

Answer 1

Simply saving the ArrayBuffer should "just work". I believe it does in all current IndexedDB implementations.

I.e. something like:

    var trans = db.transaction("mystore", IDBTransaction.READ_WRITE); // or "readwrite"
    trans.objectStore("mystore").put(myArrayBuffer, "mykey");

Finding that this is defined by specifications is... challenging... to say the least. But it goes something like this:

• IndexedDB uses the "structured clone" definition for all stored data.
• "structured clone" is defined in the HTML5 specification and mentions a lot of data types native to Javascript and a few other types like Files and Blobs.
• The ArrayBuffer specification from Khronos defines ArrayBuffers and specifies that the HTML5 definition of "structured clone" should be changed to also clone ArrayBuffers.

Yeah, I know, I wouldn't have found it either.