Cannot get the value of an ArrayBuffer Object in Javascript

Question

I have an ArrayBuffer object that I need to be able to convert to String to JSON, but I can't get the value of the [Int8Array] out of the object, even though it is clearly there.

I've tried all variations on this, but they all return undefined

console.log(result);//Returns the array buffer
//Following methods all return undefined?
console.log(result["[[Int8Array]]"]);
console.log(result[[[Int8Array]]]);
console.log(result[[["Int8Array"]]]);
console.log(result[Int8Array]);
console.log(result["Int8Array"]);

How can I get all the Int8Array or UInt8Array values that are clearly available in the object?

You should be able to get the individual values using console.log(result[0]) etc. — user5734311
– user5734311, Commented Jan 17, 2019 at 8:33
That did not work, also always returns undefined. The comment below is correct in that I needed to instantiate a new ArrayBuffer for the values. — Sven0567
– Sven0567, Commented Jan 17, 2019 at 8:37

Endless · Accepted Answer · 2020-11-23 10:49:12Z

9

You can use the textDecoder that accepts ArrayBuffer (as well as uint8array) without having to deal with Uint8array's:

var str = new TextDecoder().decode(arrayBuffer)
var json = JSON.parse(str)

if you want to get straight to json

var json = await new Response(arrayBuffer).json()

edited Nov 23, 2020 at 10:49

answered Jan 17, 2019 at 8:41

Endless

38.8k14 gold badges118 silver badges138 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Alexandre Elshobokshy · Accepted Answer · 2019-01-17 08:35:35Z

8

You need to intiantiate a new Uint8Array to get their values, you can't access them directly using your ArrayBuffer instance.

var buf = new ArrayBuffer(8);
var int8view = new Uint8Array(buf);
console.log(int8view)

JSFiddle : https://jsfiddle.net/v8m7pjqb/

answered Jan 17, 2019 at 8:35

Alexandre Elshobokshy

11k6 gold badges35 silver badges61 bronze badges

Collectives™ on Stack Overflow

Cannot get the value of an ArrayBuffer Object in Javascript

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related