How to convert node.js Buffer to JavaScript object without an intermediate string

Question

I have a Buffer instance which contains utf-8 JSON.

Usually you convert it this way:

const buffer = Buffer.from('{"a":1}')
const str = buffer.toString("utf-8")
const obj = JSON.parse(str)

To make the Buffer->Object conversion more performant how would I convert it without an intermediate string?

@AjAX. The code by your link creates an intermediate string. I'm looking for a way to avoid any intermediate strings (or any other intermediate data). — Vasyl Boroviak
– Vasyl Boroviak, Commented Apr 30, 2018 at 11:31

Vasyl Boroviak · Accepted Answer · 2018-04-30 12:17:27Z

13

The JSON.parse can accept Buffer instances.

const buffer = Buffer.from('{"a":1}')
const obj = JSON.parse(buffer)

answered Apr 30, 2018 at 12:17

Vasyl Boroviak

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7 Comments

deEr. Over a year ago

That’s what said in the link.

Vasyl Boroviak Over a year ago

@AjAX. Nope. The link does not say so.

deEr. Over a year ago

”Convert a Buffer to JSON. Buffers can convert to JSON.” Even the URL says it.

Vasyl Boroviak Over a year ago

This: console.log(JSON.parse(Buffer.from('{"a":1}'))) prints this: { a: 1 } in node.js v4 or later. Looks like you are using TypeScript, not JavaScript.

Elringus Over a year ago

Unfortunately, it still converts the buffer to string under the hood: stackoverflow.com/a/66994351/1202251

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