Node-fetch: How do you read binary data?

[caub]

It seems a few methods like .blob() are missing to do so

the idea is just making something similar to:

request('some.png', (err, res, body)=>{
    console.log(Buffer.from(body).toString('base64'));
});

[jimmywarting]

This is more of a stackoverflow question and not an issue or a bug

---

you can use res.body which is a stream...
So you can pipe it. Example: res.body.pipe(dest)
or do:

res.body.on('data', chunk => {
   // Got a chunked buffer
}).on('end' () => {
   // end of stream 
})

You now also have the alternativ method to browsers arrayBuffer which is called just buffer (as of v1.6.0) and it will resolve to a node buffer instance res.body.buffer()

fetch('some.png')
.then(res => res.buffer())
.then(console.log)

[caub]

Great answer, thanks, sorry

hmm, note with 1.6.0:

fetch('https://small.sdsu.edu/sites/all/themes/zen_larc/widgets/larcrating/smile_small.png')
.then(r=>r.body.buffer())
// .then(r=>r.body.arrayBuffer())
.catch(console.error)

gives me:

TypeError: r.body.arrayBuffer is not a function / TypeError: r.body.buffer is not a function

[bitinn]

Yeah as documented in known differences and #51, on Node.js there isn't much point in using arrayBuffer.

[wengeezhang]

This is more of a stackoverflow question and not an issue or a bug

you can use res.body which is a stream...
So you can pipe it. Example: res.body.pipe(dest)
or do:

res.body.on('data', chunk => {
   // Got a chunked buffer
}).on('end' () => {
   // end of stream 
})

You now also have the alternativ method to browsers arrayBuffer which is called just buffer (as of v1.6.0) and it will resolve to a node buffer instance res.body.buffer()

fetch('some.png')
.then(res => res.body.buffer())
.then(console.log)

just use res.buffer(), not res.body.buffer(), as follows:
fetch('some.png')
.then(res => res.buffer())
.then(console.log)