convert buffer to binary in node.js

Question

I am using axios to request an image from a url like this:

const response = await axios.get('https://asite.dom/image/url', { responseType: 'arrayBuffer' });

I don't need and don't want to save the file locally. I just need the plain binary data for checking the image dimensions.

Thus I don't want to do this

const bufferImage = Buffer.from(response.data, 'binary');

because that's a buffer not the binary data.

I've tried to access

response.data

directly, but that's not the image's binary data either.

Can anybody help me with this?

aiyan · Accepted Answer · 2020-03-26 11:56:02Z

9

Just tested this and it works:

const response = await axios.get(
  'https://example.com/image.png', { responseType: 'arraybuffer' }
); 

const bin = response.data.toString('binary');
console.log(bin);

The key seems to be that you capitalized the b in arraybuffer. Also, response.data is already a buffer, so you can just directly convert it to a string.

answered Mar 26, 2020 at 11:56

aiyan

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2 Comments

LongHike Over a year ago

Yep, that was the problem.

user2217751 Over a year ago

OMG. THANK YOU! I've spent a day and a half trying to find the right combination. I think a lot of places have the uppercase b in the documentation

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