This content originally appeared on flaviocopes.com and was authored by flaviocopes.com
I was sending a file through a form, and after using a form with multipart/form-data, server-side I had the File objects in req.files.
This gave me some information, like the path, name, size, type and so on:
{
logo: File {
size: 121920,
path: '/var/folders/tn/h8lfq1sj7c33c0p30qgkd3mw0000gn/T/upload_b9e85b7cf989482a1760d82b77fd555a',
name: 'Screen Shot 2021-06-07 at 21.40.29.png',
type: 'image/png',
hash: null,
lastModifiedDate: 2021-06-07T22:20:50.150Z,
//...
}
}Notice the temp file path does not have an extension.
If you user the name server-side, no problem. But I wanted to change it and use my own naming conventions, so I needed just the file extension.
To get it, you can do 2 things: parse the file name, with
const path = require('path')
path.extname(req.files.logo.name) //.png
which does not require any 3rd party library.
Or you can use the mime-types package and look at the MIME type:
const mime = require('mime-types')
mime.extension('text/plain') //txt
mime.extension('image/png') //png
This content originally appeared on flaviocopes.com and was authored by flaviocopes.com
flaviocopes.com | Sciencx (2021-06-20T05:00:00+00:00) How to get the file extension in Node.js from the MIME type. Retrieved from https://www.scien.cx/2021/06/20/how-to-get-the-file-extension-in-node-js-from-the-mime-type/
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