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Check mime type from base64 string in Node.js
const fileType = require('file-type')
const base64String = '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'
const mimeInfo = fileType(Buffer.from(base64String, 'base64'))
console.log(mimeInfo)
// output: { ext: 'png', mime: 'image/png' }
@EF3178

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@EF3178 EF3178 commented Jan 26, 2021

does not work. Error : "fileType is not a function"

@sarmadfaheem95

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@sarmadfaheem95 sarmadfaheem95 commented Jan 29, 2021

you can use fileType.fromBuffer()

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