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docs: use crypto.randomBytes for custom filename example (#1386) #1392

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docs: use crypto.randomBytes for custom filename example (#1386) #1392

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7 changes: 6 additions & 1 deletion README.md
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Expand Up @@ -207,12 +207,17 @@ where you are handling the uploaded files.
The disk storage engine gives you full control on storing files to disk.

```javascript
const crypto = require('crypto')

const storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, '/tmp/my-uploads')
},
filename: function (req, file, cb) {
const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9)
// Use a cryptographically strong suffix so filenames cannot be
// guessed or enumerated from a weak PRNG like `Math.random()`. The
// built-in `DiskStorage` default uses the same approach.
const uniqueSuffix = crypto.randomBytes(16).toString('hex')
cb(null, file.fieldname + '-' + uniqueSuffix)
}
})
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