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stream-file-type
Advanced tools
Get the [file type](https://github.com/sindresorhus/file-type) by inspecting a stream.
Get the file type by inspecting a stream.
const fs = require('fs')
const FileType = require('stream-file-type')
const input = fs.createReadStream('cat.jpg')
const detector = new FileType()
// Listen for event...
detector.on('file-type', (fileType) => {
if (fileType === null) {
console.log(`The mime type of "cat.jpg" could not be determined`)
} else {
console.log(`The file "cat.jpg" has the "${fileType.mime}" mime type`)
}
})
// ...or get a Promise
detector.fileTypePromise().then((fileType) => {
if (fileType === null) {
console.log(`The mime type of "cat.jpg" could not be determined`)
} else {
console.log(`The file "cat.jpg" has the "${fileType.mime}" mime type`)
}
})
input.pipe(detector).resume()
new FileType() => DuplexStream
Returns a new DuplexStream
that will detect the file type of the content passing thru. All the data is passed as-is right thru the stream, and can be further piped to another destination.
When enough bytes have come thru to determine the file type (currently 4100) the event file-type
will be emitted with the result of the detection. The result will either be null
or an object with ext
and mime
.
ext
- One of the supported file typesmime
- The MIME typeFileType#fileTypePromise() => Promise
Returns a Promise
of the detected file type. If the file-type
event has already been emitted, the promise will be resolved with the result, otherwise the promise will be resolved when the file-type is detected, or rejected if an error occurs.
FAQs
Get the [file type](https://github.com/sindresorhus/file-type) by inspecting a stream.
The npm package stream-file-type receives a total of 2,652 weekly downloads. As such, stream-file-type popularity was classified as popular.
We found that stream-file-type demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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