Get MIME type of a file without extension in Node.js

Yes, there is a module called mmmagic. It tries best to guess the MIME of a file by analysing its content.

The code will look like this (taken from example):

var mmm = require('mmmagic'),
var magic = new mmm.Magic(mmm.MAGIC_MIME_TYPE);

magic.detectFile('node_modules/mmmagic/build/Release/magic.node', function(err, result) {
    if (err) throw err;
    console.log(result);
});

But keep in mind, that the guessing of a MIME type may not always lead to right answer.

Feel free to read up on types signatures on a wiki page.

Another possibility is to use exec or execSync function to run the 'file' command on Linux SO:

/**
 * Get the file mime type from path. No extension required.
 * @param filePath Path to the file
 */
function getMimeFromPath(filePath) {
    const execSync = require('child_process').execSync;
    const mimeType = execSync('file --mime-type -b "' + filePath + '"').toString();
    return mimeType.trim();
}

However is not the better solution since only works in Linux. For running this in Windows check this Superuser question: https://superuser.com/questions/272338/what-is-the-equivalent-to-the-linux-file-command-for-windows

Greetings.