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Uniquely identify browsers


This module attempts to uniquely identify browsers by examining their header and connection information. This information can be used as a "poor-man's" session identifier in your node projects. This module can optionally set a cookie to 'lock' in a consistent fingerprint.

Resuming sessions require that either the cookie be returned to the server, or a x-header x-__browserFingerprint in the default case, be sent on subsequent requests

    var http = require('http');
    var bf = require('browser_fingerprint');
    // these are the default options 
    var options = {
        cookieKey: "__browserFingerprint",
        toSetCookie: true,
        onlyStaticElements: false,
        settings: {
        path: '/',
        expires: 3600000,
    http.createServer(function (req, res) {
        bf.fingerprint(req, options, function(fingerprint, elementHash, cookieHash){
            cookieHash['Content-Type'] = 'text/plain' // append any other headers you want 
            res.writeHead(200, cookieHash);
            var resp = "";
            resp += 'Your Browser Fingerprint: ' + fingerprint + "\r\n\r\n";
            for(var i in elementHash){
                resp += "Element " + i + "" + elementHash[i] + "\r\n";
            console.log('requset from ' + req.connection.remoteAddress + ', fingerprint -> ' + fingerprint);
    }).listen(8080, '');
    console.log('Server running at' + '\r\n');