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browser_fingerprint

Uniquely identify browsers

Browser Fingerprint

Build Status

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 browserFingerprint = require('browser_fingerprint');
 
    // these are the default options 
    var options = {
        cookieKey: "__browserFingerprint",  // The name of the cookie we'll save to identify this browser on subsequent requests 
        toSetCookie: true,                  // Should we set a cookie? 
        onlyStaticElements: false,          // Should we only use components to our hash algorithm which can be deterministically recreated, or are random elements allowed? 
        settings: {
        path: '/',                        // cooke path (use `/` for this whole domain) 
        expires: 3600000,                 // cookie expiry 
      }
    };
 
    http.createServer(function (req, res) {
        browserFingerprint.fingerprint(req, options, function(error, fingerprint, elementHash, cookieHash){
            if (error) { throw error }
 
            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";
            }
 
            res.end(resp);
 
            console.log('request from ' + req.connection.remoteAddress + ', fingerprint -> ' + fingerprint);
        });
    }).listen(8080, '127.0.0.1');
 
    console.log('Server running at http://127.0.0.1:8080/' + '\r\n');