Hi I have the following error
node_modules/connect-mongo/src/index.js:29
unserialize: options.unserialize || (x => x),
^^
I have these versions:
node@v3.3.1
express@4.14.0
mongoose@4.6.5
mongodb@2.2.11
Most probably you have an outdated version of Node.js.
The (x => x) is equivalent with function (x) { return x; } (it's called an arrow function).
Update Node.js to a version greater than 4.0.0.
Running the node process with the --harmony flag could solve the issue, but still updating the Node.js to a recent version is much better.