Getting req.param undefined

param is a function, not an object. So you need to use req.param('email');

req.params Refers to the variables in your route path.

app.get("/posts/:id", ...

// => req.params.id

Post data can be referenced through req.body

app.post("/posts", ...

// => req.body.email

This assumes you are using the bodyParser middleware.

And then there is req.query, for those ?query=strings.

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You can use req.param() for either of the 3 above. The look up order is params, body, query.