How do we make part of the route optional in Expressjs?

Question

How do I make a part of the route(not just parameters) as optional? For example in:

\pid\:pid\did\:did

If did is not present :did should not be present.

How do I go about writing a route for this?

Answer 1

As per your requirement, you have to create two end point.

1. /pid/:pid
2. /pid/:pid/did/:did

This will solve your problem.