Hi I am here to help you regarding the API challenges related to Node Js. By using the Node js as backend language & Mongo DB as database I develop the system API's related to Web app development. The framework that I used is Express Js.
The charges that I prefer will be based on the number of API's that client needs. Work on time is best practice for me because the deadlines are very important for our respected clients. I will not take the project, if I do not have a Knowledge or understanding. I prefer to work on the projects which I can done as best as possible.
Thanks.
Fee free to contact me.