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building an API with express node.js
I have to build an API for weather application using express node.js. since I am not saving any data, I am not using the database. my application allows the user to enter a city name, and the weather information will retrieve directly from the openweathermap.org
It's difficult to answer your question with specifics without seeing where you're at in your code. The documentation of the API section you're looking for is probably on this page. Note that you'll need an API key to use their API.
If that doesn't get you on the right track, please post your code here as a workspace snapshot. You could also use a similar service such as codepen if you're more comfortable with that.