Express recap and API lab

[mabelleeyanhwa]

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visualize express app request-response flows walk through express 4.x API docs: https://expressjs.com/en/4x/api.html (e.g. req.query) other response methods (see gitbook) folder structure (express is not opinionated. routes, models, views, middlewares) lab: https://github.com/thoughtworks-jumpstart/data-gov-api-lab