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Sample web application

Minimal 3 tier web application

  • React frontend: Uses react query to load data from the two apis and display the result
  • Node JS and Golang APIs: Both have / and /ping endpoints. / queries the Database for the current time, and /ping returns pong
  • Postgres Database: An empty PostgreSQL database with no tables or data. Used to show how to set up connectivity. The API applications execute SELECT NOW() as now; to determine the current time to return.

Running the Application

While the whole point of this course is that you probably won't want/need to run the application locally (See: 11-development-workflow), we can do so as a starting point.

The Makefile contains the commands to start each application.

Postgres

It's way more convenient to run postgres in a container as we saw in 04-using-3rd-party-containers, so we will do that.

make run-postgres will start postgres in a container and publish port 5432 from the container to your localhost.

api-node

To run the node api you will need to run npm install to install the dependencies (I used node v19.4.0 and npm v9.2.0).

After installing the dependencies, make run-api-node will run the api in development mode with nodemon for restarting the app when you make source code changes.

api-golang

To run the golang api you will need to run go mod download to download and install the dependencies (I used go1.19.1)

After installing the dependencies, make run-api-golang will build and run the api.

client-react

Like api-node, you will first need to install the dependencies with npm install (again, I used node v19.4.0 and npm v9.2.0)

After installing the dependencies, make run-client-react will use vite to run the react app in development mode.