Create backend app with expressjs api

.gitignore

@@ -6,3 +6,4 @@ node_modules
 # CDK asset staging directory
 .cdk.staging
 cdk.out
+.env

README.md

@@ -33,6 +33,25 @@ npm install -D ts-node ts-node-dev typescript @types/express @types/dotenv @type
 npm install -D eslint @typescript-eslint/parser @typescript-eslint/eslint-plugin
 ```
 
+- Run backend app locally
+
+```
+cd backend
+npm install
+npm run start
+
+# watch mode
+npm run start:dev
+```
+
+- Run backend docker app locally
+
+```
+cd backend
+docker build -t backend_image .
+docker run -p 3000:3000 --name backend_app backend_image
+```
+
 ## Useful commands
 
 - `npm run build` compile typescript to js

backend/.dockerignore

@@ -0,0 +1,2 @@
+node_modules
+.env

backend/Dockerfile

@@ -0,0 +1,21 @@
+# Use node.js image as base
+FROM node:latest
+
+# Set working directory inside the container
+WORKDIR /app
+
+# Copy package.json to the working directory
+COPY package.json .
+
+# Install dependencies
+RUN npm install 
+
+# Copy everything
+COPY . .
+
+# Expose the port specified in the .env file 
+ENV PORT=${PORT}
+EXPOSE $PORT
+
+# Command to run the application
+CMD ["npm", "start"]