Here are some problems I faced, and how I solved them

ES6 Imports

Error

file:///C:/Users/IFEANYI/Documents/2024/production%20API/index.js:7
import corsOptions from "./config/corsOptions.js";
       ^^^^^^^^^^^
SyntaxError: The requested module './config/corsOptions.js' does not provide an export named 'default'
    at ModuleJob._instantiate (node:internal/modules/esm/module_job:124:21)
    at async ModuleJob.run (node:internal/modules/esm/module_job:190:5)

Solution

How to properly export a function and import the function in another file.

 // export a variable

 export const allowedOrigins = ["joy", "sam"];

 // import a variable

 import {allowedOrigins} from "./allowedOirgins.js"

How to import and export ES6

Redis server error

Error

Error Error: connect ECONNREFUSED ::1:6379

Solution

Remember to turn on the redis server.

open redis-cli.exe

redis-cli ping

If it returns "PONG", Redis is running. If it returns "Could not connect to Redis" or "Connection refused", then Redis is not running.

Redis server error

Dotenv

How to handle dotenv in your node.js code.

import dotenv from 'dotenv';
dotenv.config();

Explaining the dockerfile

FROM node:20-alpine // It instructs Docker to use a pre-built image containing Node.js version 20. This indicates that the base image is built on Alpine Linux, resulting in a smaller and more efficient Docker image.

LABEL maintainer="chimaifeanyi" // provide information about the image

WORKDIR /app // this will create a folder called app inside the image - 

COPY package*.json ./ // It copies the package.json file and potentially other matching files from your local project directory into the root directory (app) of the Docker image being built.

RUN npm install // this will install project dependencies in the container.

COPY . . // copy everything from our local project to work directory (app) in the docker image.

CMD ["node", "index.js"] // this is the command that will be used, when a container is created from the image

// when you start a container from this image, it will run the command (node index.js) to start the application.

EXPOSE 3500 // this tells docker that the nodejs application is running on port 3500 within the container