How to setting up Node API with Typescript

How to setting up Node API with Typescript

This article will guide you through the steps of setting up the basic Node API with your manuscript...

Note: You should have Nodejs installed on your machine.

First thing is to create our project folder and initialize it with npm to generate the package.json file.

Install dependencies

npm i express --save
npm i @types/node @types/express ts-node typescript nodemon --save-dev

Create a tsconfig.json file in the root of your application or run npx tsc --init on your terminal and add the configuration below.

  "target": "es6",
  "module": "commonjs",
  "allowJs": true,
  "outDir": "./build",
  "rootDir": "./src",
  "esModuleInterop": true

Note: More options can be added to the tsconfig.json file. Find out more here.

Add scripts to package.json file.

    "dev": "nodemon src/app.ts",
        "start": "tsc && node build/app"

Create a srcdirectory where our application would be built. Inside the srcdirectory, create an app.ts file.

Inside the app.ts file, add the code below.

import express, { Application, Request, Response, NextFunction } from "express";

const app: Application = express();


app.get("/", (req: Request, res: Response): object => {
    return res.json({ status: "success", message: "Welcome to API Service" });

app.use((req: Request, res: Response, next: NextFunction) => {
  const error = new Error("Route Not found");

app.use((error: { message: string; status: number }, req: Request, res: Response,next: NextFunction
  ) => {
    res.status(error.status || 500);
      status: "error",
      message: error.message

const PORT: any = process.env.PORT || 3000;

app.listen(PORT, () => console.log(`app listening on port ${PORT}`));

At this point, your project structure should look like the image below.

This is image title


To run the application on the development environment, run the command below

npm run dev

Note: The above command compiles the files found in the src directory in memory.


To run the application on the production environment, run the command below

npm start

Note: The above command compiles the files found in the srcdirectory to abuild directory and runs the app.js file in the build directory, as specified above in thestart script in our package.json file.

The project used in this article can be found here.

Thanks for reading.

node-js api

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