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In the fast-paced world of web development, creating scalable and maintainable applications is crucial. One powerful combination for building robust server-side applications is Node.js, Express.js, and TypeScript. In this blog post, we will explore the process of setting up a Node.js Express project using TypeScript, providing you with the benefits of static typing while harnessing the full potential of the Express framework.
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Need For TypeScript
- Strong Typing: TypeScript enforces static typing, which means that variables, function parameters, and return values have predefined types. This helps catch type-related errors at compile-time rather than runtime, making code more robust and reliable.
- Improved Code Quality: With TypeScript’s type checking, developers can write safer and more self-documenting code. This reduces the likelihood of runtime errors and makes it easier for other developers to understand and maintain the codebase.
- Enhanced Tooling: TypeScript provides advanced tooling and IDE support. Features like code navigation, auto-completion, and inline documentation (intellisense) help developers be more productive and write error-free code.
- Readability and Maintainability: TypeScript’s type annotations and interfaces make code more readable and understandable. This is particularly beneficial in larger codebases and when working in teams, as it provides clear expectations about data shapes and function signatures.
- Error Prevention: TypeScript can catch common programming errors early in development, reducing the need for extensive testing and debugging.
- Tool Integration: TypeScript integrates seamlessly with popular build tools like Webpack and Babel and task runners like Gulp and Grunt. It works well with popular frontend frameworks like Angular, React, and Vue.js.
- Community and Support: TypeScript has a growing and active community, which means you can find plenty of resources, libraries, and documentation to support your development efforts.
Steps to Use TypeScript in NodeJS Express Project
In this application, I am using VS Code Editor. You can choose any IDE or Editor.
- We should install TypeScript in our system. This can be done by running the below command-
yarn global add typescript
Through typescript, we can use the “tsc” command.
2. We will create a NodeJS project. Create your project directory, open the terminal, and navigate to the project directory. In your terminal, give the command
npm init -y
It will generate a boilerplate for our node application and create “package.json” file.
3. Next, we will install all the dependencies required in our project.
yarn add -D typescript express ts-node nodemon @types/node @types/express
- typescript – With this, we can use typescript in our project.
- express – It is our NodeJS framework
- ts-node – With this, we can run the node app in typescript directly without the precompilation.
- nodemon – It will watch the server for changes and re-run our application when our code changes.
- @types/node – With this, we can use custom typescript types for nodes.
- @types/express – With this, we can use custom typescript types for express.
4. Next, in your terminal, run the command
It will create a typescript config file, “tsconfig”. In this file, there will be many compiler options present that we can use in our typescript projects. The required options will be uncommented, and the rest will be commented. Here, we have to change “target” to “ES6”, “rootdir“ to “./src and outdir” to “./dist”.
We will create a src folder and an “app.ts” file.
In our package.json file, we have to change the script commands.
- nodemon src/app.ts— To run the node app in TypeScript.
- tsc -p .— To compile the TypeScript.
5. Now we will add basic code to our app.ts
Its compiled app.js file will contain
It will create a production ready “dist” folder.
Setting up Node.js Express with TypeScript is a powerful combination that offers numerous benefits for modern web development.
By following the steps outlined in this guide, you can kickstart your development journey with this technology stack.
Drop a query if you have any questions regarding TypeScript and we will get back to you quickly.
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1. What is “tsconfig.json”?
2. Can we use Typescript with other frameworks like ReactJS and Angular?
WRITTEN BY Satyam Dhote