How to run script that uses NestJs service

How to Run a Script that Uses NestJS Service

If you are working with TypeScript and NestJS, you may come across a situation where you need to run a script that utilizes a NestJS service. Running such a script can be a bit tricky, but fear not! In this blog post, we will explore different solutions to help you run a script that uses a NestJS service.

Solution 1: Using NestJS CLI

The easiest way to run a script that uses a NestJS service is by utilizing the NestJS CLI. The CLI provides a convenient way to bootstrap and run your NestJS application, including scripts that rely on NestJS services.

To run a script using the NestJS CLI, follow these steps:

1. Make sure you have the NestJS CLI installed globally by running the following command:

npm install -g @nestjs/cli

2. Create a new file for your script, e.g., my-script.ts.
3. Import the necessary NestJS modules and services in your script file.
4. Write your script logic, utilizing the NestJS service as needed.
5. Open your terminal and navigate to the directory where your script file is located.
6. Run the script using the following command:

nest start my-script.ts

By running the script with the NestJS CLI, you ensure that the NestJS application is properly bootstrapped, and all dependencies are loaded.

Solution 2: Manually Bootstrapping the NestJS Application

If you prefer to manually bootstrap your NestJS application instead of using the CLI, you can still run a script that utilizes a NestJS service. Here’s how:

1. Create a new file for your script, e.g., my-script.ts.
2. Import the necessary NestJS modules and services in your script file.
3. Manually bootstrap the NestJS application by creating an instance of the NestFactory and initializing the necessary modules.
4. Write your script logic, utilizing the NestJS service as needed.
5. Open your terminal and navigate to the directory where your script file is located.
6. Run the script using the following command:

ts-node my-script.ts

By using ts-node, you can directly run the TypeScript file without the need for manual compilation.

These are two different approaches to run a script that uses a NestJS service. Choose the one that suits your needs and preferences the best.

Happy coding!