How Can I Run Multiple npm Scripts Concurrently and See Their Output?

Running Multiple npm Scripts Concurrently

In the realm of Node.js development, there are often scenarios where you need to execute multiple npm scripts simultaneously. A prevalent dilemma arises when these scripts need to run independently, with their outputs visible in the terminal. This article delves into a pragmatic solution to achieve parallel script execution.

The Challenge

Consider a situation where you have two npm scripts in your package.json file: "start-watch" and "wp-server." To initiate development, you want both scripts to run concurrently. While the initial impulse may be to create a third script that sequentially executes these tasks, that approach introduces undesirable delays.

The Solution

The solution lies in leveraging a powerful package called concurrently. Installing it into your project's development dependencies is as simple as:

npm i concurrently --save-dev

Once installed, you can configure your "dev" npm script in package.json to run your two desired scripts in parallel:

"dev": "concurrently --kill-others \"npm run start-watch\" \"npm run wp-server\""

By adding the "--kill-others" flag, you ensure that any existing instances of the scripts are terminated before launching them anew. This eliminates the possibility of conflicting outputs and ensures the scripts are always running in parallel.

Concurrent Output Visibility

A crucial aspect of parallel script execution is maintaining the visibility of their outputs. Concurrently handles this seamlessly by creating multiple processes and presenting their outputs side by side in the terminal.

Tying It All Together

In summary, concurrently provides an elegant solution for running multiple npm scripts concurrently. By installing it into your project and modifying your "dev" npm script as described above, you can effortlessly initialize your development environment with multiple scripts operating in parallel and their outputs displayed transparently. This approach empowers you to work efficiently and keep track of the progress of all your scripts without missing a beat.

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