How Can I Run Multiple Node.js Scripts in Parallel Without Interference?

Multiple Scripts in Parallel: A Concurrency Conundrum

When running multiple scripts simultaneously while developing in Node.js becomes a necessity, the question arises: how can this be achieved without disrupting parallel execution?

Consider the example package.json with two scripts: "start-watch" and "wp-server." While running them sequentially may not suffice, attempting to execute them concurrently using a third script introduces a waiting scenario where "wp-server" execution is delayed.

Unlocking Parallelism with Concurrently

The solution lies in using the concurrently package, which enables parallel execution of commands while maintaining visibility of their output:

1. Install concurrently using:

   npm i concurrently --save-dev

2. Modify the "dev" script in package.json to:

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

By using double quotes around each npm command, concurrently ensures isolation of each process, allowing them to run independently without waiting for each other to complete. The "--kill-others" flag terminates all other concurrently executed commands if one command fails.

With this approach, "start-watch" and "wp-server" will run concurrently, displaying their output in parallel, providing the best environment for efficient Node.js development.

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