1/12/2023 0 Comments Nodejs process![]() Process.exitCode = 1 // Great, I'll wait till you're done. Process.exitCode allows the Node.js process to terminate naturally and avoids the Node process to do additional work around event loop scheduling. Process Events The process object is an instance of EventEmitter and emits the following events Example Create a js file named main. There are several methods available in a process object. Use process.exitCode to safely terminate a Node.js process The process object is a global object and can be accessed from anywhere. This happens when V8 engine cannot recover. Such is a method called process.nextTick () which is used by developers in real-time applications every day to defer the execution of a function until the next Event Loop Iteration. It can be accessed from anywhere, thus its methods can also be accessed. This exit code happens when your JavaScript source code fails to return a function value.Įxit code 5 is for fatal errors. The process object is one of the few global objects provided by the NodeJS core API. Node.js exit code 4 happens rarely and only for development. Node.js exit code 3 is for a status code when internal code cannot be parsed. This exit code is reserved Bash for misuse. There is another, and safer approach to terminate a Node.js process. Process.exit() is one of the methods for Node.js to terminate a process. You may also pass 0.Įxit code 1 is for when unhandled fatal exceptions occur that was not handled by the domain. ![]() That’s the default exit code process.exit() uses when nothing is passed into the function. Exit code 0Įxit code 0 lets Node.js know to terminate when no more async operations are happening. The process module is always available by default, so you don’t need to import it into your code using require () function. Here’s a list of exit codes and what they do. NodeJS has a built-in module called process that provides you with the information related to your currently running NodeJS process. Process.exit() accepts arguments which are just status codes or in this case exit codes. ![]() In the examples above, you may have seen me add 1 as an argument. Node.js is designed for building distributed applications with many nodes. Using multiple processes is the best way to scale a Node application. Process.exit(1) // Don't care, we're shutting down The fact that Node.js runs in a single thread does not mean that we can’t take advantage of multiple processes and, of course, multiple machines as well. Process.exit() will try to quickly terminate the process even if asynchronous calls have not completed.įetchCatData('fluffikins') // I'm still waiting for the content! Process.exit() is the most common command to terminate a Node.js process. You may have seen this often in Node.js projects. process.exit() will force a Node.js process termination In a typical ExpressJS application or any NodeJS application, we can access the process object.In this article I’m going to show how to terminate Node.js process with 2 different methods, and explain the exit code statuses when terminating a Node.js process. See below example: const express = require('express') We can use this interface to get the main module. The NodeJS process.mainModule is an in-built application programming interface of the process module. Conclusion 1 – What is the NodeJS process.mainModule?.2 – Practical Use of NodeJS process.mainmodule.1 – What is the NodeJS process.mainModule?.
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