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What is the standard way of using selenium in production?

I have written some tests for my website using selenium and javascript. I want to know the standard way of using this script in production. Locally I'm running chrome driver and testing my script. What I have tried is in start of my package.json I run my test node test.js && react-scripts start.What is the standard way of doing the same in production?

In case there is no any difference between running the tests on your local machine and the product environment there is no reason to use your tests differently on the production.
However, it is common to run the tests on production with Jenkins or other CI/CD tools on Unix server in headless mode or with Selenium Grid etc.
In this case you will have to adjust your tests for running with Selenium Grid or in headless mode respectively, to adjust them running on Unix etc.
All this depends on YOUR actual configuration, how YOU will use it.

There are multiple different ways of handling Selenium in production. For example, if you have an open source project, you may consider using GitHub Actions. Here's an example of a JavaScript Workflow from the Selenium Project: https://github.com/SeleniumHQ/selenium/actions/workflows/javascript.yml
That's probably a good place to start, since it is open source and you can see how they run tests. Once you've learned that, you can try out some of the other popular solutions out there if you want (Eg: Jenkins, Azure Pipelines, AWS, Google Cloud, CircleCI, GitLab, TravisCI, etc.)

There is no way for you to use selenium in production, considering that you need selenium in production, such as a crawler, what may be different are your dependencies, in development you will use the dependencies for testing, selenium will use the available driver, either in production or in development/testing.
Perhaps the arguments you use for the chosen browser may be different for the environments used (production, development, etc.), which doesn't make sense to me, because in the test you should reproduce the same scenario as in production.

what is the difference between karma and phantomJS

I know that Karma is a test runner for JS Unit Testing frameworks like Jasmine or Mocha. And PhantomJS provides headless browser for running Jasmine or Mocha Tests.
But, what is the difference between Karma and PhantomJS? Are they two competing tools, or do I use PhantomJS on top of Karma to run my unit tests without a browser?

PhantomJS has nothing to do with testing. In the unit testing scope it would become one of the target browsers.
PhantomJS allows you to run unit tests in a browser when a desktop environment doesn't exist.
Karma is a runner that provides the finished reports on how successful the tests where.
Jasmine is the library used to write unit tests.
So to clarify
Jasmine unit tests are run by Karma inside the browser PhantomJS.

It seems like you have somewhat already answered your own question, but I'll expand what you have mentioned.
Karma is a test running framework that is largely test framework language agnostic. It has a rich plugin ecosystem that allows you to heavily customize how, when, and why your tests run.
In order to test Javascript, we often need to test against an incarnation of the DOM. There are numerous plugins that allow you to wire into different browsers such as karma-chrome. These plugins bootstrap the required browser and execute your tests against the browser.
However, there are times when you want to run without a physical browser being installed on the target test box. this is where PhantomJS comes in. It is a headless browser that can be run without being installed on a target machine. It cannot replace Karma. If you want to describe it as a "competitor", it would be a competitor to IE, Firefox, Chrome, and Safari.

JavaScript Unit Tests with Team Foundation Server Build

We are using Team Foundation Server 2010 and we have some JavaScript unit tests running on our local machines using Jasmine.
We are using the workflow based builds.
Has anyone had any success running Jasmine tests during their builds? Can you break the build if the Jasmine tests fail?

The way I've seen this done is using the Chutzpah Test Runner available on CodePlex: http://chutzpah.codeplex.com/
This allows you to run Jasmine/QUnit tests from a command-line which can then be easily integrated with a TFSBuild using the InvokeProcess Activity.

you should checkout http://www.codit.eu/blog/2015/03/18/continuous-integration-with-javascript-nunit-on-tfsbuild-(part-23)/
The blogpost describes a complete scenario how to execute your JavaScript Unit tests on the Team Foundation Build server. Basically it uses Grunt (taskrunner) and Powershell. It also has an example of code coverage reports that you can use.

Unit testing in RequireJS and QUnit basics

I am just trying to get my head round unit testing in Javascript and RequireJS. I am building a web-app and obviously only want to have tests run in development not production builds.
Questions:
Do you just test when you want to, or do you have JS tests running
on every page load when in development?
If tests are only on demand
then how do you trigger your tests to run? Query strings (eg.
?testing=true) or something like that?
I just need an idea of how people go about testing in development. I am using BackboneJS, RequireJS and jQuery on the front end with a NodeJS/ExpressJS server on the backend.

For a Backbone project at work we have a maven build process that runs our automated javascript tests through jsTestDriver, and we read the results with Sonar. I usually run the tests manually (with 'mvn test'), but I could easily tell maven every time I save a file, for example. I wrote a post that shows how to integrate QUnit, Requirejs, and code coverage with JSTD that is independent of Maven: js-test-driver+qunit+coverage+requirejs. It also contains links to a QUnitAdapter that is way more up-to-date and developed than the one on the jsTestDriver site. I'll update this post when I manage to write about how I got jsTestDriver working with Maven and Sonar. Hope it helps.

Grunt is a popular JS build tool. There's something called grunt-watch that can monitor certain files for change, and execute tasks accordingly. You could easily run unit tests with something like this on every save.
Usually end-to-end tests take longer, and we use the CI for that. I've seen a presentation on Meteor TDD that does end-to-end tests after every save though.
There are many end-to-end test frameworks, and they can run in a headless browser like phantom js using a build tool like grunt. Some frameworks open an actual browser to run the tests, but run via command line and report results using XML.
If you break out your components enough, the tests could have a small enough scope to run on each save.

For some core code I use JsUnit + Rhino on build server. For more complex bits (usually interface) I use selenium (it also runs on build server). I don't test anything on page load, I only use not-compressed versions of scripts.
I don't any solution for integration tests.

How can we run JavaScript jasmine tests from Jenkins (Hudson) without loading a JSP?

We have a rich web client. Our controllers and service facades are written in coffeescript (JavaScript) and jquery. In the past they would have been java.
To run our JavaScript jasmine tests from Jenkins/Hudson, we use java's junit and htmlunit to load a test oriented jsp page which includes the jasmine specs.
When the Htmlunit tries to run, it blows up trying to getPage() probably because of an XML parser class path which is extremely challenging to track down in our world.
We just want to be able to run our JavaScript tests from Jenkins and have it report failure if a JavaScript test does not pass. We are just using jsp and htmlunit in order to run JavaScript tests. Can we load the JavaScript tests and javascript code into a JavaScript engine with Jenkins as the thing that kicks it off? If so, how?

Sounds like you're in a Java environment. My jasmine-maven-plugin might be a good fit.

Jasmine Reporters would also be a solution. It has instructions for running headlessly via PhantomJS for example, and it can generate JUnit XML so Jenkins can understand the test results natively, graphing test count, duration, and failure over time.
Also, the "xvfb-run" wrapper often provided with xvfb is a great help here, so you can do "xvfb-run phantomjs.runner.sh ..." in a truly headless environment.

I've previously solved this problem by running the tests with a node.js plugin called jasmine-node
This solution of course requires node.js and a few node modules to properly run the jasmine tests. There is no real browser running the tests, but an emulated one using a module called jsdom, which basically creates a headless browser, and more specifically, a DOM, which the tests can interact with.
There's node modules for jQuery, underscore and propably other too, so these can be tested too. You can even skip the whole browser emulation if you'd rather run the tests in a browser, though I find it too cumbersome compared to automated Jenkins testing.
jasmine-node generates jUnit test reports, which Jenkins can interpret just fine.
I just realized there is some jenkins-jasmine-node plugin that might ease this process.

Grunt is your friend
use grunt http://gruntjs.com/
with grunt jasimine https://github.com/gruntjs/grunt-contrib-jasmine
with nodejs http://nodejs.org/
on jenkins using https://wiki.jenkins-ci.org/display/JENKINS/NodeJS+Plugin
got this setup and it's really nice, plus this gives you a place to start making your build server do other nice things such as deployment, unit testing, etc you know, other nice things

Can you use selenium? That would actually use a real browser then and get as close to the real environment as possible.