javascript online tester reddit

Codepen, jsfiddle and the browser itself

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Just use VSCode with the Live Server plugin which will auto reload your changes after you save. Completely free and doesn’t require internet

reddit.com › r/learnjavascript › what website do you use to test html,css and javascript online?

r/learnjavascript on Reddit: What website do you use to test html,css and javascript online?

November 30, 2021 -

Im now learning javascript and inadvertently went to a page that had all three code windows open - html, css and javascript and at the bottom of the page was the test view.

Im looking for something similar or that page I lost the link to.

Thanks

Videos

youtube.com

javascript code online test

youtube.com

Can you test JavaScript without a build step!?!

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YouTube

How to test JavaScript in the browser using the browser console ...

Online Compiler for JavaScript | Chapter 17 | Lightning Web ...

February 18, 2025

16:57

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Beginner’s Guide to JavaScript Testing and its Best Practices ...

November 19, 2024

youtube.com

JavaScript Unit Testing Tutorial for Beginners

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reddit.com › r/learnjavascript › where is the best place to test my javascript knowledge?

r/learnjavascript on Reddit: Where is the best place to test my Javascript knowledge?

May 16, 2023 -

Currently I am learning Javascript on FreeCodeCamp. I was wondering if anyone knew where the best place was to challenge my skills or knowledge on beginner to intermediate coding problems. I'm willing to do this as I know how beneficial this can be to learning a programming language. I've heard of sites such as LeetCode, but I haven't really looked into it. If you guys could please give me some suggestions on what websites are the best that would be greatly appreciated.

The job market 😂 Seriously, you don't apply, just go on freelancers website where they post different tasks, find one and try to do it yourself. There are also websites that offer challenges such as: codewars, codechef, coderbyte books here: https://www.reddit.com/r/Frontend/comments/zgwvti/any_js_coding_challenge_solution_books/

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JSFiddle - Code Playground

JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle.

reddit.com › r/learnjavascript › how do you unit test javacript on a website?

r/learnjavascript on Reddit: How do you unit test javacript on a website?

October 12, 2023 -

I'm pulling my hair out trying to figure out how to unit test my website's javascript. It seems like most popular tools (ex. Mocha) only work in Node.JS.

It sounds like you are after something that will test a page running in the browser, rather than the scripts etc that render the page. Perhaps you mean something other than unit testing. Do you want to test things like the user-interactions, or correct loading of the page? Perhaps more like end-to-end testing? Assuming so, the E2E testing framework I found to be easiest to set up and run is Cypress , which allows tests to examine the page in the browser, and to interact with elements. It even allows you to intercept API calls, so tests can spy on requests, and/or mock and stub responses. That said, there is a bit more work involved to start with. But the setup provides a very good guide with lots of examples. And the documentation is pretty good. If you know tools like Mocha or Chai then the test syntax should be largely familiar.

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All your javascript should be in files.To run the unit tests the easiest way would be to run jest on node.js. You simply import your javascript code and test your functions. This assumes that you have your javascript code in .js files. If you don't have individual files / modules with your javascript code, you should probably overthink your project setup.Normally you would have a build step using a bundler like webpack or vite to generate your frontend js files. If you are using inline javascript in plainn html files I don't think you should be worrying about unit tests

reddit.com › r/learnjavascript › is there a way to test my js code without setting up an html?

r/learnjavascript on Reddit: Is there a way to test my js code without setting up an html?

June 6, 2021 -

Sorry for asking this I suposse this gets asked a lot here but I could not find any info on the matter.

I am learning js for web developing but I already know python. I have been learning for 2 days and today I started js codewars.

Everytime I want to set up an exercise I have to create an html file, link the file to the html, launch the html in the browser, write the code in the js file, open the console on firefox and check if my function has the correct output (I use console.log to check)

It gets old real quick when you have to do that 10 times a day. In python I would just click "run" and that's it.

Is there anyway to check the output on vs code without having to set up the whole thing?

In vscode, you can “run” (on my machine, you use F5) the code and the output will appear in the terminal. You can also just write “node yourFile.js” in the terminal either in vscode or in bash, and Bob is your mother’s brother.

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Repl.it If you install node js on your computer you can just run node file name.js and it will run. If you’re trying to also modify html files I believe code sandbox allows you to have index.html / css/ js file all in the browser

reddit.com › r/learnjavascript › 1 what is the best way to learn unit testing in javascript?

r/learnjavascript on Reddit: 1 What is the best way to learn unit testing in Javascript?

October 11, 2021 -

Hi all - I am a neophyte javascript programmer (~1 year of self taught + coding bootcamp experience), and I've been reading everywhere that unit testing is a useful skill to have as a working dev. I want to prepare myself well for my first dev job - so I was curious - what are some good resources for learning unit testing in javascript?

Thank you all!

Testing JavaScript course by Kent C Dodds I went with the standard testing package and it was worth every single penny.

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Tape, Jest, Mocha, Ava - jesus just as I thought I knew all of the JS names... Thanks for all of the replies! I'll give these resources a look

reddit.com › r/javascript › [askjs] technical test questions about javascript and related framework

r/javascript on Reddit: [AskJS] Technical test questions about javascript and related framework

November 27, 2023 -

Where can I find test questions about javascript or react js? I've applied for a job as a js fullstack developer and will have a technical test. Or, if any of you, as a user/interviewer, can you tell me some tips on which questions are most commonly asked? Please let me know

Just use Google. https://github.com/sudheerj/javascript-interview-questions The best advice I can give you is to not bullshit about things you don't understand, any interviewer with more experience than you will see right through it, and nobody wants to work with someone who can't admit they don't know everything.

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You can find a variety of JavaScript and React.js test questions on platforms like HackerRank, Frontend Lead, and CodeSignal. These sites offer a range of coding challenges that can help you prepare for your technical test. Additionally, you might want to check out other resources of Frontend Lead & FreeCodeCamp for more structured learning and practice questions. As a full-stack JS developer, here are some tips on commonly asked questions and topics to focus on: Be prepared to answer questions on closures, promises, async/await, scope, hoisting, event delegation, and prototype inheritance. Know the basics of React, including component lifecycle methods, hooks (useState, useEffect, useContext, etc.), state management (Redux, Context API), and JSX. Understanding how to structure a React application, component-based architecture, and the principles of clean code and design patterns is important. Expect to solve coding problems or build a small feature during your interview. Be familiar with writing unit tests using frameworks like Jest and React Testing Library. Good luck with your interview! Practice as much as you can, and remember to explain your thought process clearly during the technical test.

Find elsewhere

Google Bing Mojeek

reddit.com › r/learnjavascript › any online tests which we can give for javascript?

r/learnjavascript on Reddit: Any online Tests which we can give for JavaScript?

December 12, 2019 -

For example

Linkedin Assessment
AngelList JavaScript assessment https://angel.co/assessments

I just want to try these as prep tests for Interviews

EDIT - I want to practice questions on JavaScript concepts used while developing Software, Not LeetCode style questions

Go to gratisexam.com and search for JavaScript.

reddit.com › r/reactjs › how to properly learn testing in javascript/typescript in 2022

Code Wars is pretty good

r/reactjs on Reddit: How to properly learn testing in JavaScript/TypeScript in 2022

October 15, 2022 -

So, I want to get started with testing in JavaScript, but I don't know where to start, what is the common terminology that is used in Testing. There are so many frameworks and libraries like Vitest , Jest, Mocha, Chai etc and I am just confused that where should I get started.

Could you guys recommend a roadmap or tips as to where should I get started ?

First, read some blog posts about terminology - test pyramid, what is a test case, test suite etc. to learn the basic concepts. Read upon what to test and why testing with 100% coverage is not the most practical idea. For example https://kentcdodds.com/blog/the-testing-trophy-and-testing-classifications Next, my opinionated take is use react testing library with jest as a runner for unit tests and cypress for e2e and integration tests, as they are very popular tools. RTL is also very developer friendly. As a bonus I would recommend TDD tutorial by jetbrains on yt- it’s a webstorm presentation, but is applicable to other IDEs and shows good work flow imho https://youtu.be/OEr0ppEUIfQ

Start by reading through https://medium.com/welldone-software/an-overview-of-javascript-testing-7ce7298b9870 to get a sense of what the different kinds of testing tools are and what they're used for.

Web Toolkit Online

webtoolkitonline.com › javascript-tester.html

JavaScript Tester online

Run and test your JavaScript code securely with our 100% local online tool. No data is sent over the Internet – everything runs in your browser! Fast, simple, and secure.

reddit.com › r/javascript › how to learn software testing properly (mainly for js)?

r/javascript on Reddit: How to learn Software Testing Properly (mainly for JS)?

August 19, 2017 -

When I was going through a bunch of JS videos, I came across this video

https://www.youtube.com/watch?v=tvy0bSgwtTo

I want to learn How to write tests and Learn more about Software testing In general . How should I start

I suppose you can start with looking for some stuff from Roy Osherove, including his book on unit testing. I've also found one video(haven't watched it though): https://www.youtube.com/watch?v=dJUVNFxrK_4

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I encourage you to read/watch what you can from “uncle” Bob Martin to understand the long term benefits or to consider the “philosophical” aspects of it. https://blog.cleancoder.com

reddit.com › r/askprogramming › is it a common practice to test js code in a browser instead of node.js?

r/AskProgramming on Reddit: Is it a common practice to test JS code in a browser instead of Node.js?

September 12, 2022 -

I have code that works with DOM and I need to test it. Only practice I've seen is that tests being run from CLI or IDE (which in turn runs in CLI). But I've never seen tests that run in browser by opening something like index.html. Is it OK or is it a thing to run unit tests in a browser?

Yes, it's common practice to test frontend code in the browser. To automate your tests, look into a headless browser library like Puppeteer or Selenium .

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Normaly unit test are run with no browser but integration testing is done in the browser with tools like selenium.

Code Beautify

codebeautify.org › javascript-tester

Javascript Tester to test Javascript code online with Console

A JavaScript tester is a tool or platform that allows you to run and test JavaScript code. It can help debug and verify that your code is working as expected. Various JavaScript testers are available, including online code editors and standalone ...

reddit.com › r/javascript › how to write tests?

r/javascript on Reddit: How to write tests?

May 15, 2015 -

I literally have no idea where to start. I would like to, because I know it's best practice and it seems like a good thing to do, but I can't find any resources on getting started at a low enough level to be accessible for someone who has never written a test.

Does anyone know of anywhere I can read up?

Well, I once made a small example with Jasmine. Let's say we're creating a calculator: function add(a, b) { return a + b; } function subtract(a, b) { return a - b; } function multiply(a, b) { return a * b; } function divide(a, b) { if (b === 0) { throw new TypeError("The second parameter cannot be zero"); } else { return a / b; } } Then you could test it using Jasmine by doing this: describe("A calculator", function() { it("adds two numbers", function() { expect(add(5, 3)).toBe(8); expect(add(5, -3)).toBe(2); expect(add(-5, 3)).toBe(-2); expect(add(-5, -3)).toBe(-8); expect(add(5, 0)).toBe(5); expect(add(0, 5)).toBe(5); expect(add(0, 0)).toBe(0); }); }); The full example can be seen here: http://g00glen00b.be/wp-content/examples/jasmine-example/index.html (though the descriptions are not really good because it's not really explaining the behavior). However, keep in mind that Jasmine is just a testing framework, you can use the HTML runner for a simple example (like I did), but in practice you will have to use a test runner as well. A popular combination lately is the use of Karma (+ a build tool like Grunt or Gulp). But if your primary goal is to be able to test your code, then you should first take a look at a testing framework and then you can look at the other stuff. ;)

If you're really interested in going the TDD route, don't start by writing code. Start by writing a spec that describes, in plain English, exactly what you want the code to do. Take an add() example, you'd start by writing something like: This function should take two numbers as arguments, add them together and return the resulting sum. From that statement, you'd write your tests using Jasmine, Mocha, Karma...any of the frameworks that other people are looking to. You'd want to make sure you have tests to cover all the types of inputs you could send to the function. What happens when you pass in more than two arguments? What happens if you pass in stings of letters instead of numbers? Once your tests are written, run it and watch as all your tests fail. Then you go start writing your the code that implements your spec. As you add features, exception handlers, etc. you'll eventually get to the point where all the tests are passing. Then you move on to the next part if your spec, and start all over again.

reddit.com › r/frontend › how should i get started learning testing in javascript?

How should I get started learning testing in Javascript? : r/Frontend

May 28, 2022 - Familiarize yourself with the different types of tests: There are several types of tests that you can write in JavaScript, including unit tests, integration tests, and end-to-end (E2E) tests.

reddit.com › r/javascript › what's your go-to playground website when you want to quickly test something from your browser's js console?

r/javascript on Reddit: What's your go-to playground website when you want to quickly test something from your browser's JS console?

July 22, 2018 -

Everybody probably has that simple, lightweight and compliant website fires up for quickly validating a little piece of JS (whether it's DOM related or not), what's yours? What makes it your favorite for this purpose? Mine used to be httpbin.org, but it isn't anymore since they started AJAX loading some of the content which is annoying.

jsfiddle Because it has everything you need to test and share your code and it's intuitive (put your code, click run. done.)

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JS Bin - Collaborative JavaScript Debugging

JavaScript ES6 / Babel JSX (React) CoffeeScript Traceur TypeScript Processing LiveScript ClojureScript Convert to JavaScript

reddit.com › r/javascript › which testing framework do you recommend?

r/javascript on Reddit: Which testing framework do you recommend?

March 6, 2018 -

Most recently I was working with Jest, and I love how it gives you basically everything out of the box. However, it was noticeably slower than the Mocha/Sinon/Chai combination. I heard about Tape/Ava, but never got a chance to use them. Should I give them a try? I was wondering what are you guys using? What do you most love using? What do you recommend for unit tests, and what for E2E tests?

Jest for unit tests. Jest + supertest for Node.js API/e2e tests. Jest + puppeteer for e2e browser tests.