A scriptable browser like PhantomJS, based on Firefox.  SlimerJS is useful to do functional tests, page automation, network monitoring, screen capture, web scraping etc. It provides support to load a web page and inspect its content. It can act on a web page like a user: click on links, fill in form fields etc. You can then inspect the results, to test them or to retrieve them. It helps to take screenshots of a web page.

Slimerjs - A scriptable browser like PhantomJS, based on Firefox

Memorable site for testing clients against bad SSL configs. 

badssl.com - Memorable site for testing clients against bad SSL configs

MailDev is a simple way to test your project's generated emails during development with an easy to use web interface that runs on your machine built on top of Node.js.
 Features: 
<ul>
 <li>Toggle between HTML, plain text views as well as view the source or email headers</li>
 <li>Test Responsive Emails w/ resizeable preview pane available for 320/480/600px viewports</li>
 <li>Receive and view email attachments</li>
 <li>New emails appear instantly in interface when received (via Websockets)</li>
 <li>Command line interface for configuring SMTP and Web interface ports</li>
 <li>Ability to relay email to an upstream SMTP server (like Gmail)</li>
 <li>Export .eml files</li>
 </ul>

MailDev is a simple way to test your project's generated emails during development with an easy to use web interface that runs on your machine built on top of Node.js.

MailDev - SMTP Server + Web Interface for viewing and testing emails during development

Localtunnel exposes your localhost to the world for easy testing and sharing! No need to mess with DNS or deploy just to have others test out your changes.Great for working with browser testing tools like browserling or external api callback services like twilio which require a public url for callbacks.

Localtunnel - Expose yourself to the world


Polly.JS is a standalone, framework-agnostic JavaScript library that enables recording, replaying, and stubbing of HTTP interactions. By tapping into multiple request APIs across both Node & the browser, Polly.JS is able to mock requests and responses with little to no configuration while giving you the ability to take full control of each request with a simple, powerful, and intuitive API.
 
It helps to record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests. You can use Polly's client-side server to modify or intercept requests and responses to simulate different application states (e.g. loading, error, etc.).

Polly.JS is a standalone, framework-agnostic JavaScript library that enables recording, replaying, and stubbing of HTTP interactions. By tapping into multiple request APIs across both Node & the browser, Polly.JS is able to mock requests and responses with little to no configuration while giving you the ability to take full control of each request with a simple, powerful, and intuitive API.

Polly.JS - Record, Replay, and Stub HTTP Interactions

PhantomJS is a headless WebKit scriptable with a JavaScript API. It has fast and native support for various web standards: DOM handling, CSS selector, JSON, Canvas, and SVG. It is an optimal solution for headless website testing. It run functional tests with frameworks such as Jasmine, QUnit, Mocha, Capybara, WebDriver, and many others. 
 
It is capable to do screen capture. It could create web site screenshots with thumbnail preview. Automates performance analysis using YSlow and Jenkins.

PhantomJS is a headless WebKit scriptable with a JavaScript API. It has fast and native support for various web standards: DOM handling, CSS selector, JSON, Canvas, and SVG. It is an optimal solution for headless website testing. It run functional tests with frameworks such as Jasmine, QUnit, Mocha, Capybara, WebDriver, and many others.  

Phantomjs - Headless WebKit with JavaScript API

Protractor is an end-to-end test framework for Angular and AngularJS applications. Protractor runs tests against your application running in a real browser, interacting with it as a user would. 

Protractor - End to End test framework for Angular apps

Jest is a delightful JavaScript Testing Framework with a focus on simplicity. It works with projects using: Babel, TypeScript, Node, React, Angular, Vue and more. It provides instant feedback, fast interactive watch mode runs only test files related to changed files and is optimized to give signal quickly.

Jest - Delightful JavaScript Testing

Puppeteer is a Node library which provides a high-level API to control Chrome or Chromium over the DevTools Protocol. Puppeteer runs headless by default, but can be configured to run full (non-headless) Chrome or Chromium. Most things that you can do manually in the browser can be done using Puppeteer! For example you can generate screenshots and PDFs of pages, Crawl a SPA (Single-Page Application) and generate pre-rendered content, Automate form submission, UI testing, keyboard input, etc.


Puppeteer - Headless Chrome Node API

CasperJS is a navigation scripting & testing utility for PhantomJS and SlimerJS (still experimental). It eases the process of defining a full navigation scenario and provides useful high-level functions, methods & syntactic sugar for doing common tasks such as Filling forms, Clicking links, Capturing screenshots of a page, Downloading resources, even binary ones, Writing functional test suites, exporting results as JUnit XML (xUnit) and lot more.

Casperjs - Navigation scripting and testing utility for PhantomJS and SlimerJS

Postman helps you be more efficient while working with APIs. Using Postman, you can construct complex HTTP requests quickly, organize them in collections and share them with your co-workers.

Postman -  Supercharge your API workflow

JSON Server is a full fake REST API with zero coding in less than 30 seconds Created with <3 for front-end developers who need a quick back-end for prototyping and mocking.

json-server - Get a full fake REST API with zero coding in less than 30 seconds

CodeceptJS is a new testing framework for end-to-end testing with WebDriver (or others). It abstracts browser interaction to simple steps that are written from a user perspective. It is synchronous where you don't need to care about callbacks, or promises, test scenarios are linear. 
Run your tests via Playwright, WebDriver, Puppeteer, TestCafe, Protractor, Appium. The code is the same.
<ul>
<li>Based on <a href="https://mochajs.org/" rel="nofollow">Mocha</a> testing framework.</li>
<li>Designed for scenario driven acceptance testing in BDD-style</li>
<li>Uses ES6 natively without transpiler.</li>
<li>Also plays nice with TypeScript.</li>
<li>Smart locators: use names, labels, matching text, CSS or XPath to locate elements.</li>
<li>Interactive debugging shell: pause test at any point and try different commands in a browser.</li>
<li>Easily create tests, pageobjects, stepobjects with CLI generators.</li>
</ul>

CodeceptJS is a new testing framework for end-to-end testing with WebDriver (or others). It abstracts browser interaction to simple steps that are written from a user perspective. It is synchronous where you don't need to care about callbacks, or promises, test scenarios are linear. 
Run your tests via Playwright, WebDriver, Puppeteer, TestCafe, Protractor, Appium. The code is the same.

CodeceptJS - Supercharged End 2 End Testing Framework for NodeJS

CasperJS is a navigation scripting & testing utility for PhantomJS. It eases the process of defining a full navigation scenario and provides useful high-level functions, methods & syntaxic sugar for doing common tasks such as browsing navigation steps, 
filling & submitting forms, clicking & following links, capturing screenshots, logging events, etc

CasperJS - Navigation Scripting & Testing Utility for PhantomJS

Postman is a powerful HTTP client to help test web services easily and efficiently. Postman let's you craft simple as well as complex HTTP requests quickly. It also saves requests for future use so that you never have to repeat your keystrokes ever again.

Postman - A chrome addon, helps to test web services

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