JavaScript is a powerful client-side scripting language used in modern web sites and web applications. In the hands of a skilled Web developers,  JavaScript can enhance the user experience and web site provide interactive and feature-rich components.

But although syntactically simple JavaScript is often difficult for writers because it runs in the environment: a Web browser.

Below you’ll find tools for unit testing and validation tools to test your scripts in Various situations

JSLint

JSLint is a Web-based tool for verifying your JavaScript code for errors. It has a ton of features and settings that you can use to customize verification algorithms to suit your needs.

JsUnit

JsUnit is a Unit Testing framework for client-side (in-browser) JavaScript. It is essentially a port of JUnit to JavaScript. Also included is a platform for automating the execution of tests on multiple browsers and mutiple machines running different OSs. Its development began in January 2001.

J3Unit

J3Unit is an object-oriented unit testing framework for JavaScript. J3Unit runs JavaScript tests directly in the web browser and can be automated using JUnit and Jetty. J3Unit builds on previous work by JSUnit and Script.aculo.us to provide a better way to automate JavaScript unit tests. Object-oriented JavaScript unit tests are written using the Script.aculo.us Test.Unit.Runner object, which is in turn built upon the prototype JavaScript library.

Crosscheck

Crosscheck is an open source testing framework for verifying your in-browser javascript. It helps you ensure that your code will run in many different browsers such as Internet Explorer and Firefox, but without needing installations of those browsers. The only thing you need is a Java Virtual Machine.

YUI Test

YUI Test is a testing framework for browser-based JavaScript solutions. Using YUI Test, you can easily add unit testing to your JavaScript solutions. While not a direct port from any specific xUnit framework, YUI Test does derive some characteristics from nUnit and JUnit.

Regular Expression Tool

The Regular Expression Tool is an online utility that allows you to test your RegEx code against a sample test. It’s a handy tool to have around when you want to quickly test the efficacy of your regular expressions in a variety of example texts.

JSLitmus

JSLitmus is a lightweight tool for creating JavaScript benchmarks and performance tests, using an intuitive API.

JavaScript Regular Expression Tester

This handy utility program tests JavaScript Regular Expressions in a browser using JavaScript. Its interface is similar to other regular expression test tools, but unlike those tools, it tests JavaScript’s implementation of Regular Expression in JavaScript.

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