WebGoat/webgoat/main/project/WebContent/lesson_plans/JavaScriptValidation.html

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<p><b>Lesson Plan Title:</b> How to Bypass Client Side JavaScript Validation </p>
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<p><b>Concept / Topic To Teach:</b> </p>
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Client-side validation should not be considered a secure means of validating parameters. These validation only help reduce the amount of server processing time for normal users who do not know the format of required input. Attackers can bypass these mechanisms easily in various ways. Any client-side validation should be duplicated  on the server side. This will greatly reduce the likelyhood of insecure parameter values being used in the application.
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<p><b>General Goal(s):</b> </p>
For this exercise, the web site requires that you follow certain rules when you fill out a form. The user should be able to break those rules, and send the website input that it wasn't expecting. <br>