Disable form validation in browser

To disable validation in HTML5 use

<form method="post" action="/foo" novalidate>...</form>

Refer this question for more details.I think Junit can also help to test server side validations.
Use parameterized query to gain more security. (If SQL query is formed using user input).

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EDIT :

You can set it in About:flags
Steps:
1. On your Google Chrome address bar, type “about:flags” (without the quote) and press Enter.
2.Scroll down the list until you see the option “Disable HTML5 interactive form validation”.
3.Click the enable link.
Check : http://wikibin.org/articles/google-chrome-about-and-chrome-urls.html

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EDIT 2 :
Just came to know that About:flags is depreciated use Use chrome://flags instead. Thanks @Max.

This Chrome extension allows you to disable Chrome's built in HTML validation

HTML5 Form validation errors remover

It now requires novalidate="novalidate" as below:

<Form novalidate="novalidate" onSubmit={this.handleSaveFormSubmit}>

Just novalidate no longer works, and Chrome displays "Please fill out this field"