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Several years ago a co-worker showed me that it is far better to practice “safe-programming” by guarding against bad input.
In the long term this approach works out better for both customers and the developers, who must maintain the code.
It is important to validate the form submitted by the user because it can have inappropriate values. The Java Script provides you the facility the validate the form on the client side so processing will be fast than server-side validation.
So, most of the web developers prefer Java Script form validation.
The name can’t be empty and password can’t be less than 6 characters long. The user will not be forwarded to the next page until given values are correct.
Validating input is one of those programming necessities that we sometimes like to put off.
Input validation should happen as early as possible in the data flow, preferably as soon as the data is received from the external party.
Data from all potentially untrusted sources should be subject to input validation, including not only Internet-facing web clients but also backend feeds over extranets, from suppliers, partners, vendors or regulators, each of which may be compromised on their own and start sending malformed data.
Similar to the XML schema, which is written in pure XML format for validating XML, JSON schema is written in pure JSON format for validating JSON. There are almost 30 validator implementations written for Java, Ruby, C, C , Python, Java Script Perl and other languages.