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What are my options for using the same JavaScript code to validate both on client side and on server side (Node.js)?
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Doing input validation on both the client side and server side has a number of benefits: It helps reduce server load since invalid data is never submitted in the first place. It helps prevent malicious users from submitting invalid data.
Validations can be performed on the server side or on the client side ( web browser). The user input validation take place on the Server Side during a post back session is called Server Side Validation and the user input validation take place on the Client Side (web browser) is called Client Side Validation.
If by the above you understand moving validation to server side, then yes, it is definitely possible.
Scripting languages such as JavaScript and VBScript are used for client-side validation. In this kind of validation, all the user input validation is done in user's browser only.
Take a look at revalidator. It is described as "A cross-browser / node.js validator used by resourceful and flatiron."
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