JavaScript validation that works both on client and Node.js server?

Question

What are my options for using the same JavaScript code to validate both on client side and on server side (Node.js)?

I ended up writing my own validation. Basically I have a model e.g. Person that has validation on it. This Person model exists both on the client and the server. When a user enters details on my FORM, I populate the Person object and validate it, giving feedback to incorrect fields. Once the form is POSTed back the the server, I re-populate the Person object and re-validate with the values received from the client. If there is an error, I just send it back to the client. This way I can re-use the same model both on client and server, run unit tests and show errors with jquery. — Hidden
– Hidden, Commented Feb 6, 2012 at 15:36

staackuser2 · Accepted Answer · 2011-11-26 00:42:29Z

9

Take a look at revalidator. It is described as "A cross-browser / node.js validator used by resourceful and flatiron."

answered Nov 26, 2011 at 0:42

staackuser2

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austincheney · Accepted Answer · 2011-11-25 21:59:25Z

-15

None, you are validating entirely different criteria on the server-side. Client-side validation is purely user-acceptance criteria and has nothing to do with security. Server-side validation almost exclusively concerned with security.

answered Nov 25, 2011 at 21:59

austincheney

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4 Comments

Hidden Over a year ago

I disagree. Ignoring XSS and other injection, I still want to validate that a form field is X characters long and is a post code. Otherwise there would be nothing stopping me going into Firebug and changing the values submitted to the server. And using JavaScript both on the client and on the server would mean code re-use. It would be silly not to.

austincheney Over a year ago

XSS and other injection vulnerabilities cannot be ignored, so your point is irrelevant.

rgbrgb Over a year ago

I think his point seems valid. I want to verify that an email is an email on both the client and the server without writing the exact same code in the exact same language twice. See this rails gem for an example: github.com/bcardarella/client_side_validations

fatuhoku Over a year ago

I agree with @Underworld: You want - client-side validation for rapid user feedback and enhanced user interface - server-side validation for e.g. ensuring junk/malicious code doesn't get passed to your database

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