This course has been updated! We now recommend you take the JavaScript Performance course.

Check out a free preview of the full Website Performance course:
The "Data Validation" Lesson is part of the full, Website Performance course featured in this preview video. Here's what you'd learn in this lesson:

Often times data validation rules are written twice: Once on the client, and once on the server. A performance goal would be to have these rules written once. One way to achieve this would be with a middle-end written in server-side JavaScript.

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