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You learned a lot about the Javascript syntax, the core Javascript features and how to write amazing

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Javascript driven applications, both on the frontend

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so in the browser, as well as with Node.js on the server side.

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Now one topic we haven't really touched on thus far or haven't read talked too much about is security

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and of course security matters. In this module,

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I want to highlight what you should watch out for when writing Javascript code and some common pitfalls

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or some important things you need to keep in mind

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to ensure that your code is secure and you're not exposing security relevant data or anything like that

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in your scripts and so on. Specifically, we'll have a look at potential security holes and things to watch

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out for when writing Javascript code, I'll of course also let you know how you can protect your code

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or which steps you can take to ensure your code is protected.

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We'll have a look at some common attack patterns or security concepts like CORS which I already talked

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about but which I will repeat here,

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CSRF and most importantly XSS which stands for cross site scripting attacks and I'll also have

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a look at npm packages or third-party libraries in general again because these as it turns out can also

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lead to security issues.

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So now let's not waste any time and

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let's have a look at what you should be aware of and how you can secure your code.