![]() ![]() This means that our application may not be compatible with all browsers, and we’ll have errors to fix. Check Cross-Browser CompatibilityĪs I said before, each browser responds to JavaScript differently. Some developer tools also let us check if our web design is responsive to mobile devices.ĭeveloper tools are useful for checking JavaScript errors as well as:Īnd many more, depending on the in-browser developer tool. Begin looking at the various elements or console tools to find some errors to fix. To get started, just open up your favorite browser with developer tools, then find the developer tools in the browser menu. In 2019, Firefox and Chrome were the two most popular browsers with developers. Now I use whichever browser suits my needs at the moment-Firefox, Chrome, Safari, Microsoft Edge, Opera, or Brave. Previously, when I was a young developer, I would use Firefox separately to browse the web projects that I was developing. Use In-Browser Developer Toolsīy far the most useful tools at our disposal for fixing JavaScript errors are the in-browser developer tools. Now that we’ve covered the basics, let’s move on to some things that are more advanced. We can enable or disable pop-up boxes from either our browser settings or an add-on that we’re using. Similarly, we can check whether we have a pop-up blocker enabled that’s preventing parts of our JavaScript from working, such as our use of alert boxes. If you’re not sure, you can quickly check here to see if your browser’s JavaScript is turned on. That doesn’t sound good, does it? Hence, turning JavaScript off avoids security issues but will obviously cause errors when you’re running an application with JavaScript. For example, Twitter was injected by malware called the “StalkDaily” worm. So we must check our browser settings to see if JavaScript is turned on.Ĭross-site scripting (XSS) is one vulnerability in JavaScript that allows hackers to inject malicious code into legitimate websites. For example, JavaScript has some security holes, and hackers may put malicious code in some JavaScript thus, for safety reasons, JavaScript is often turned off in some browsers. Furthermore, JavaScript reacts differently depending on each browser and how each user’s settings are set for their browsers. We must keep in mind that JavaScript is set differently for each browser. Then we can move on to checking for JavaScript errors in further detail. This may or may not be caused by a JavaScript error-either way, don’t panic and just reload the page. Google Chrome sometimes displays an “Aw, Snap!” error when it has difficulty running our web page. It may also help to delete your browser history and cache in case your browser is saving a bad version of your website or application. Maybe we already solved this error and the file hasn’t uploaded yet or some data was missing. ![]() It’s the classic IT crowd solution to everything-turn it on and off again. Sometimes the simplest thing we can do is reload the web page. Since we know the two main types of JavaScript errors, we can swiftly move on to fixing them. Consequently, runtime errors can be a bit trickier to fix than syntax errors. Other times, our program can run but the result isn’t as we planned it. Sometimes there’s a problem with our logic flow and our program breaks, like calling strings that aren’t there. ![]() Certainly, through time, our syntax errors will become fewer as we become experts in JavaScript, but simple mistakes do happen a lot.Ī runtime error prevents our application from actually running. Syntax errors mostly come in the form of misspelled keywords, missing or open brackets, or missing parentheses or punctuation. ![]() Namely, with JavaScript, most of our errors fit into two categories: syntax errors and runtime errors.Ī syntax error is a problem with the grammar in our code. We need to know what type of error we’re receiving to know what we need to do to fix it. Know the Different Types of JavaScript Errors ![]()
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