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Event Listener - pauses on the code that runs right after an event is fired, say click or specific categories of events (all mouse related).ДЇrom the same Sources panel, you can save your repetitive code into Snippets.XHR - triggered when the requested URL contains a specific string.DOM - when a node or its children gets changed or removed.Other types of breakpoints are available: Console has access to the application state, use it to change values and to keep an eye on your console.log() messages.Watch a specific variable by tracking its value over time.You can change their values and see how it affects your application upon resuming execution. Scope pane is where all your local, global and closure (when applicable) variables get printed.Check the callstack and see what functions are called and their order.Step through the code by resuming execution, one line at a time, or hop on to the next function call.From there you can deep dive into your code using the different options at hand: And you can set many of them at the same time. The execution comes to a halt as soon as it reaches the breakpoint. It allows for quick inspection of the piece of code being executed and the values of all variables at that moment in time. This a faster and cleaner alternative to using console.log() when looking for bugs. This is by far the most powerful tool available in DevTools, and you can find it under the Sources tab. Tips: Hit Preserve log to keep the logs when navigating from one page to another, and check Disable cache so resources wonвЂ™t be served from cache when DevTools is open. ItвЂ™s in fact easier to debug the received data or simply inspect images here than in your HTML source code.ДЄnd finally the Timing breakdown which can prove very useful when investigating requests that take a long time to download, either due to a poor connection between your Angular application and the server (consider using a CDN if Time To First Byte is high) or to a slow backend if that server is hosted locally. If youвЂ™re looking for CORS issues, itвЂ™s better to start from Console then eventually switch to Network (these requests appear in white, as successful).Д¬licking on a specific resource opens a detailed panel where HTTP Headers are shown, alongside the Response and even an HTML Preview of it. This list view helps easily spot requests that failed (the red ones) and those that are pending and may soon timeout. The footer contains a summary of the total number of requests and the size of all resources. These resources are listed chronologically with information such as HTTP response code, loading time, initiator, state and size. All resources, whether downloaded or uploaded, are available for inspection in the Network panel. This where your entire applicationвЂ™s network activity will be logged. In other words, you can use it to run custom JavaScript code that interacts with your Angular application.

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On top of that, your Console is a REPL environment and has full access to window. See console JS object to learn what you can do with it. Warnings and the majority of runtime errors get also printed here.

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The Console serves two objectives at least: display of your applicationвЂ™s logs plus runtime errors and ability to execute custom JS code.Дevelopers may be logging messages using console.log() to inspect the value of some variable or simply ensure their code is executing in the right order. The good old вЂњinspectorвЂќ will boost your productivity when it comes to debugging JavaScript, tweaking DOM and CSS, inspecting network activity, analyzing performance, tracking down memory leaks and much more. List all modules that the application is using and check their providers and exports.ДЄngular Augury is definitely a big plus, but the best debugging tool comes already bundled with your browser.Browse the routing system, track lazy-loaded components and see navigation flows.Manipulate a componentвЂ™s properties, visualize its hierarchy and see its dependencies.Inspect the source code of a component and insert breakpoints.One of the most popular extensions-for debugging and profiling Angular apps-is definitely Augury, available on both Firefox and Chrome.ДЄugury gives a visual representation of Angular components alongside their dependencies and router details.

(Most of the learnings here are applicable to all frontend applications) Angular Debugging Tools Besides, what better way of deeply understanding a language or framework if not by looking at its inner workings. WeвЂ™ll be covering some of the tactics and DevTools Angular developers use for debugging their applications, not only in their very predictable development environment, but also in production when their code comes to life and things may go sideways.

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