Handling errors is the difference between professional application and one who left user staring at the frozen screen. In javascript things will go wrong - apis will fails, user will provide creative inputs, and variables will be undfined Here is the in depth guide to managing the chaos using try , catch , finally , and custom errors. Content List What errors are in JavaScript Using try and catch Blocks The finally Block Throwing Custom Errors Why Error Handling Matters What errors are in JavaScript Error is the object in javascript, when things goes wrong the JS throws this object. It contains name (a type or error), message (a human readable description), and a stack tracing (A GPS of code: provide location of error from it generate). If error did not chaught the js stops the entire exection of programm. There are some common built in errors types: ReferenceError: using variables that has not been declared. TypeError: performing operation on wrong data types.…