When executing JavaScript code, errors will definitely occur. These errors can occur due to a fault from the programmer’s side or the input is wrong or even if there is a problem with the logic of the program.

There are three types of errors in programming: (a) Syntax Errors, (b) Runtime Errors, and (c) Logical Errors.

Syntax Errors:

Syntax errors, also called parsing errors, occur at compile time in traditional programming languages and at interpret time in JavaScript. When a syntax error occurs in JavaScript, only the code contained within the same thread as the syntax error is affected and the rest of the code in other threads gets executed assuming nothing in them depends on the code containing the error.

Runtime Errors:

Runtime errors, also called exceptions, occur during execution (after compilation/interpretation). Exceptions also affect the thread in which they occur, allowing other JavaScript threads to continue normal execution.

Logical Errors:

Logic errors can be the most difficult type of errors to track down. These errors are not the result of a syntax or runtime error. Instead, they occur when you make a mistake in the logic that drives your script and you do not get the result you expected. You cannot catch those errors, because it depends on your business requirement what type of logic you want to put in your program.

The latest versions of JavaScript added exception handling capabilities. JavaScript implements the try…catch…finally construct as well as the throw operator to handle exceptions.