There are different types of errors thrown from JavaScript, So we need to know few things to understand about the error.

• What type of error it is?
• Error description or cause or error
• Location of error and its stack trace

In this brief post, we'll discuss the same.

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How to handle error from Crash?

Error handling is a technique, which every programmer should learn and use while coding. The most important error handling in JavaScript is wrapping all code logics inside the try block and handling exceptions in the catch block.

try {
    JSON.parse('Non JSON string'); 
} catch (error) {
    console.log(error); 
}

Types of Errors

Corresponding error instance has been created which represeting an error when it occurs:

• URIError - encodeURI() or decodeURI() are passed invalid parameters.
• EvalError - Regarding the global function eval()
• TypeError - A variable or parameter is not of a valid type
• RangeError - Anumeric variable or parameter is outside of its valid range
• SyntaxError - Interpret syntactically invalid code
• InternalError - An internal error in the JavaScript engine is thrown. Eg "too much recursion"
• ReferenceError - Dereferencing an invalid reference

Error Description of error

The description contains the error message string associated with a specific error. Understand the message explained briefly in the error description to fix the error.

Location of error and its stack trace

The location of the error and its stack trace helps the developer to trace the error file location with the exact line number and the cursor position.

In the above image

• JSON.parse('Non JSON string'); => Code Block
• SyntaxError => Error Type
• Unexpected token N in JSON at position 0 => Error Description
• at JSPN.parse () => Stacktrace
• index.js:4 => Error location

So how to throw a custom error?

// SYNTAX
new ErrorType([message[, fileName[, lineNumber]]]);

// EXAMPLE
throw new ReferenceError('Hello', 'file.js', 10);

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