JavaScript: Validate whether a given value type is error or not

Last update on March 06 2025 11:07:05 (UTC/GMT +8 hours)

JavaScript validation: Exercise-2 with Solution

Validate Error

Write a JavaScript function to validate whether a given value type is an error or not.

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript function to validate whether a given value type is error or not</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function is_Error(input) {
   return input instanceof Error || toString.call(input) === '[object Error]';
}

console.log(is_Error(new Error('foo')));
console.log(is_Error(100));
console.log(is_Error('foo'));

Sample Output:

true
false
false

Flowchart:

Live Demo:

For more Practice: Solve these Related Problems:

Write a JavaScript function that determines if a given value is an instance of the Error class.
Write a JavaScript function that checks if a value’s constructor name is "Error" and returns a boolean.
Write a JavaScript function that verifies whether a value is a built-in error type (e.g., TypeError, ReferenceError) using instanceof.
Write a JavaScript function that accepts an array of values and extracts only those that are errors.

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