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How to get Type of Exception in Javascript

To check if a variable is of type Error, use the instanceof operator - err instanceof Error. The instanceof operator returns true if the prototype property of a constructor appears in the prototype chain of the object.

const err = new Error('💣️ Something went wrong');
console.log(err instanceof Error); // 👉️ true

Note that this approach would also work if you create custom errors and extend the Error constructor.

class NotFoundError extends Error {
  constructor(message) {
    super(message); = 'NotFoundError';
    this.status = 404;

const err = new NotFoundError('product not found');

console.log(err instanceof Error); // 👉️ true
console.log(err instanceof NotFoundError); // 👉️ true


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