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Showing content from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_inequality below:

Strict inequality (!==) - JavaScript

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The strict inequality (!==) operator checks whether its two operands are not equal, returning a Boolean result. Unlike the inequality operator, the strict inequality operator always considers operands of different types to be different.

console.log(1 !== 1);
// Expected output: false

console.log("hello" !== "hello");
// Expected output: false

console.log("1" !== 1);
// Expected output: true

console.log(0 !== false);
// Expected output: true

The strict inequality operator checks whether its operands are not equal. It is the negation of the strict equality operator so the following two lines will always give the same result:

For details of the comparison algorithm, see the page for the strict equality operator.

Like the strict equality operator, the strict inequality operator will always consider operands of different types to be different:

"hello" !== "hello"; // false
"hello" !== "hola"; // true

3 !== 3; // false
3 !== 4; // true

true !== true; // false
true !== false; // true

null !== null; // false

"3" !== 3; // true
true !== 1; // true
null !== undefined; // true

const object1 = {
  key: "value",
};

const object2 = {
  key: "value",
};

console.log(object1 !== object2); // true
console.log(object1 !== object1); // false

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