util.isDeepStrictEqual

util.isDeepStrictEqual(val1, val2, options?): boolean

Returns true if there is deep strict equality between val1 and val2. Otherwise, returns false.

By default, deep strict equality includes comparison of object prototypes and constructors. When skipPrototype is true, objects with different prototypes or constructors can still be considered equal if their enumerable properties are deeply strictly equal.

const util = require('node:util');

class Foo {
  constructor(a) {
    this.a = a;
  }
}

class Bar {
  constructor(a) {
    this.a = a;
  }
}

const foo = new Foo(1);
const bar = new Bar(1);

// Different constructors, same properties
console.log(util.isDeepStrictEqual(foo, bar));
// false

console.log(util.isDeepStrictEqual(foo, bar, true));
// true

See assert.deepStrictEqual() for more information about deep strict equality.