check-if-a-value-is-a-plain-object.mdx

category	created	title	updated
Validator	2020-05-13	Check if a value is a plain object	2021-10-13

JavaScript version

const isPlainObject = (v) => !!v && typeof v === 'object' && (v.__proto__ === null || v.__proto__ === Object.prototype);

TypeScript version

const isPlainObject = (v: any): boolean =>
    !!v && typeof v === 'object' && (v.__proto__ === null || v.__proto__ === Object.prototype);

Examples

isPlainObject(null); // false
isPlainObject('hello world'); // false
isPlainObject([]); // false
isPlainObject(Object.create(null)); // false
isPlainObject(function () {}); // false

isPlainObject({}); // true
isPlainObject({ a: '1', b: '2' }); // true