JavaScript - get random property from object

In this article, we would like to show you how to get random property from object in JavaScript.

Practical example

In the below example, we use:

• Object.keys() method to get the object keys as an array,
• keys.length * Math.random() with Math.floor() to get a random key index within the range of the object keys number.

Runnable example:

// ONLINE-RUNNER:browser;

const randomProperty = (object) => {
    const keys = Object.keys(object);
    if (keys.length > 0) {
        const index = Math.floor(keys.length * Math.random());
      	const key = keys[index];
        const value = object[key];
        return {index, key, value}
    }
    return null;
};


// Usage example:

const object = {
    a: '1',
    b: '2',
    c: '3',
};

const property = randomProperty(object);

console.log(`key:   ${property.key}  `);
console.log(`value: ${property.value}`);

Random property name

// ONLINE-RUNNER:browser;

const randomPropertyName = (object) => {
    const keys = Object.keys(object);
    if (keys.length > 0) {
        const index = Math.floor(keys.length * Math.random());
      	return keys[index];
    }
    return null;
};


// Usage example:

const object = {
    a: '1',
    b: '2',
    c: '3',
};

console.log(randomPropertyName(object));

Random property value

// ONLINE-RUNNER:browser;

const randomPropertyValue = (object) => {
    const keys = Object.keys(object);
    if (keys.length > 0) {
        const index = Math.floor(keys.length * Math.random());
      	return object[keys[index]];
    }
    return null;
};


// Usage example:

const object = {
    a: '1',
    b: '2',
    c: '3',
};

console.log(randomPropertyValue(object));

See also

1. JavaScript - random element from stream of elements