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Lodash _.defaultsDeep() Method - GeeksforGeeks

Last Updated : 15 Jul, 2025

Lodash _.defaultsDeep() method recursively assigns default properties. It is almost the same as the _.defaults() function. This method mutates the object.

_.defaultsDeep(object, [sources]);

• object: This parameter holds the destination object.
• sources: This parameter holds the source objects.

This method returns the object.

Example 1: In this example, we are using the -.defaultsDeep() method for setting the source's value to the original object.

// Requiring the lodash library  
const _ = require("lodash");

// Given object
let info = {
    Name: "GeeksforGeeks",
    password: "gfg@1234",
    username: "your_geeks"
}

// Use of _.defaultsDeep() method
console.log(_.defaultsDeep(info,
    _.defaults(info, { id: 'Id97' })));

Output:

{
  Name: 'GeeksforGeeks',
  password: 'gfg@1234',
  username: 'your_geeks',
  id: 'Id97'
}

Example 2: In this example, we are using the -.defaultsDeep() method for setting the source's value to the original object.

// Requiring the lodash library  
const _ = require("lodash");

// Use of _.defaultsDeep() method
console.log(_.defaultsDeep(
    {
        'x': { 'y': 20 }
    },
    {
        'x': { 'y': 10, 'z': 30 }
    }
)
);

Output:

{ 'x': { 'y': 20, 'z': 30 } }

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