DeepGet

DeepGet is a lightweight and safe utility for retrieving values from deeply nested JavaScript objects using dot and array notation. It ensures undefined safety, making object traversal hassle-free. Say goodbye to complex conditional checks and errors — DeepGet simplifies object traversal with ease.

Features

• Dot notation support – Access deep properties easily ("a.b.c").
• Array index notation – Retrieve array elements ("a.b.c[1]").
• Custom Separator Support - Use a custom separator instead of a single dot (".").
• Safe access – Prevents errors and returns undefined if the key either is invalid or missing.
• Lightweight – No third-party dependencies, minimal footprint.

Installation

npm install @mitsuki31/deepget

Usage

Import

CommonJS

const { DeepGet } = require('@mitsuki31/deepget');

ES Module

import DeepGet from '@mitsuki31/deepget';
// Or: import { DeepGet } from 'deepget';

TIP: For more simplicity naming purpose, you can do, for example:

import DeepGet as DG from '@mitsuki31/deepget';

Basic Usage

const obj = { a: { b: { c: 42, $1: 1 } } };

console.log(DeepGet(obj, "a.b.c"));   // 42
console.log(DeepGet(obj, "a.b.$1"));  // 1
console.log(DeepGet(obj, "a.x.y"));   // undefined

Array Index Notation

const obj = { a: { b: { c: [10, 20, 30, [ 'foo' ]] } } };

console.log(DeepGet(obj, "a.b.c[1]"));     // 20
console.log(DeepGet(obj, "a.b.c[5]"));     // undefined
console.log(DeepGet(obj, "a.b.c[3][0]"));  // foo

Using a Custom Separator

const obj = { a: { b: { c: 42 } } };
console.log(DeepGet(obj, "a::b::c", { sep: "::" })); // 42

API

Refer to the Homepage for detailed APIs information.

Why Use DeepGet?

• Prevents runtime errors: No need for manual if checks.
• Handles missing values gracefully: Avoids TypeError: Cannot read property ... of undefined.
• Intuitive dot and array notation: Access nested data effortlessly, also support nested arrays.

License

Licensed under the MIT License.