How to Build Custom Lodash for String Utilities

This guide outlines the process of generating a custom, lightweight build of the Lodash JavaScript library containing exclusively string utilities using the Lodash Command Line Interface (lodash-cli). Creating a specialized build removes unnecessary methods, drastically reduces file size, and ensures your application only loads the string manipulation functions it requires.

Step 1: Install the Lodash Command Line Interface

The Lodash build system relies on lodash-cli. You can run it directly using npx or install it globally via npm:

npm install -g lodash-cli

Step 2: Generate the Build by Category

Lodash groups its functions into categories, including "string". To generate a custom file that bundles every method in the string category, run the CLI tool and target the category="string" flag:

npx lodash-cli category="string" -o ./lodash.string.js

This command creates a single file (lodash.string.js) containing string utilities such as camelCase, kebabCase, pad, snakeCase, trim, truncate, and words.

Step 3: Build Specific String Functions (Alternative)

If you do not need every string function in the category and want to optimize bundle size even further, use the include argument to specify the exact functions you need:

npx lodash-cli include="camelCase,kebabCase,trim,truncate" -o ./lodash.string.js

The CLI automatically includes all internal dependencies and helper utilities required for those selected methods to function properly.

Step 4: Generate a Minified Build for Production

To create a production-ready, minified version, append the -m (or --minify) flag to your command:

npx lodash-cli category="string" -m -o ./lodash.string.min.js

Step 5: Import the Custom Build

Once the file is generated, import it directly into your JavaScript or TypeScript codebase:

ES Module syntax:

import _ from './lodash.string.min.js';

const result = _.camelCase('hello world');

CommonJS syntax:

const _ = require('./lodash.string.min.js');

const result = _.kebabCase('Hello World');

Modern Alternative: Direct Submodule Imports

If you are using modern bundlers like Webpack, Rollup, or Vite, you can bypass generating a custom file altogether by importing individual string utilities directly:

import camelCase from 'lodash/camelCase';
import kebabCase from 'lodash/kebabCase';

Alternatively, you can install lodash-es to take advantage of native ES module tree-shaking:

import { camelCase, kebabCase } from 'lodash-es';