lodash

library4.18.1jsnpm✓ verified 32d ago

lodash is a JavaScript utility library providing consistent, cross-environment, performance-optimized, and modular utilities for common programming tasks. It simplifies working with arrays, objects, numbers, strings, and functions, offering a wide range of helpers for iteration, manipulation, and type checking. The current stable version is 4.18.1, with frequent updates for bug fixes and security patches, typically released as minor or patch versions.

serialization data

npm install lodash

github ↗package ↗homepage ↗

INSTALL

IMPORT

SIG · LODASH

lodash

serializationjavascriptv4.18.1

Install

900ms avg

Import

13ms

Disk

5MB

Pass rate

6/ 6

Env Coverage6 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v4.18.1 · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–223 runs

installs and imports cleanly · install 0.0s · import 0.017s · 4.9MB

glibc

node 18–223 runs

installs and imports cleanly · install 0.9s · import 0.010s · 5MB

5MB installed

● package 5MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

✓ import _ from 'lodash';

✗ const _ = require('lodash');

The 'lodash' package supports both CommonJS and ESM imports. For optimal tree-shaking in modern bundlers, consider using 'lodash-es'.

Demonstrates importing the full lodash library and using the `_.filter` method to process an array of objects.

import _ from 'lodash'; const users = [ { 'user': 'barney', 'age': 36, 'active': true }, { 'user': 'fred', 'age': 40, 'active': false } ]; const activeUsers = _.filter(users, function(o) { return o.active; }); console.log(activeUsers); // Expected output: [ { user: 'barney', age: 36, active: true } ]

Debug

Known issues

breakinglodash v4.0.0 introduced significant back-compatible breaking changes to align with semantic versioning practices.

fix

Consult the [v4.0.0 Changelog](https://github.com/lodash/lodash/wiki/Changelog#v400) for migration details.

affects: >=4.0.0

breakinglodash v3.0.0 included several back-compatible breaking changes as part of a major cleanup and refactoring.

fix

Consult the [v3.0.0 release notes](https://github.com/lodash/lodash/tree/3.0.0) for migration details.

affects: >=3.0.0

gotchaA prototype pollution vulnerability via `_.unset` and `_.omit` path traversal was fixed.

fix

Upgrade to `lodash@4.18.0` or higher to address security vulnerability GHSA-f23m-r3pf-42rh.

affects: <4.18.0

gotchaA `ReferenceError` could occur when using `_.template` or `_.fromPairs` from modular builds due to internal dependency issues.

fix

Upgrade to `lodash@4.18.1` or higher to resolve this `ReferenceError`.

affects: 4.18.0

gotchaLodash functionality in the Node.js REPL may be inconsistent or require a polyfill for Node.js versions prior to 6.

fix

Install `n_` (`npm i -g n_`) for Node.js < 6 REPL support, or use Node.js v6 or higher.

affects: Node.js < 6

Errors

Common errors & fixes

ReferenceError: <variable name> is not defined

Internal dependency mapping issue in `_.template` or `_.fromPairs` functions when imported individually or from modular builds in versions prior to 4.18.1.

fix

Upgrade `lodash` to version `4.18.1` or higher.

TypeError: require is not a function

Attempting to use CommonJS `require` syntax within an ES Module (ESM) file context.

fix

Refactor `const _ = require('lodash');` to `import _ from 'lodash';` for ESM compatibility.

SyntaxError: Cannot use import statement outside a module

Attempting to use ES Module `import` syntax within a CommonJS (CJS) file context or a project not configured for ESM.

fix

Refactor `import _ from 'lodash';` to `const _ = require('lodash');` for CJS compatibility, or configure your project to use ES Modules (e.g., by setting `"type": "module"` in `package.json`).

Upgrade

Version history

4.18.1latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

46 hits · last 30 days

node

Resources

githubhttps://github.com/lodash/lodash ↗

packagehttps://www.npmjs.com/package/lodash ↗

homepagehttps://lodash.com ↗