# toss/es-toolkit

A modern JavaScript utility library that's 2-3 times faster and up to 97% smaller, a major upgrade to lodash.

Repository: https://github.com/toss/es-toolkit
Canonical: https://ross.abutalabs.com/products/es-toolkit
Homepage: https://es-toolkit.dev
Language: TypeScript
License: MIT
License Family: permissive
Last push: 2026-08-26T11:46:27+00:00

## Health v2 (maintenance only)
Score: 91/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 98, longevity 61
- inputs: {"age_days": 860, "days_push": 7, "days_rel": 17, "gap_med": 8.0, "n_releases_24m": 55}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 11315, forks 604 (observed 2026-08-28T04:10:46.719032+00:00)

## What it is
es-toolkit is a modern, high-performance JavaScript utility library offering everyday functions like debounce, chunk, and pick with built-in TypeScript types. It is designed as a faster, smaller drop-in alternative to lodash, with a full compatibility layer (es-toolkit/compat).

## Use cases
- replace lodash with a smaller faster utility library
- debounce and throttle functions in javascript
- manipulate arrays and objects with utility functions
- reduce javascript bundle size from utility imports
- use typed utility functions in a typescript project
- get type guard helpers like isNotNil

## When to choose
- you want a lodash replacement with 2-3x better performance and up to 97% smaller bundles
- you need strong TypeScript types and type guards out of the box
- you run modern JavaScript environments (Node.js, Deno, Bun, browsers) and want tree shaking

## When to avoid
- you depend on deep lodash-specific edge-case behavior outside the compat layer
- you need utilities beyond the provided array, function, math, object, predicate, promise, and string categories

## Facets
- artifact type: library
- maturity: active
- function: developer-tools
- domain: developer-tools, web-development, frontend, cross-platform
- platform: bun, browser, cross-platform
- tags: utility-library, lodash-alternative, typescript, tree-shaking, performance, nodejs, deno

## Member repositories
- toss/es-toolkit (main) score 91

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:46.719032+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:15:57.860109+00:00, confidence not recorded.
  - readme: https://github.com/toss/es-toolkit (fetched 2026-08-28T04:10:46.719032+00:00, sha 267e0ad6c025)
  - homepage: https://es-toolkit.dev (fetched 2026-08-29T08:14:55.053101+00:00, sha fdf2d70786dd)
  - site_page: https://es-toolkit.dev/intro.html (fetched 2026-08-29T08:14:55.096108+00:00, sha 03ff58837791)
- Data as of 2026-08-30T08:39:29.467469+00:00.