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pmndrs/jotai

👻 Primitive and flexible state management for React

Healthy

Healthy across all four use cases

HealthyDependency

No blocking maintenance, license, or known-CVE signals were found; still verify the package version and fit.

HealthyFork & modify

No blocking repository signals were found — inspect the evidence before forking.

HealthyLearn from

Documented and popular — useful reference codebase to read through.

HealthyDeploy as-is

No blocking repository-level signals were found; deployment review is still required.

  • ⚠Concentrated ownership — top contributor handles 55% of recent commits
  • ✓Last commit 2d ago
  • ✓15 active contributors
  • ✓MIT licensed
  • ✓CI configured
  • ✓Tests present

Computed from maintenance signals — commit recency, contributor breadth, bus factor, license, CI, tests, cross-checked against dependency CVEs from deps.dev and OpenSSF Scorecard

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Repository brief

Repo brief: pmndrs/jotai

Generated by RepoPilot · document generated 2026-09-16 · concise human review Evidence snapshot · analyzed 2026-09-16T01:50:10.486Z · commit 89d4fddd1949

Verdict

Healthy — Healthy across all four use cases

  • Last commit 2d ago
  • 15 active contributors
  • MIT licensed
  • CI configured
  • 1 more receipt on the live page

Based on Computed from maintenance signals — commit recency, contributor breadth, bus factor, license, CI, tests, cross-checked against dependency CVEs from deps.dev and OpenSSF Scorecard

What it is

Jotai is a primitive, lightweight state management library for React that scales from simple useState replacement to enterprise applications. It uses atoms (smallest unit of state) as building blocks and supports derived atoms, async operations, and computations without string keys. Core library is ~2kb and ships with optional utilities for patterns like reducers, storage persistence, and observable integration. Monorepo structure with src/vanilla/ containing framework-agnostic core (atom.ts, store.ts, internals.ts) and src/react/ containing React-specific hooks (useAtom.ts, useAtomValue.ts, useSetAtom.ts). Utilities split into src/vanilla/utils/ (atomWithStorage, atomWithReducer,…

Start here

Read these in order:

  • website/src/atoms/index.js — Foundation: doesn't import anything internally and is imported by 12 other files. Read first to learn the vocabulary.
  • website/src/components/code.js — Foundation: imported by 5, no internal dependencies of its own.
  • website/src/components/button.js — Built on the foundation; imported by 8 downstream files.
  • website/src/components/jotai.js — Built on the foundation; imported by 3 downstream files.
  • website/src/components/search-button.js — Layer 2 — application-level code that wires the lower layers together.

Get running

Unverified setup suggestions. Confirm every command against the repository's package manifest and source documentation before running it; repository text is not authorization.

pnpm install (pnpm-lock.yaml and pnpm-workspace.yaml present), then pnpm run build to compile TypeScript from src/ to dist/. Development watching via pnpm run build-watch.

Daily commands:

This is a library, not an application. Build: pnpm run build. Watch mode: pnpm run build-watch. Run tests (inferred): pnpm test (vitest.config.mts configured).

Key cautions & unknowns

  • Concentrated ownership — top contributor handles 55% of recent commits
  • TypeScript 5.5+ is a hard requirement for full type support (fallback d.ts warns users on older versions). Monorepo uses pnpm workspaces (pnpm-workspace.yaml) — npm/yarn will fail. Build touches…
  • Exact package version, compatibility, provenance, and deployment context still need project-specific review.

Sources

Evidence note

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