# Effect

TypeScript library for building production-grade applications, with typed errors, dependency injection, concurrency, scheduling and schema validation.

STUB. This software has no release or pre-release in four years, or its project site no longer shows it, so it is not part of the register, not counted and not indexed. It will be checked again.

Source: https://findsoftware.frbit.cloud/effect/
Last reviewed: 2026-11-08
Listed since: 2026-11-08

## Record

### Links

- home: https://effect.website
- repository: https://github.com/Effect-TS/effect
- docs: https://effect.website/docs/v4/onboarding
- x: https://x.com/EffectTS_
- bluesky: https://bsky.app/profile/effect-ts.bsky.social
- discord: https://discord.gg/effect-ts
- youtube: https://www.youtube.com/@Effect-TS

### Identity

- status: stub
- maintainer: Effectful Technologies Inc
- maintainerType: company
- parent: unknown
- firstRelease: unknown
- hqCountry: unknown

### Kind

- category: library
- hosting: node, deno, bun
- language: javascript
- runtime: node, deno, bun
- runtimeMin: unknown
- basedOn: unknown

### Content

- contentStore: not applicable
- databases: not applicable
- adminUi: not applicable
- headlessApi: not applicable
- templating: not applicable
- i18n: not applicable

### Rendering and deploy

- runsAs: not applicable
- renderingModes: not applicable
- installMethod: unknown

### License

- licenseModel: open-source
- license: MIT

### Releases

- currentMajor: 4
- latestReleaseDate: 2026-11-02

### Adoption

- githubStargazers: 17510
- packagistDownloads: not applicable
- npmWeeklyDownloads: 67851762
- contributors: 415
- pluginCount: unknown
- packagistMonthlyDownloads: unknown
- ecosystemsMonthlyDownloads: unknown
- httpArchiveSites: unknown
- wordpressActiveInstalls: unknown
- dependentRepos: 19
- dependentPackages: 162

### Sources

- urls: https://effect.website/ (read 2026-11-08)
- urls: https://effect.website/docs/v4/onboarding (read 2026-11-08)
- urls: https://api.github.com/repos/Effect-TS/effect (read 2026-11-08)
- maintainer: https://raw.githubusercontent.com/Effect-TS/effect/main/LICENSE (read 2026-11-08)
- language: https://api.github.com/repos/Effect-TS/effect (read 2026-11-08)
- runtime: https://effect.website/docs/v4/getting-started/installation (read 2026-11-08)
- license: https://raw.githubusercontent.com/Effect-TS/effect/main/LICENSE (read 2026-11-08)
- currentMajor: https://github.com/Effect-TS/effect/releases/tag/effect@4.1.2 (read 2026-11-08)
- latestReleaseDate: https://github.com/Effect-TS/effect/releases/tag/effect@4.1.2 (read 2026-11-08)
- githubStargazers: https://api.github.com/repos/Effect-TS/effect (read 2026-11-08)
- contributors: https://api.github.com/repos/Effect-TS/effect/contributors (read 2026-11-08)
- npmWeeklyDownloads: https://api.npmjs.org/downloads/range/2026-11-01:2026-11-07/effect (read 2026-11-08)
- dependentPackages: https://packages.ecosyste.ms/api/v1/registries/npmjs.org/packages/effect (read 2026-11-08)
- dependentRepos: https://packages.ecosyste.ms/api/v1/registries/npmjs.org/packages/effect (read 2026-11-08)

## Notes

Effect is a TypeScript library with typed errors, dependency injection, concurrency, scheduling and schema validation. It is published on npm as `effect` and runs on Node.js, Deno and Bun, according to its installation guide. The repository is a monorepo that also holds integration packages, among them platform services for the browser, SQL clients and provider packages for AI services. The MIT license names Effectful Technologies Inc as the copyright holder, and the documentation is on [effect.website](https://effect.website/docs/v4/onboarding).

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Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Attributes are recorded, never scored; absent means unknown.
Credit, in full: FindSoftware, CC BY 4.0