{"data":{"slug":"effect","name":"Effect","tagline":"MIT production TypeScript toolkit — typed errors & concurrency","category":"libraries","categoryName":"Libraries","url":"https://effect.website","github":"https://github.com/Effect-TS/effect","pricing":"open-source","hook":"Effect is the TypeScript toolkit for production systems — typed errors, fibers, streams, and schema — not another Zod twin.","whatsGood":"MIT (Effect-TS/effect). Full runtime+stdlib shape: Effect type for typed failure, concurrency/fibers, streaming, scheduling, and Schema. Docs and ecosystem at effect.website. Serious adoption (~16k★) for TS backends that outgrew Promise soup.","theCatch":"Vs Zod/Valibot (schema validation): Effect Schema is one piece; Effect is a whole effect system and runtime, not a drop-in validator. Learning curve and import surface are real — teams that only need parse/validate should stay on Zod/Valibot.","verdict":"MIT TS effect system. Production toolkit vs Zod/Valibot validation-only; steep but coherent.","addedAt":"2026-09-16","featured":false,"domain":"Libraries","subSpecialty":"Libraries","subcategory":"Types & Validation","tags":["self-host","permissive","active"],"capabilities":[],"surfaces":["Self-host"],"ecosystem":["Node.js"],"licenseModel":"OSS/MIT","githubStars":17324,"starsPerWeek":48,"access":"free","archived":false,"repo":{"createdAt":"2019-11-13","pushedAt":"2026-10-19","license":"MIT","archived":false,"checkedAt":"2026-10-19"}},"related":[{"slug":"hono","name":"Hono","tagline":"Tiny TypeScript web framework that runs on every runtime"},{"slug":"phaser","name":"Phaser","tagline":"MIT HTML5 2D game framework with scenes, physics, and tilemaps"},{"slug":"pixijs","name":"PixiJS","tagline":"MIT 2D WebGPU/WebGL renderer, not a game engine"},{"slug":"babylonjs","name":"Babylon.js","tagline":"Apache-2.0 3D engine for the web, now on v9"},{"slug":"playcanvas","name":"PlayCanvas","tagline":"MIT WebGL2/WebGPU engine plus an optional hosted Editor"}],"links":{"self":"/api/gems/effect","html":"/gems/effect","markdown":"/gems/effect.md","category":"/api/gems?category=libraries","categoryPage":"/stacks/libraries"}}