effect
by Effect-TS
Effect is a TypeScript library for building reliable applications. It gives developers tools for typed error handling, dependency injection, concurrency, scheduling, tracing and data validation.
- Stars
- 17.4k
- Licence
- MIT
- Runs on
- Your computer
- Setup
- Moderate
- Language
- TypeScript
- Age
- 2539 days
What you can do with it
- Handle errors in a way the compiler can check, so fewer failures slip through
- Run tasks at the same time with safe cancellation and retry schedules
- Validate data and connect to databases such as PostgreSQL, MySQL or SQLite using the add-on packages
Make money with it
A freelance developer could offer Effect-based back-end builds or migrations to teams that want more dependable TypeScript systems.
An idea, not financial advice. Check the licence before charging for anything built on it.
Ways a business could use it
- Build more dependable customer-facing back ends and APIs, which cuts time spent fixing production bugs
- Offer TypeScript development or consulting work for client systems that need reliability and clear monitoring
Can you use it commercially?
Free to use, change and sell, including in paid products. Keep the copyright notice.
Not legal advice. Read the project's licence file before building a product on it.
Getting it running
Install it into a TypeScript project with npm install effect; it needs TypeScript 5.9 or newer with strict mode on, and Node.js 18 or newer.
Follow the official instructions in the project README.
Things to check
- Steep learning curve; it uses a different programming style from ordinary TypeScript
- Version 4 has migration work for anyone on version 3
- Some APIs are marked unstable or experimental and may change
Who's talking about it
Checked 27 Oct 2026. Summary drafted by AI from the project's README.
