purescript VS fp-ts

Compare purescript vs fp-ts and see what are their differences.

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purescript fp-ts
52 96
8,443 10,421
0.3% -
6.6 7.5
24 days ago 18 days ago
Haskell TypeScript
BSD 3-clause "New" or "Revised" License MIT License
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.


Posts with mentions or reviews of purescript. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2024-02-29.


Posts with mentions or reviews of fp-ts. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2024-03-24.
  • Type-Safe Printf() in TypeScript
    4 projects | news.ycombinator.com | 24 Mar 2024
    While I certainly agree, I've found that this is often an indication of too-complex an architecture, and a fundamental re-think being necessary. I've had projects that depend on [fp-ts], which end up incredibly generic-heavy, but still make it entirely through a typecheck(not build- typescript's just worse at that than other tools like esbuild) in seconds-at-worse.

    Obviously depends on your organization/project/application, but I do like these things as complexity-smells.

    [fp-ts]: https://gcanti.github.io/fp-ts/

  • Introducing fp-utils a functional utility library for Deno / Node
    2 projects | /r/Deno | 10 Dec 2023
    Unlike more comprehensive functional libraries like fp-ts, each module can be imported and resolved separately. If you just need options, simply add the option module and you're good to go.
  • Blog post: graphs and monads with Typescript
    2 projects | /r/typescript | 7 Dec 2023
    While it's quite abstract, I believe it may be useful to those of you who is interested to learn more about functional programming [in Typescript] and also get more intuition on diverse programming ideas. I use fp-ts as a functional programming library there.
  • Functional Programming Library for Golang by IBM
    8 projects | news.ycombinator.com | 17 Aug 2023
    The library for TypeScript that this is influenced by is here:


    Interesting how both languages with this library converge to a similar syntax, due to heavy use of functions.

  • Is Scala worth learning in 2023?
    5 projects | /r/scala | 29 Jun 2023
    Learn something that pays the bill first - nowadays it's Golang/Rust react/typescript. Then you can try some pure fp libs like fp-ts and fp-core.rs, and look through existing scala cats docs. If you'll feel bad about it - that's totally fine and expectable, fp takes a paradigm shift and not that many dev able to shift their brains way of thought due to basic psychological rigidity) (inability to change habits and to modify concepts/attitudes once developed). And that's purely a staffing and management issue - folks hired randoms out of the blue, and called 'em a team.
  • Application Bootstrapping with fp-ts
    2 projects | dev.to | 24 Jun 2023
    fp-ts, a library that caters to functional programming in TypeScript, comes with some micro-abstractions that already solve a few of our needs.
  • Error Handling Patterns
    3 projects | news.ycombinator.com | 4 May 2023
    looks like more ergonomic/focused version of fp-ts[1]

    [1] https://gcanti.github.io/fp-ts/

  • To`class` or not to `class`?
    4 projects | /r/typescript | 26 Apr 2023
    The approach of checked errors is making a comeback. See Swift, Rust, Kotlin + Arrow.kt, and several takes on it in TypeScript: purify, fp-ts, etc.
  • For Production Users: Haskell in an age of Rust and Python
    3 projects | /r/haskell | 21 Apr 2023
    Yeah, TypeScript is shockingly good for a language that is so compatible with JavaScript. For example fp-ts. The main problem with TypeScript is pervasive mutability and side-effects.
  • Why I use Typescript nominal types [3via series part 3]
    3 projects | dev.to | 18 Apr 2023
    Back at my last job I was lucky enough to stumble upon some pretty awesome colleagues thanks to which I found even greater depths in Typescript which cemented the love even more. We used FP-TS to rewrite a legacy Feathers.js application and I learned many principles I later applied to my own full-stack "framework".

What are some alternatives?

When comparing purescript and fp-ts you can also consider the following projects:

effect - A fully-fledged functional effect system for TypeScript with a rich standard library

ramda - :ram: Practical functional Javascript

proposal-pattern-matching - Pattern matching syntax for ECMAScript

reason - Simple, fast & type safe code that leverages the JavaScript & OCaml ecosystems

io-ts - Runtime type system for IO decoding/encoding

TypeScript - TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

immutable-js - Immutable persistent data collections for Javascript which increase efficiency and simplicity.


Elm - Compiler for Elm, a functional language for reliable webapps.

rescript-compiler - The compiler for ReScript.

Idris2 - A purely functional programming language with first class types

eslint-plugin-functional - ESLint rules to disable mutation and promote fp in JavaScript and TypeScript.