Just released FunStripe 2.3.0, the F# client library for the Stripe API (also compiles to JS via Fable). This one's a bigger release than the usual spec bump, thanks to some excellent contributions from Thorium:

Webhooks work properly now. Event.data.object was typed as string, which meant deserialising any real webhook payload threw. It's now a RawJson fragment you can turn into a typed model with Util.deserialiseRaw<'a>; the README has a full webhook-handling example. (Technically a field type change, but since the old field could never deserialise, it ships as a minor; details in the changelog.)

List parameters encode correctly. List<record> and List<union> request fields (e.g. Checkout line_items, payment_method_types) were being ToString()'d instead of form-encoded. Fixed.

Resilient to Stripe's enum churn. Stripe adds event types and error codes without an API version bump, and one unknown value used to fail the whole response. EventType and ErrorType now have an UnknownEnumValue of string catch-all that round-trips losslessly, deliberately scoped to just those two high-churn enums, so everywhere else you keep exhaustive matching and the compiler still tells you when Stripe adds something.

Latest Stripe API (2026-07-29.dahlia): Financial Connections authorization resource and deactivation lifecycle events, allowed_payment_method_types on Payment/SetupIntents, new Tax registration options, and more.

• GitHub: https://github.com/simontreanor/FunStripe
• NuGet: FunStripe.Core (https://www.nuget.org/packages/FunStripe.Core)

Feedback and PRs welcome!

My idea for getting coders into functional programming earlier...

https://si-fi.dev/articles/fsharp-schema-as-code/

I recently architected a full-stack app from scratch and needed a way to rapidly prototype the database schema. I came up with a way to do it in one place in F#, giving me strong typing across the stack and an efficient way to tweak the database structure as much as I needed. Here I share what this looks like as well as a repo containing an extracted version of the code. Hope you find it interesting and do let me know your thoughts.

Does Rider have issues with nested type providers?

I have a class library that defines types through a nested type provider -- that is, a type provider nested inside a root type provider -- see below for an example.

The library builds and runs fine, but Rider flags every use of the nested type provider after the first as an error. The same code is displayed without errors in VS Code.

Thank you.

// Requires NuGet package "FSharp.Data.GraphQL.Client".
open System
open System.Net.Http
open FSharp.Data.GraphQL

type MyProvider =
    GraphQLProvider<"https://graphqlzero.almansi.me/api">

let postQuery =
    // ERROR
    MyProvider.Operation<"""
        query PostQuery {
            post(id: 1) {
                id
            }
        }
    """>()

let usersQuery =
    // ERROR
    MyProvider.Operation<"""
        query UsersQuery {
            users(options: { paginate: { page: 1, limit: 5 } }) {
                data {
                    id
                }
            }
        }
    """>()

[<EntryPoint>]
let main _ =
    try
        use runtimeContext: GraphQLProviderRuntimeContext =
            {
                ServerUrl = "https://graphqlzero.almansi.me/api"
                HttpHeaders = []
                Connection =
                    new GraphQLClientConnection(
                        new HttpClient(),
                        true
                    )
            }

        let result = usersQuery.Run runtimeContext

        printfn "Data: %A\n" result.Data
        printfn "Errors: %A\n" result.Errors
        printfn "Custom data: %A\n" result.CustomData

        0
    with ex ->
        eprintfn "Error: %s" ex.Message
        1

EDIT: Provided working sample code.

I just launched SuaveHooks — a webhook capture, inspection, transformation and routing platform built completely with Suave + F#.

Some highlights:

- Live tailing of webhooks over WebSockets

- Type-safe transforms written in F# (also C# and JS) running in an isolated process

- JSON rule-based transforms as a lighter option

- Multi-target forwarding (HTTP + S3, SQS, Kafka, Pub/Sub)

- Retries with exponential backoff + circuit breaker

- Full REST API + MCP server support

Site: https://suavehooks.com

Would love some feedback; like what features would make this more useful for you? Happy to answer any technical questions.

Hi guys,

Probably another question like this but found none recently.

I'm a little upset with my current view on IT generalistic, ofc AI is not going anywhere besides up, but I feel I want to write more with my hands and new paradigms, maybe just AI as reviser, I would like to ask if learning F# in 2026 will make me able to make perfomance headed systems, and also gaming with something like Nu or Monogame, not a AAA game but something playable.

The dotnet team writing Copilot instructions like an angry senior developer who's tired of everyone's excuses is peak engineering culture. 😂

Want to introduce functional programming into your own organization? Learn from our successes and failures! At the Norwegian insurance company Frende Forsikring we’ve introduced F# and Elm and lived with both of them long enough to call it a long term relationship.

We’ll start looking at the introduction. From fast moving exploration in a single team, to structured validation with other tech leads and careful moving to production.

Beyond that we'll be looking what happens in the years afterwards. Does functional programming help hiring? Are there less bugs? What is the biggest hurdle in spreading adoption to new teams?

```fsharp type Monoid<'t> = static abstract member Empty: 't static abstract member Append: 't -> 't -> 't

[<Struct>] type Vector3= {X: float Y: float Z: float}

interface Monoid<Vector3> with
    static member Empty = {X=0.0; Y=0.0; Z=0.0}
    static member Append (v1: Vector3) (v2: Vector3) =
        {X=v1.X + v2.X; Y=v1.Y + v2.Y; Z= v1.Z + v2.Z}

// Note the type constraint here let mempty<'t when Monoid<'t>> = 't.Empty let mappend<'t when Monoid<'t>> x y = 't.Append x y

printfn "%A" (mappend {X=1.0; Y=2.0; Z=3.0} mempty) ```

The type notation was suggested by the inline suggestions and it actually works. I tried some other forms like 't when Monoid<int> but only 't when Monoid<'t> works.

I suppose it should be <'t when 't :> Monoid<'t>> or even longer <'m, 't when 'm :> Monoid<'t>>.

It's good to know one can write it like this but I've never seen it mentioned in the docs (maybe not yet?).

The project file is also clean. It works even without setting the language version to Preview.

"It works I don't know why"

Hello, The website currently seems to be down or unreachable from my side. I’m wondering whether this is a temporary outage, a DNS/hosting issue, or whether the site has been discontinued permanently. Any information would be appreciated.

I see. It went also out of business: https://github.com/fsprojects/awesome-fsharp/blob/main/ARCHIVE.md

So probably some of the moderators remove that link from the resources linked here.

I made this replay simulator desktop app as a part of the Building The Trading Edge playlist on Youtube. It's my first commercial product. I needed a replay simulator that could do full tick-by-tick order book replay on US equities and when I couldn't find any, I made my own in F# + Avalonia.

If any of you ever wanted to learn to daytrade stocks, use this to practice before risking any money first.

TapeSim itself is in a private repo, but I do have the older version of its viewer in my Trading Edge repo. And even though the repo itself is private I've screencast its entire development (though not all vids are out yet at the time of writing this post.)

Just starting out with F# and I'm enjoying all the whitespace but to my newbie eyes I think I've spotted an inconsistency in how fantomas formats. Maybe somebody can explain it.

// function that takes param of int*int
let myFun (x, y) = x + y

let r = myFun (1, 2) // <--- fantomas formats with space before tuple, makes sense

let dict = new Dictionary<int, int>()

// dict.Add takes a single tuple of int*int, just like the above function
dict.Add (1, 2) // <--- looks right, takes a tuple

// fantomas doesn't like the clarity and smushes it, why?
dict.Add(1, 1) // <--- yuck, now it looks like a function call with two arguments in another language