• RPC-like client with no codegen
  Fully typed RPC-like client, with no need for code generation!

• API design agnostic
  REST? HTTP-RPC? Your own custom hybrid? rescript-rest doesn't care!

• First class DX
  Less unnecessary builds in monorepos, instant compile-time errors, and instantly view endpoint implementations through your IDEs "go to definition"

• Small package size and tree-shakable routes
  Routes comple to simple functions which allows tree-shaking only possible with ReScript.

⚠️ rescript-rest is currently in Beta and has very limited list of features. Be aware of possible breaking changes ☺️

⚠️ rescript-rest relies on rescript-schema which uses eval for parsing. It's usually fine but might not work in some environments like Cloudflare Workers or third-party scripts used on pages with the script-src header.

Install peer dependencies rescript (instruction) and rescript-schema (instruction).

Then run:

npm install rescript-rest

Add rescript-rest to bs-dependencies in your rescript.json:

{
  ...
+ "bs-dependencies": ["rescript-rest"],
}

Create Contract.res and define your routes:

// Contract.res

let createGame = Rest.route(() => {
  path: "/game",
  method: "POST",
  schema: s => {
    "userName": s.field("user_name", S.string),
  },
})

🧠 Currently rescript-rest supports only client, but the idea is to reuse the file both for client and server.

Now you can use the contract to perform type-safe calls to your server:

// Client.res

let client = Rest.client(~baseUrl="http://localhost:3000")

let _ = await client.call(Contract.createGame, ~variables={"userName": "Dmitry"})

• Support path params
• Implement type-safe response
• Support passing headers and fetch options
• Generate OpenAPI from Contract
• Generate Contract from OpenAPI
• Integrate with Fastify on server-side