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    3.4.1 • Public • Published

    TypeScript Standard Endpoints

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    Declarative, strongly typed, reusable network definitions for networking libraries.

    1) Define the function

    import { Endpoint } from '@rest-hooks/endpoint';
    const fetchUser = ({ id })  fetch(`/users/${id}`).then(res => res.json());
    const UserDetail = new Endpoint(fetchUser);

    2) Reuse with different hooks

    function UserProfile() {
      const user = useSuspense(UserDetail, { id });
      const ctrl = useController();
      const updateUser = (data) => ctrl.fetch(UserDetail, { id }, data);
      return <UserForm user={user} onSubmit={updateUser} />

    3) Or call directly

    const user = await UserDetail({ id: '5' });


    There is a distinction between

    • What are networking API is
      • How to make a request, expected response fields, etc.
    • How it is used
      • Binding data, polling, triggering imperative fetch, etc.

    Thus, there are many benefits to creating a distinct seperation of concerns between these two concepts.

    With TypeScript Standard Endpoints, we define a standard for declaring in TypeScript the definition of a networking API.

    • Allows API authors to publish npm packages containing their API interfaces
    • Definitions can be consumed by any supporting library, allowing easy consumption across libraries like Vue, React, Angular
    • Writing codegen pipelines becomes much easier as the output is minimal
    • Product developers can use the definitions in a multitude of contexts where behaviors vary
    • Product developers can easily share code across platforms with distinct behaviors needs like React Native and React Web

    What's in an Endpoint

    • A function that resolves the results
    • A function to uniquely store those results
    • Optional: information about how to store the data in a normalized cache
    • Optional: whether the request could have side effects - to prevent repeat calls


    @rest-hooks/endpoint defines a standard interface

    interface EndpointInterface {
        (params?: any, body?: any): Promise<any>;
        key(parmas?: any): string;
        schema?: Readonly<S>;
        sideEffects?: true;
        // other optionals like 'optimistic'

    as well as a helper class to make construction easier.

    class Endpoint<F extends () => Promise<any>> {
      constructor(fetchFunction: F, options: EndpointOptions);
      key(...args: Parameters<F>): string;
      readonly sideEffect?: true;
      readonly schema?: Schema;
      fetch: F;
      extend(options: EndpointOptions): Endpoint;
    export interface EndpointOptions extends EndpointExtraOptions {
      key?: (params: any) => string;
      sideEffect?: true | undefined;
      schema?: Schema;


    key: (params) => string

    Serializes the parameters. This is used to build a lookup key in global stores.


    `${this.fetch.name} ${JSON.stringify(params)}`

    sideEffect: true | undefined

    Disallows usage in hooks like useSuspense() since they might call fetch an unpredictable number of times. Use this for APIs with mutation side-effects like update, create, deletes.

    Defaults to undefined meaning no side effects.

    schema: Schema

    Declarative definition of where Entities appear in the fetch response.

    Not providing this option means no entities will be extracted.

    import { Entity } from '@rest-hooks/normalizr';
    import { Endpoint } from '@rest-hooks/endpoint';
    class User extends Entity {
      readonly id: string = '';
      readonly username: string = '';
      pk() { return this.id;}
    const UserDetail = new Endpoint(
        ({ id })  fetch(`/users/${id}`),
        { schema: User }


    extend(EndpointOptions): Endpoint

    Can be used to further customize the endpoint definition

    const UserDetail = new Endpoint(({ id })  fetch(`/users/${id}`));
    const UserDetailNormalized = UserDetail.extend({ schema: User });


    export interface IndexInterface<S extends typeof Entity> {
      key(parmas?: Readonly<IndexParams<S>>): string;
      readonly schema: S;
    import { Entity } from '@rest-hooks/normalizr';
    import { Index } from '@rest-hooks/endpoint';
    class User extends Entity {
      readonly id: string = '';
      readonly username: string = '';
      pk() { return this.id;}
      static indexes = ['username'] as const;
    const UserIndex = new Index(User)
    const bob = useCache(UserIndex, { username: 'bob' });
    // @ts-expect-error Indexes don't fetch, they just retrieve already existing data
    const bob = useSuspense(UserIndex, { username: 'bob' });


    npm i @rest-hooks/endpoint

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