ytypescript_api

ytypescript_api library gives a 'standard' way to define, implement and call API in Typescript. See Examples.

Usage

Define API

Use apiDefinition to define an API like this. Put it into separate file into 'api' folder and share that folder between client and server.

import {apiDefinition} from "ytypescript_api";
import {Decoder, DecoderObject, number, object, string} from "@mojotech/json-type-validation";

export const exampleApi = apiDefinition(
    "/example",         // url
    "get",              // httpMethod
    {
        x: string(),    // requestData
    },
    {
        y: number(),    // responseData
    },
);

Implement API on server

Use implementApi to implement API on server.

import {implementApi} from "ytypescript_api";
import express from "express";
import bodyParser from "body-parser";
import { exampleApi } from "./api/index.js";

const app = express();
const port = 3000;

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }));

// parse application/json
app.use(bodyParser.json());

implementApi(app, exampleApi, (requestData: typeof exampleApi.request /* uncomment if needed: , req: Request, res: Response*/): typeof exampleApi.response => {
    const responseData = { y: Number(requestData.x) * 2 };
    console.log({ m: exampleApi.httpMethod, url: exampleApi.url, requestData, responseData });
    return responseData;
});

app.listen(port, () => {
    console.log(`Example app listening at http://localhost:${port}`);
});

Call API from client

Use apiFunction to make a conveniet function to call API. Or use callApi to call it.

import {callApi, apiFunction} from "ytypescript_api";
import axiosLib from "axios";
import { exampleApi } from "./api/index.js";


const axios = axiosLib.create({baseURL:"http://localhost:3000"});

(async () => {
    // Make a function to represent API in client code:
    const callExampleApi = await apiFunction(axios, exampleApi);
    const r1 = await callExampleApi({ x: '1' });
    console.log({ r1 });

    // If you need to call an api just once:
    const r2 = await callApi(axios, exampleApi, { x: '1' });
    console.log({ r2 });
})();