FetchClient

FetchClient is a library that makes it easier to use the fetch API for JSON APIs. It provides the following features:

• Makes fetch easier to use for JSON APIs
• Automatic model validation
• Caching
• Middleware
• Problem Details support
• Option to parse dates in responses

Install

npm install --save @exceptionless/fetchclient

Docs

API Documentation

Usage

Typed Response

import { FetchClient } from '@exceptionless/fetchclient';

type Products = {
  products: Array<{ id: number; name: string }>;
};

const client = new FetchClient();
const response = await client.getJSON<Products>(
  `https://dummyjson.com/products/search?q=iphone&limit=10`,
);

const products = response.data;

Typed Response Using a Function

import { getJSON } from '@exceptionless/fetchclient';

type Products = {
  products: Array<{ id: number; name: string }>;
};

const response = await getJSON<Products>(
  `https://dummyjson.com/products/search?q=iphone&limit=10`,
);

const products = response.data;

Model Validator

import { FetchClient, setModelValidator } from '@exceptionless/fetchclient';

setModelValidator(async (data: object | null) => {
  // use zod or any other validator
  const problem = new ProblemDetails();
  const d = data as { password: string };
  if (d?.password?.length < 6) {
    problem.errors.password = [
      "Password must be longer than or equal to 6 characters.",
    ];
  }
  return problem;
});

const client = new FetchClient();
const data = {
  email: "test@test",
  password: "test",
};

const response = await client.postJSON(
  "https://jsonplaceholder.typicode.com/todos/1",
  data,
);

if (!response.ok) {
  // check response problem
  console.log(response.problem.detail);
}

Caching

import { FetchClient } from '@exceptionless/fetchclient';

type Todo = { userId: number; id: number; title: string; completed: boolean };

const client = new FetchClient();
const response = await client.getJSON<Todo>(
  `https://jsonplaceholder.typicode.com/todos/1`,
  {
    cacheKey: ["todos", "1"],
    cacheDuration: 1000 * 60, // expires in 1 minute
  }
);

// invalidate programmatically
client.cache.delete(["todos", "1"]);

Middleware

import { FetchClient, useMiddleware } from '@exceptionless/fetchclient';

type Products = {
  products: Array<{ id: number; name: string }>;
};

useMiddleware(async (ctx, next) => {
  console.log('starting request')
  await next();
  console.log('completed request')
});

const client = new FetchClient();
const response = await client.getJSON<Products>(
  `https://dummyjson.com/products/search?q=iphone&limit=10`,
);

Also, take a look at the tests:

FetchClient Tests

Contributing

Run tests:

deno run test

Lint code:

deno lint

Format code:

deno fmt

Type check code:

deno run check

License

MIT © Exceptionless