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@graphql-tools/url-loader

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@graphql-tools/url-loader

A set of utils for faster development of GraphQL tools

  • 5.0.1-alpha-3c08113.0
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
3.7M
increased by4.77%
Maintainers
3
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What is @graphql-tools/url-loader?

The @graphql-tools/url-loader package is designed for loading GraphQL schemas and operations over HTTP. It supports loading schemas through introspection, using GET or POST requests, and handling GraphQL operations such as queries, mutations, and subscriptions over HTTP or WebSockets. This package is part of the GraphQL Tools ecosystem, which provides a set of utilities for working with GraphQL in various environments.

What are @graphql-tools/url-loader's main functionalities?

Loading a GraphQL schema from a URL

This feature allows you to load a GraphQL schema from a remote endpoint. The `loadSchema` function uses the `UrlLoader` to fetch the schema using introspection from the provided URL.

const { loadSchema } = require('@graphql-tools/url-loader');

async function getSchema() {
  const schema = await loadSchema('http://your-graphql-endpoint.com/graphql', {
    loaders: [
      new UrlLoader()
    ]
  });
  return schema;
}

Executing a GraphQL operation using fetch

This demonstrates how to execute a GraphQL operation (query, mutation, or subscription) against a remote endpoint. The `UrlLoader` provides an `executor` function that can be used to send operations to the GraphQL server.

const { loadSchema, UrlLoader } = require('@graphql-tools/url-loader');

async function executeOperation(operation) {
  const loader = new UrlLoader();
  const executor = loader.getExecutor('http://your-graphql-endpoint.com/graphql');
  const result = await executor({
    document: operation
  });
  return result;
}

Subscribing to GraphQL subscriptions over WebSocket

This feature enables subscribing to GraphQL subscriptions using WebSockets. It leverages the `subscriptions-transport-ws` library to create a WebSocket client and then uses `createClient` from `@graphql-tools/url-loader` to handle subscriptions.

const { SubscriptionClient } = require('subscriptions-transport-ws');
const { createClient } = require('@graphql-tools/url-loader');

const wsClient = new SubscriptionClient('ws://your-graphql-endpoint.com/graphql', {
  reconnect: true
});

const client = createClient({
  url: 'http://your-graphql-endpoint.com/graphql',
  webSocketImpl: wsClient
});

const subscription = client.request({
  query: 'subscription { newData }'
}).subscribe({
  next(data) {
    console.log(data);
  }
});

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Package last updated on 13 May 2020

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