Clients & DevTools

- Presented by Ashwin Hegde

GraphQL

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All graphical assets are licensed under the Creative Commons Attribution 3.0 Unported License.

Agenda

  1. What & Why part of GraphQL Client?

  2. See available Clients

  3. Apollo-Client vs Relay

 Part 1 - GraphQL Clients

 Part 2 - DevTools for GraphQL

  1. In-browser IDEs

  2. Chrome debugger extensions

  3. Batching & caching

  4. Lint & security

  5. Manage, optimization, and monitoring

 What is a GraphQL Client?

{
  allBooks {
    id
    title
    author
  }
}
{
  "data": {
    "allBooks": [
      {
        "id": "1",
        "title": "Functional JavaScript",
        "author": "Michael Fogus"
      },
      {
        "id": "2",
        "title": "Maintainable JavaScript",
        "author": "Nicholas C. Zakas"
      },
      ...
      ...
    ]
  }
}

Why a GraphQL Client?

Query Response

{"data":{"hello":"Hello World!"}}
curl -X POST \
-H "Content-Type: application/json" \
-d '{"query": "{ hello }"}' \
http://localhost:3000/graphql
let xhr = new XMLHttpRequest();
xhr.responseType = 'json';
xhr.open("POST", "/graphql");
xhr.setRequestHeader("Content-Type", "application/json");
xhr.setRequestHeader("Accept", "application/json");
xhr.onload = function () {
  console.log(xhr.response);
}
xhr.send(JSON.stringify({query: "{ hello }"}));

The Simplest client is Curl or XMLHttpRequest request

Why a GraphQL Client?

Query Response

let name = "Captain Jack Sparrow!";
let xhr = new XMLHttpRequest();

xhr.responseType = 'json';
xhr.open("POST", "/graphql");
xhr.setRequestHeader("Content-Type", "application/json");
xhr.setRequestHeader("Accept", "application/json");
xhr.onload = function () {
  console.log(xhr.response);
}

const query = `query Hello($name: String!) {
  hello(name: $name)
}`;

xhr.send(JSON.stringify({
  query,
  variables: { name }
}));
{
  "data": {
    "hello": "You will always remember this as the day you almost caught
              Caption Jack Sparrow!"
    }
}

Why a GraphQL Client?

1. Switch to more complex client as your apps get more complex.

 

2. Directly send queries and mutation with constructing any kind of http requests.

 

3. Easy view layer integration and UI updates.

 

4. Caching query results.

Refs: https://bit.ly/2jNN9Bu

 

5. Build-time schema validation and optimization.

Available GraphQL Clients

3. URQL by FormidableLabs

The Advanced client is as below

1. Apollo Client & Apollo Fetch by Apollo GraphQL

2. Relay Modern & Relay Classic by Facebook GraphQL

5. GraphQL-request by Graphcool

4. Lokka by Kadira

Apollo Client vs Relay

Multiple frameworks Yes React & ReactNative
Fragments Yes Yes
Subscriptions Yes,
graphql-subscriptions & subscriptions-transport-ws		 => same
Routing React-Router React-Router-Relay (Classic),
Found Relay (Modern)
Pagination Yes Yes
Testing Jest (for React) Jest
Server Side Rendering Yes Yes (Isomorphic-relay)
Documentation Excellent Good
Learning Curve Easy Complex
Developers Tools Yes Yes

Apollo Client vs Relay

Error Handling • Control GraphQL error sent by GraphQL server using error policy.

• Can set error policy on each request.

• Can also use apollo-link-error to handle server, network and GraphQL errors.
 		 • <QueryRenderer
Render (error, props) />

• <commitMutation
onCompleted: (res, errors)
onError: (error)
/>

• Handling Partial Response: https://github.com/apollographql/apollo-client/issues/51

Notes:

Apollo Client vs Relay

DevTools

GraphiQL by Facebook GraphQL

• Default integrated with express-graphql

• Visit URL for demo https://bit.ly/2IlsaE5

GraphQL PlayGround by Graphcool

• Visit URL for demo https://graphqlbin.com/pgMjF9​

 In-browser IDEs:

Launchpad by Apollo GraphQL

• Visit URL for demo https://launchpad.graphql.com/new

DevTools

 Chrome debugger extensions

for Apollo Client

• GraphiQL: Send queries to server or Apollo cache.

• Store inspector & field name and value search.

• Demo: http://www.githunt.com/​

for Relay Modern / Classic

• Help to inspect store, its records and insight of Relay store.

• Available as Electron app for ReactNative running Relay.

• Demo: https://nodkz.github.io/relay-northwind/#/orders

DevTools

 Lint standards

eslint-plugin-graphql, ... click for more info

Supports: Apollo, Relay (classic), Lokka

graphql-schema-linter, ... click for more info

Supports: *.graphql file

 Security

Read: https://dev-blog.apollodata.com/securing-your-graphql-api-from-malicious-queries-16130a324a6b

DevTools

Apollo Engine

• GraphQL caching

• Query execution tracing

• Error tracking

• Trends

• Visit URL: https://www.apollographql.com/engine/​

 Manage, optimization and monitoring

Graphql-Lattice by Brielle Harrison (Pay Pallian)

• A tool to manage and organize your Schema and resolvers

• Visit URL: https://github.com/nyteshade/graphql-lattice

Please feel free to "Star", "Watch", "Fork" & "Contribute"

Thank you

for joining us

 

find me at

www.techjitsu.co.in

GraphQL Clients & DevTools

By Ashwin Hegde

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