First of all, I want to tell you I created the tool `graphql-zeus` it is GraphQL client on top of the fetch function. What it means? Basically, you point Zeus to the GraphQL schema and it generates libraries for you.

Sounds fun? It is even more fun because you don't have to know `gql` the query language of GraphQL because Zeus provides you with its own GraphQL query like autocompleted syntax.

Create a project folder:

```bash
mkdir zeus-tutorial
cd zeus-tutorial
```

Let's start then. First, you will have to init a new npm package:

```bash
npm init
```

click enter enter enter etc.

Install dev dependencies.

```bash
npm i -D @babel/core @babel/node @babel/preset-env
```

Install dependencies.

```bash
npm i node-fetch
```

Then Create .babelrc file

```bash
echo '{ "presets": ["@babel/preset-env"] }' >> .babelrc
```

Then Create the src directory

```bash
mkdir src
```

and create a `index.js` file

```bash
touch src/index.js
```

Add script to your package.json

```gql
{
  "scripts": {
    "start": "babel-node src/index.js"
  }
}
```

Your whole package.json should look like this:

```gql
{
  "name": "zeustutorial",
  "version": "1.0.0",
  "description": "",
  "main": "main/index.js",
  "scripts": {
    "start": "babel-node src/index.js"
  },
  "author": "Aexol <aexol@aexol.com> (http://aexol.com)",
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.5.5",
    "@babel/node": "^7.5.5",
    "@babel/preset-env": "^7.5.5"
  },
  "dependencies": {
    "node-fetch": "^2.6.0"
  }
}
```

Now it is high time to generate some code from GraphQL. Go ahead install `graphql-zeus`.

install `graphql-zeus`

```bash
npm i -g graphql-zeus
```

Generate files from pokemon schema

```bash
zeus https://graphql-pokemon.now.sh/ ./src
```

Hurray! You should have definition files generated in ./src folder.
Now go and open some editor of choice - I prefer VSCode but it is up to you. I can guarantee it works with VSCode though.

Open package directory with editor. Open `src/index.js`
In the first part of the series, we will write simple query loading first ten pokemon names and images and display it in the terminal.

```ts
import { Chain } from './graphql-zeus';

const chain = Chain('https://graphql-pokemon.now.sh');

const run = async () => {
  const { pokemons } = await chain.Query({
    pokemons: [
      {
        first: 10,
      },
      {
        name: true,
        image: 'true',
      },
    ],
  });
  console.log(pokemons);
  return pokemons;
};
run();
```

In zeus everything is typed so when you write `chain.` You should see Query and when you open `{}` parentheses you should see all the possible queries.

In zeus everything is autocompleted so you don't have to learn `gql` syntax.

And run it with being in the project folder

```bash
npm run start
```

You should see the first ten pokemon in the output! Congratulations you've just done your first GraphQL query.

![result](https://graphqleditorcms.fra1.cdn.digitaloceanspaces.com/graphqleditorcms/blogpost/result.webp)

## Support

If you want to support me creating `graphql-zeus` visit

[Github Zeus Repo](https://github.com/graphql-editor/graphql-zeus)

and leave a star. That's it.

Communication with GraphQL Server in JS with Pokemon Schema

Ready for take-off?

For GraphQL cache can significantly improve performance and reduce redundancy, particularly when the same data is queried multiple times within a short timeframe. In this post, I'll go over implementing caching using [GraphQL Zeus](/docs/zeus) to fetch data from our custom CMS. No worries this can also be applied just as effectively to other GraphQL APIs, such as Hygraph or Hasura. Whether you’re working with a headless CMS, an e-commerce backend, or any other GraphQL-powered service, caching is just as important in every scenario and the implementation should look very similar.

## Why Add Caching?

Caching provides a number of advantages like:
 -  Reduced Server Load: By serving repeated requests from the cache, you avoid making unnecessary calls to the GraphQL server, which can be essential for scaling applications with high traffic.
 - Improved Performance: frequently requested data can be served directly from memory, reducing query response time significantly
 - Cost Efficiency: if your GraphQL API usage is metered (e.g., cloud-based APIs), caching significantly reduces the number of queries made, saving on usage costs

## [GraphQL Zeus](/docs/zeus) query example

Let’s start with a simple query I made using [GraphQL Zeus](/docs/zeus), which fetches homepage data from our CMS:

```ts
export const getHomepageData = async () => {
  try {
    const result = await chain('query')({
      onehomepageBySlug: [{ slug: 'home' }, HomepageDataSelector],
    });
    return result;
  } catch (error) {
    console.error('failed to fetch home data', error);
  }
};
```

This query retrieves all the homepage data at once and passes it to the relevant components. This allows users to update the homepage content directly through the CMS without needing to modify any code. Currently, this function is called in server-side props, meaning it triggers an API call every time the page is refreshed or visited.

To optimize this and reduce redundant API calls, we’ll implement caching by using the [node-lru-cache](https://github.com/isaacs/node-lru-cache) library.

## LRU cache

LRU stands for "Least Recently Used," a caching strategy that automatically removes the least recently accessed items when the cache reaches its limit. The node-lru-cache library offers several configuration options, but in our case to set up a basic GraphQL cache, we only need two key settings:

 - `ttl` (Time to Live): This setting defines how long an item stays in the cache before it’s considered expired, specified in milliseconds.
 - `ttlAutopurge`: When enabled, this option automatically deletes expired items from the cache. Without it, expired items are only purged when the cache is next accessed which can potentially lead it to grow unbounded.
 
```ts
import { LRUCache } from 'lru-cache';

const cache = new LRUCache({
  ttl: 1000 * 60 * 5, // Set time to live to 5 minutes
  ttlAutopurge: true,  // Automatically clean up expired entries
});
```

## Caching the query

To cache the query I mentioned earlier, we need to do three simple things:
1. Set up a cache key: This helps the cache know which entry to return when the same data is requested. You can name the key however you like, but it has to be unique to avoid conflicts.
2. Check if the cache contains the result: If the cache has the entry for that key, return the cached result.
3. Store the query result in the cache: After fetching the data, save the result in the cache for future use.

```ts
export const getHomepageData = async () => {
  const cacheKey = 'homepageData'; // Cache key for this entry
  if (cache.has(cacheKey)) { // Check if the cache contains this key
    return cache.get(cacheKey) as { onehomepageBySlug: HomepageDataType }; // Return cached result
  } 
  try {
    const result = await chain('query')({
      onehomepageBySlug: [{ slug: 'home' }, HomepageDataSelector],
    });
    cache.set(cacheKey, result); // Store query result in the cache
    return result;
  } catch (error) {
    console.error('failed to fetch home data', error);
  }
};
```

This approach results in two scenarios:

 - First visit: The query runs, fetches the data, and caches it for future use.
 - Subsequent visits (within the TTL): The cached result is returned, avoiding the need to make a new API request.

## Query with params (slug, locale)

As mentioned earlier, the cache key must be unique to avoid conflicts. This is especially important for queries that include parameters, such as `locale` (for localization) or `slug` (for specific blog pages). Without unique cache keys, you may end up with the same content being served for different locales or blog pages. To avoid this, it's best to use a dynamic cache key based on the query parameters.

```ts
export const getBlogpostBySlug = async ({ slug }: { slug: string }) => {
  const cacheKey = `Blogpost:${slug}`; // Unique cache key based on the slug
```

By using this dynamic approach, we ensure that the correct data is returned for the given slug. If you were to use a static cache key like 'blogpost', you'd always get the first cached blog post, regardless of which slug is provided. The same issue would arise with localization: without unique keys, you'd end up serving the wrong content for different locales.

## Its all about performance

GraphQL is all about efficiency — retrieving only the data you need (unlike REST). It makes sense to take that a step further to further enhance performance. With a GraphQL cache setup like this we can reduce redundant API calls and significantly speed up queries, especially for frequently accessed data like homepage content or blog posts. Dynamic cache keys based on query parameters ensure that the data is correctly localized or filtered according to specific slugs and [GraphQL Zeus](/docs/zeus) and selectors keep everything type-safe. Together this solution can greatly improve your app's speed and scalability. As mentioned, even if you're not using [GraphQL Zeus](/docs/zeus), the implementation should still be very similar to the above, so give it a try!
  

GraphQL cache: using LRU cache with GraphQL Zeus

Unlocking the Power of React 19

Welcome to a short post about a recent quality of life update to [GraphQL Zeus](/docs/zeus). If you're not familiar with [GraphQL Zeus](/docs/zeus) go ahead and read my [earlier post which breaks down its basics](/what-is-graphql-zeus). If you are lets go ahead and talk about the update!

### Graphql Fragments

GraphQL has long supported reusable fields natively with the use of fragments. If you're not familiar with them basically if you had the same fields in multiple queries you could define a fragment - a set of fields, and then reuse it instead of repeating all the fields every time. Lets say you had a user with some fields like name, email, address. Then you could use a fragment like this:

```ts
query getUser {
  user(id: 4) {
    ...userFields
  }
}

fragment userFields on User {
  name,
  email,
  address,
  avatar
}
```

For reusability you could put all your fragments in a fragments.js file and then use them across a project. Zeus already had a solution like Selectors (which work a bit similarly to that) but with the latest update it can now go a step further! :)

### Zeus fields - GraphQL spread operator

For our example lets say we need to get the posts data for our blog page where we display them in a grid, usually the query that would look something like this:

```ts
const posts = await Chain('http://example.com/api/graphql')('query')({
  posts: [
    {
      title: true,
      coverImage: true,
      publishedAt: true,
      slug: true,
      content: { markdown: true },
    },
  ],
});
```

With Zeus 6.0.0 you can simply use a spread operator `...fields` with the TypeScript type from the schema (eg. `Post`) to simply get all the fields available for that type:

```ts
const posts = await Chain('http://example.com/api/graphql')('query')({
  posts: [
    {
      ...fields('Post'),
    },
  ],
});
```

### Never go full REST

With this, we now have a convenient quality-of-life improvement for cases where you just want to quickly retrieve all the fields for a type. That said it's important to remember what GraphQL is all about - getting exactly what you requested without overfetching. So don't just use `...fields` everywhere or you'll defeat the entire purpose of using GraphQL in the first place and turn it into REST, always pulling way more data than necessary.


Communication with GraphQL Server in JS with Pokemon Schema

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