next.js/examples/cms-storyblok/lib/api.js

async function fetchAPI(query, { variables, preview } = {}) {
  const res = await fetch("https://gapi.storyblok.com/v1/api", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      Token: process.env.STORYBLOK_API_KEY,
      Version: preview ? "draft" : "published",
    },
    body: JSON.stringify({
      query,
      variables,
    }),
  });

  const json = await res.json();
  if (json.errors) {
    console.error(json.errors);
    throw new Error("Failed to fetch API");
  }

  return json.data;
}

export async function getPreviewPostBySlug(slug) {
  const post = await fetchAPI(
    `
  query PostBySlug($slug: ID!) {
    PostItem(id: $slug) {
      slug
    }
  }
  `,
    {
      preview: true,
      variables: {
        slug: `posts/${slug}`,
      },
    },
  );
  return post;
}

export async function getAllPostsWithSlug() {
  const data = await fetchAPI(`
    {
      PostItems {
        items {
          slug
        }
      }
    }
  `);
  return data?.PostItems.items;
}

export async function getAllPostsForHome(preview) {
  const data = await fetchAPI(
    `
    {
      PostItems(sort_by: "first_published_at:desc") {
        items {
          slug
          published_at
          first_published_at
          content {
            long_text
            intro
            title
            image
            author {
              name
              content
            }
          }
        }
      }
    }
  `,
    { preview },
  );
  return data?.PostItems.items;
}

export async function getPostAndMorePosts(slug, preview) {
  const data = await fetchAPI(
    `
  query PostBySlug($slug: ID!) {
    PostItem(id: $slug) {
      slug
      published_at
      first_published_at
      id
      content {
        long_text
        intro
        title
        image
        author {
          name
          content
        }
      }
    }
    PostItems(per_page: 3, sort_by: "first_published_at:desc") {
      items {
        slug
        published_at
        first_published_at
        content {
          long_text
          intro
          title
          image
          author {
            name
            content
          }
        }
      }
    }
  }
  `,
    {
      preview,
      variables: {
        slug: `posts/${slug}`,
      },
    },
  );

  return {
    post: data?.PostItem,
    morePosts: (data?.PostItems?.items || [])
      .filter((item) => item.slug !== slug)
      .slice(0, 2),
  };
}