Querying a single field from a Sanity schema using groq in Node.js

const filter = groq`*[_type == "siteSettings"]`;
  const projection = groq`{ image: gigs_image.asset->url}`;
  const query = [filter, projection].join(' ');
  const image = await client.fetch(query).catch(error => console.error(error));

`*[_type == "siteSettings"].gigs_image.asset->.url

require('dotenv').config({
  path: `.env.${process.env.NODE_ENV || 'development'}`
})
const sanityClient = require("@sanity/client");

const { sanity } = require('../../client-config')

/**
 * Set manually. Find configuration in
 * studio/sanity.json or on <http://manage.sanity.io|manage.sanity.io>
 */

/*
const sanity = {
  projectId: 'anokeucs',
  dataset: 'eleventy',
  useCdn: true
}
*/

module.exports = sanityClient({...sanity, useCdn: !process.env.SANITY_READ_TOKEN, token: process.env.SANITY_READ_TOKEN});

export default {
  name: 'siteSettings',
  type: 'document',
  title: 'Einstellungen',
  __experimental_actions: ['update', /* 'create', 'delete', */ 'publish'],
  fields: [
    {
      name: 'email',
      type: 'string',
      title: 'E-Mail*',
      validation: Rule => Rule.required()
    }, {
      name: 'image',
      type: 'image',
      title: 'SEO Bild*',
      description: 'Dieses Bild wird von der Suchmaschine verwendet.',
      validation: Rule => Rule.required()
    }, {
      name: 'sharing_image',
      type: 'image',
      title: 'Social Media Bild*',
      description: 'Dieses Bild wird angezeigt, wenn jemand den Link der Website auf Social Media geteilt wird.',
      validation: Rule => Rule.required()
    }, {
      name: 'gigs_image',
      type: 'image',
      title: 'Hero-Image: Gigs',
      description: 'Test test',
      validation: Rule => Rule.required()
    }
  ]
}

const filter = groq`*[_type == "siteSettings"]`;
  const projection = groq`{email, "image": image.asset->url, "sharing_image": sharing_image.asset->url, "gigs_image": gigs_image.asset->url}`;
  const query = [filter, projection].join(' ');
  const sanitySettings = await client.fetch(query).catch(error => console.error(error));
  const staticSettings = {
    domain: process.env.URL || '<http://localhost:8080>',
    thisYear: format(new Date(), 'yyyy'),
  };
  const settings = {...sanitySettings[0], ...staticSettings};

*[_type == "siteSettings"][0].gigs_image.asset->.url

[
  {
    _createdAt: '2019-03-29T10:09:19Z',
    _id: 'siteSettings',
    _rev: 'ns3tjWS9mvqkIfdQ8S1ltp',
    _type: 'siteSettings',
    _updatedAt: '2022-08-29T19:35:34Z',
    email: '',
    gigs_image: { _type: 'image', asset: [Object] },
    image: { _type: 'image', asset: [Object] },
    sharing_image: { _type: 'image', asset: [Object] }
  }
]

const query = groq`*[_type == "siteSettings"]{"url": gigs_image.asset->url}`;
  const image = await client.fetch(query).catch(error => console.error(error));
  
  return image[0].url;

const query = groq`*[_type == "siteSettings"][0].gigs_image.asset->url`;
  const image = await client.fetch(query).catch(error => console.error(error));
  
  return image;

[
  {
    url: '<https://cdn.sanity.io/images/gpygc6vl/production/a7f555027d8a791d9b4dd2915bf4ecbcb3019d36-1600x1600.webp>'
  }
]