API Request to Update Single Field via http functions

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@heatherzirajones
I am surely not the best choice for help in this case, but take a look at this example one…

Perhaps you will find some differences between it and your own version.

import {created, serverError} from 'wix-http-functions';
import wixData from 'wix-data';

export function post_myFunction(request) {
 let options = {
 "headers": {
 "Content-Type": "application/json"
    }
  };
 // get the request body
  return request.body.text()
    .then( (body) => {
 // insert the item in a collection
      return wixData.insert("myUserCollection", JSON.parse(body));
    } )
    .then( (results) => {
      options.body = {
 "inserted": results
      };
      return created(options);
    } )
 // something went wrong
    .catch( (error) => {
      options.body = {
 "error": error
      };
      return serverError(options);
    } );
}

And here another one, out of the mentioned example…

export function post_rating(request) {
 let options = {
 "headers": {
 "Content-Type": "application/json"
        }
    };
 // get the request body
    return request.body.json()
    .then((body) => {
        return updateStatistics(body["_id"], body["rating"]);
    })
    .then((results) => {
        options.body = {
 "inserted": results
        };
        return created(options);
    })
 // something went wrong
    .catch((error) => {
        options.body = {
 "error": error
        };
        return serverError(options);
    });
}

async function updateStatistics(productId, rating) {
 // Get the rating statistics for the current recipe from the "Ratings" collection.
 let stats = await wixData.get('Ratings', productId);
 // If statistics data already exist for this recipe:
 if (stats) {
        stats.rating += rating; // Add the new rating to the total rating points.
        stats.count += 1;       // increment to indicate one more rating
 // Update the new product statistics in the "review-stats" collection.  
        return wixData.update('Ratings', stats)
    }
 //If no statistics data exists for this product, create a new statistics item. 
    stats = {
 // Set the statistics item's ID to the current recipe's ID.
        _id: productId,
 // Set the statistics item's rating to the rating entered by the user.
        rating: rating,
 // Set the statistics item's ratings count to 1 because this is the first rating.
        count: 1
    };
 // Insert the new recipe statistics item into the Ratings collection.
    return wixData.insert('Ratings', stats)
}

Link: Velo: Exposing a Site API with HTTP Functions | Help Center | Wix.com