fetch http request err 500

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Hi,
When using HTTP requests, you should return a response and not a JSON object. For that purpose, you can use the OK response as explained here . Make sure to set the header response and an informative message so that you know if the object was updated or not:

import wixData from 'wix-data';
import {ok} from 'wix-http-functions';

export async function get_updateDonation(request) {
 //query a collection to find matching items
 //=========================================
 let options = {
 "headers": {
 "Content-Type": "application/json"
        }
    };
 // return ok(options);
 if (request.path.length === 0) {
        options.body = {
            found: false,
            message: 'No parameter given'
        }
 return ok(options);
    }

 const results = await wixData.query("Donations")
        .eq("_id", request.path[0])
        .find();

 if (results.items.length > 0) {
 //update donation
 //===============
 let toUpdate = {
 "_id": request.path[0],
 "name": results.items[0].name,
 "phone": results.items[0].phone,
 "email": results.items[0].email,
 "country": results.items[0].country,
 "address": results.items[0].address,
 "swimmer": request.path[2],
 "amount": request.path[4]
        };
 try {
 let updated = await wixData.update("Donations", toUpdate);
            options.body = {
                updateResult: updated
            }
        } catch(err) {
            options.body = {
                updateResult: err
            }
        }
 return ok(options);
    }
    options.body = {
        found: false,
        message: 'Item was not found'
    }
 return ok(options);
}

I hope it’s clearer now.

Best,
Tal.