Pass an Array as a query String Parameter node.js - arrays

Question

How can I pass an array as a query string parameter?
I've tried numerous ways including adding it to the path but i'm not able to pull the array on the back end.
If I hard code the array it works fine, but when I try to pass the array from my front end to the backend it does not work properly.
Can anyone point me in the right direction?
FrontEnd
function loadJob() {
return API.get("realtorPilot", "/myTable/ListJobs", {
'queryStringParameters': {
radius,
availableServices,
}
});
BackEnd
import * as dynamoDbLib from "./libs/dynamodb-lib";
import { success, failure } from "./libs/response-lib";
export async function main(event, context) {
const data = {
radius: event.queryStringParameters.radius,
availableServices: event.queryStringParameters.availableServices,
};
// These hold ExpressionAttributeValues
const zipcodes = {};
const services = {};
data.radius.forEach((zipcode, i) => {
zipcodes[`:zipcode${i}`] = zipcode;
});
data.availableServices.forEach((service, i) => {
services[`:services${i}`] = service;
});
// These hold FilterExpression attribute aliases
const zipcodex = Object.keys(zipcodes).toString();
const servicex = Object.keys(services).toString();
const params = {
TableName: "myTable",
IndexName: "zipCode-packageSelected-index",
FilterExpression: `zipCode IN (${zipcodex}) AND packageSelected IN (${servicex})`,
ExpressionAttributeValues : {...zipcodes, ...services},
};
try {
const result = await dynamoDbLib.call("scan", params);
// Return the matching list of items in response body
return success(result.Items);
} catch (e) {
return failure(e.message);
}
}

Answer 1

Pass a comma seperated string and split it in backend.
Example: https://example.com/apis/sample?radius=a,b,c,d&availableServices=x,y,z
And in the api defenition split the fields on comma.
const data = {
radius: event.queryStringParameters.radius.split(','),
availableServices: event.queryStringParameters.availableServices.split(',')
};