How to pass query parameters to a url inside a lambda function (netlify environment) - reactjs

Question

When the user submit a search form I want to add the query parameter to the api url that is inside a lambda function.
I set up the netlify environment inside a react app and initialize a lambda function.Now I only get the response using hard-coded queries.
How can I pass parameters to the event.queryStringParameters?
exports.handler = function(event, context, callback) {
const API_PARAMS = qs.stringify(event.queryStringParameters);
const { API_TOKEN, API_URL } = process.env;
const URL = `${API_URL}search?part=snippet&maxResults=5&key=${API_TOKEN}&q=animals`;
// Let's log some stuff we already have.
console.log("Injecting token to", API_URL);
console.log("logging event.....", event);
console.log("Constructed URL is ...", URL);
console.log('params are...', API_PARAMS);
const pass = body => {
callback(null, {
statusCode: 200,
body: JSON.stringify(body)
});
};
const get = () => {
axios
.get(URL)
.then(response => {
console.log(response.data);
pass(response.data);
})
.catch(err => pass(err));
};
if (event.httpMethod == "GET") {
get();
}
};
App.js
componentDidMount() {
fetch('.netlify/functions/youtube')
.then(response => response.json())
.then(data => console.log(data));
}

Answer 1

this took me a minute to figure out but it's in the query string:
let thing = 123;
fetch(`/.netlify/functions/${filename}?item=${thing}`)
.then(response => response.json())
.then(json => console.log(json))
if it's a post, you will need to parse it from the query but a regular get call you can pull it out of the event.queryStringParameters