Unable to fetch Data in Netlify Dev Proxy (React) - reactjs

Question

I've been having CORS error when deploying my app so I decided to try out Netlify Dev.
I followed all steps of the written tutorials but I keep getting errors without being able to identify whats wrong. I haven't even deployed it yet and right now I am having the 403 error, before this was the 500 internal server error.
Please let me know if you notice any obvious mistake on my part.
Here's the node-fetch code:
const fetch = require("node-fetch");
exports.handler = async function () {
const headers = {
"x-api-key": process.env.REACT_APP_MY_API_KEY,
"content-type": "application/json",
};
try {
const response = await fetch("https://api.crimeometer.com", { headers });
if (!response.ok) {
return { statusCode: response.status, body: response.statusText };
}
const data = await response.json();
return {
statusCode: 200,
body: JSON.stringify(data),
};
} catch (err) {
console.log(err);
return {
statusCode: 500,
body: JSON.stringify({ msg: err.message }),
};
}
};
Here's the frontend of my app (with the relevant code):
const initializeApp = useCallback(() => {
async function fetchData() {
try {
let req = new Request(
`./.netlify/functions/node-fetch?lat=${lat}&lon=${lon}&distance=10km&datetime_ini=${newdateyear}&datetime_end=${newdatenow}&page=1`);
const res = await fetch(req);
const info = await res.json();
setCrimes(info.incidents);
} catch (err) {
console.log(err);
}
}
}, [submit, lat, lon]);
useEffect(() => {
initializeApp();
}, [initializeApp]);
This is the error in my console:
This is where i am trying to fetch data from:
https://api.crimeometer.com/v1/incidents/raw-data?lat=${lat}&lon=${lon}&distance=10km&datetime_ini=${newdateyear}&datetime_end=${newdatenow}&page=1
It requires two headers to be set on frontend, which I have done in the netlify function

Answer 1

The API key is currently being added to the React side, where it sets a header and makes a call to the netlify function. But the API key is actually required at the netlify function to request the third party API.
So you have to move the request header from React to Netlify function with something like:
const headers = {
'x-api-key': API_KEY,
'content-type': 'application/json',
}
const response = await fetch(
"https://api.crimeometer.com/v1/incidents/raw-data",
{ headers }
);