How to get the JSON body from a POST request in a Cloudflare Worker
Posted on August 28, 2024
To handle a JSON body in a POST request within a Cloudflare Worker, follow these steps:
- Check the HTTP Method: Ensure that the request method is
POSTbefore attempting to parse the body.
if (request.method === "POST") {
// proceed with handling the request
}
- Parse the JSON Body: Use a
try-catchblock to handle potential parsing errors when retrieving the JSON body from the request. This prevents your worker from failing if the body is missing or malformed.
let body = null;
try {
body = await request.json();
} catch (e) {
return new Response('Missing body: ' + e.message, {status: 400});
}
- Handle Empty Body: After attempting to parse the body, you should check if it is
nullor empty. If it is, respond accordingly.
if (!body) {
return new Response("Body empty", {status: 400});
}
- Extract and Use the Data: Once the JSON body is successfully parsed, you can extract the data and proceed with your logic.
const { message } = body || {};
- Complete Example:
async function handleRequest(request) {
if (request.method === "POST") {
let body = null;
try {
body = await request.json();
} catch (e) {
return new Response('Missing body: ' + e.message, {status: 400});
}
if (!body) return new Response("Body empty", {status: 400});
const { message } = body || {};
// Further processing with 'message' or other extracted data
return new Response(`Received message: ${message}`, {status: 200});
}
return new Response("Method not allowed", {status: 405});
}
This code ensures that your Cloudflare Worker robustly handles a JSON body in a POST request while providing useful feedback if something goes wrong.