Post request to normal route, not using API middleware - next.js

Question

Below my pages directory i have a few routes (for example "/product/details").
I'm using getServerSideProps() to have the page render server side.
How can i send a POST request containing data in the body to this page directly?
The idea would be that i can do something like this:
export async function getServerSideProps(postData) {
return {
props: {postData.body},
}
}
I've tried console logging "postData". I can see that the post request headers are being sent, but the request body is missing.
Thanks
Edit:
I'm doing the posting using Postman, and i'm sending a raw body of type JSON containing a single key:value. But as i said, the page doesn't seem to receive the posted data.
Here is a code snippet for how i'm sending a post request to a route using puppeteer:
const page = await puppeteerConnection.newPage();
await page.setRequestInterception(true);
await page.once('request', (request) => {
let data = {
'method': 'POST',
'postData': JSON.stringify(jsonData),
'headers': {
...request.headers(),
'Content-Type': 'application/json'
},
};
request.continue(data);
page.setRequestInterception(false);
});
await page.goto('pathToNextJSRoute');

Answer 1

getServerSideProps() accepts a context parameter (which you've named postData in your example) and one of the keys in that object (req) contains the request body you're looking for. It arrives as a readable stream of byte data, though, so you'll need to convert it first:
const streamToString = async (stream) => {
if (stream) {
const chunks = [];
for await (const chunk of stream) {
chunks.push(Buffer.from(chunk));
}
return Buffer.concat(chunks).toString("utf-8");
}
return null;
};
export async function getServerSideProps(context) {
let data = null;
if (context.req.method === "POST") {
const body = await streamToString(context.req);
data = JSON.parse(body);
}
console.log(data);
return {
props: { data },
};
}