Issue sending a JSON object to Stripe - node.js

Question

I am trying to send a JSON Object to Stripe, but I am always receiving an error from the response.
API resolved without sending a response for /api/ctrlpnl/products_submit, this may result in stalled requests.
{
error: {
code: 'parameter_unknown',
doc_url: 'https://stripe.com/docs/error-codes/parameter-unknown',
message: 'Received unknown parameter: {"name":"dasdas"}',
param: '{"name":"dasdas"}',
type: 'invalid_request_error'
}
}
My code is below:
import Stripe from 'stripe';
import { NextApiRequest, NextApiResponse } from 'next';
const stripe = new Stripe(process.env.STRIPE_SECRET_KEY, {
apiVersion: '2020-08-27'
});
export default async function handler(req: NextApiRequest, res: NextApiResponse) {
if (req.method === 'POST') {
try {
const name = { name: req.body.name };
fetch(`${process.env.BASE_URL}/v1/products`, {
method: 'POST',
body: JSON.stringify(name),
headers: {
'Accept': 'application/json',
"content-type": 'application/x-www-form-urlencoded',
Authorization: `Bearer ${process.env.STRIPE_SECRET_KEY}`,
}
}).then((response) => {
return response.json();
}).then(data => {
console.log(data);
res.status(200).json(data)
})
} catch (err) {
res.status(err.statusCode || 500).json(err.message);
}
} else {
res.setHeader('Allow', 'POST');
res.status(405).end('Method Not Allowed');
}
}

Answer 1

The content-type of the fetch is correctly set to application/x-www-form-urlencoded, but the body contains a json. So Stripe is unable to parse the body parameters.
To fix that, you need to replace JSON.stringify by new URLSearchParams:
const name = { name: req.body.name };
fetch(`${process.env.BASE_URL}/v1/products`, {
method: 'POST',
body: new URLSearchParams(name), // ← this will return "name=xxxx"
headers: {
'Accept': 'application/json',
'Content-Type': 'application/x-www-form-urlencoded',
'Authorization': `Bearer ${process.env.STRIPE_SECRET_KEY}`,
}
});
Note that I recommend using the Stripe library which is much simpler to use: stripe.products.create(name);, especially since you already included it in your code.