SyntaxError: Unexpected token \n in JSON at position - json

Question

I have a roblem while directing a request from Cloud Flare workers to my API. When I catch the error I get this:
SyntaxError: Unexpected token \n in JSON at position 240
when I did some research I saw some articles about it being about JSON.parse. But I couldn't find the solution.
Example Request Body:
{"link": "link", "provider": "company", "oauth": "key", "testText": "text"}
Cloud Flare Workers Code:
addEventListener('fetch', function (event) {
const { request } = event;
const response = handleRequest(request).catch(handleError)
event.respondWith(response)
})
async function handleRequest(request) {
const realBody = JSON.parse(`${await request.json()}`
.replace(/\n/g, "\\n")
.replace(/\r/g, "\\r")
.replace(/\t/g, "\\t")
.replace(/\f/g, "\\f"));
const stringifiedJSON = JSON.stringify(realBody);
const init = {
body: stringifiedJSON,
method: "POST",
headers: {
"content-type": "application/json;charset=UTF-8",
},
};
const initLog = {
body: JSON.stringify({ msg: { discountBodyStringified: realBody }}),
method: "POST",
headers: {
"content-type": "application/json;charset=UTF-8",
},
}
const responseLogger = await fetch("https://example.com/log", initLog)
console.log(responseLogger)
console.log(init)
const response = await fetch("https://example.com", init)
return new Response("tweet sent!")
}
function handleError(error) {
console.error('Uncaught error:', error)
const { stack } = error
const initLog = {
body: JSON.stringify({ msg: { error: stack || error }}),
method: "POST",
headers: {
"content-type": "application/json;charset=UTF-8",
},
}
const responseLogger = fetch("https://example.com/log", initLog)
return new Response(stack || error, {
status: 500,
headers: {
'Content-Type': 'text/plain;charset=UTF-8'
}
})
}

Answer 1

problem is not in the code, the problem in request which you are or front app is sending somewhere you lived extra comma or didnt close field.
For example:
{
"name": "Alice",
}
this will give same error as SyntaxError: Unexpected token \n in JSON at position because extra comma is there or
{
"name": "Alice
}
this also will throw error because I didnt close quotes