Change request body

[jucian0]

I would like to change the recover some values from cookies and add it into the request body, I also need to decode JWT token to make some validations.

Error: The CloudFront function returned an invalid value: the request object has an unexpected field.

`async function handler(event) {
var request = event.request
var cookies = request.cookies
var host = request.headers.host.value;
var decodeIdToken = jwt_decode(jwtToken, key);

// some validations based on decodedToken//

request.body={
    data:{
    access_token:cookies['access_token'],
    refresh_token: cookies['refresh_token'],
    client_id: cookies['client_id'],
    grant_type: 'refresh_token',
    }
}
 
return request;

}`