Async Fetch JSON POST

cors.error

Getting cors errors using lambda? make sure your lambda response as well as your api gateway has cors established

(in your lambda response)
headers: {
  'Content-Type': 'application/json',
  'Access-Control-Allow-Origin': '*'
}

fetch.js

const post = async (url, body, cb) => {
    const opts = {
        headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json'
        },
        method: "POST",
        body: JSON.stringify(body)
    };
    try {
        const response = await fetch(url, opts);
        const responseBody = await response.json();
        return cb(null, responseBody);
    } catch (err) {
        return cb(err);
    }
};