demo.js

log(msg) {
        let webhook_url = 'thewebhoooklink';

        let params = {
            username: 'ABC',
            content: msg,
        };

        return axios({
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
            },
            data: JSON.stringify(params),
            url: webhook_url,
        });
    }

curl -H "Content-Type: application/json" -X POST -d '{"content":"'"YOUR WHAT EVER MESSAGE "'"}' $url