@thgh/tunnelmole/src/logging/client-log.ts

Tunnelmole, an open source ngrok alternative. Instant public URLs for any http/https based application. Available as a command line application or as an NPM dependency for your code. Stable and maintained. Good test coverage. Works behind firewalls

export default interface ClientLog {
    clientId: string;
    eventKey: string;
    eventValue: string; // Literally send it as a string, JSON encoded
}