Is there a standard ethical codex for publishing of research?
The Committee on Publication Ethics (https://publicationethics.org/) &quot;is a nonprofit organization whose mission is to define best practice in the ethics of scholarly publishing and to assist editors, publishers, etc. to achieve this.&quot;
They have many documents; you can probably start with their core practices.  These cover:

Allegations of misconduct
Authorship and contributorship
Complaints and appeals
Conflicts of interest / Competing interests
Data and reproducibility
Ethical oversight
Intellectual property
Journal management
Peer review processes
Post-publication discussions and corrections

(Note that this focuses on publication ethics.  If you want research ethics then that would be a separate question.)