This wiki documents the JSON log format and internal data structures. The sidebar on the right shows the current topics.

Keep in mind that there is some natural variation to deeper data structures that originate in XPCShell. Not all Firefox versions return the same structure for application.ini, AppConstants, and Ci.nsINSSVersion, which tlscanary just passes on blindly. There is also significant variation to the ssl_status and other connection info keys depending on the server's SSL connection state.

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JSON log format

Log action format

Metadata objects

Run metadata
Worker info

XPCShell worker communication

Worker Command
Worker Response
Scan command response