The "json" command:

Usage: fossil json SUBCOMMAND ?OPTIONS?

In CLI mode, the -R REPO common option is supported. Due to limitations
in the argument dispatching code, any -FLAGS must come after the final
sub- (or subsub-) command.

The -json-input FILE option can be used to read JSON data and process
it like the HTTP interface would. For example:

  fossil json -json-input my.json

The commands include:

  anonymousPassword
  artifact
  branch
  cap
  config
  diff
  dir
  g
  login
  logout
  query
  rebuild
  report
  resultCodes
  stat
  tag
  timeline
  user
  version (alias: HAI)
  whoami
  wiki

Run 'fossil json' without any subcommand to see the full list (but be
aware that some listed might not yet be fully implemented).