On 2025-03-20 03:53, Saku Ytti via NANOG wrote:
On Thu, 20 Mar 2025 at 05:58, Jakob Heitz (jheitz) via NANOG <nanog@lists.nanog.org> wrote:
XR has “show operational … json” or “… xml” commands. For example: RP/0/0/CPU0:R5#show operational Interfaces InterfaceBriefTable InterfaceBrief/InterfaceName=GigabitEthernet0/0/0/0 json
I think it's important to also know that in Junos |display json|xml is guaranteed, because CLI is not the 1st class citizen (except for some PFE/shell commands, but most never use those once). CLi does XML RPC calls and the structured XML data is the first-class citizen. There is a static transform from the XML RPC into JSON, no one has to write any code for JSON coverage of new commands.
Yes, all of this, but it's probably worth noting that there, at least in the past, have been some JunOS management cli commands that just ran a shell command and dumped the output, therefore not supporting "| display json". A lot of the NTP commands used to be this way, though I think in later releases they've updated that to support the json display on them. Are there other commands that still do this? I'm personally not aware of anything, but it's posslbe. Additionally, that static transform into JSON from XML results in some really horrendous json to work with. It is workable, but it's not fun. This only applies to state data, the json rendering of config info "show config ... | display json" is as you would expect. There is a config switch that purports to output "compact" json for state commands, but it generates (usually) invalid json (doesn't put lists into "[...]"). -- Jeff McAdams