How do i display the output of systemd journalctl in json?
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Output in json one line.
$ journalctl -u postfix.service -o json { "__CURSOR" : "s=50dd9f837d0443828a9615806689fafd;i=ed;b=be3520dd2daf4ec4b24ce31885d8de37;m=38c62a7;t=5 { "__CURSOR" : "s=50dd9f837d0443828a9615806689fafd;i=102;b=be3520dd2daf4ec4b24ce31885d8de37;m=39db7d4;t= { "__CURSOR" : "s=50dd9f837d0443828a9615806689fafd;i=103;b=be3520dd2daf4ec4b24ce3
Output in json over multiple lines, know as json-pretty.
$ journalctl -u postfix.service -o json-pretty { "__CURSOR" : "s=50dd9f837d0443828a9615806689fafd;i=ed;b=be3520dd2daf4ec4b24ce31885d8de37;m=38c62 "__REALTIME_TIMESTAMP" : "1549192590410951", "__MONOTONIC_TIMESTAMP" : "59531943", "_BOOT_ID" : "be3520dd2daf4ec4b24ce31885d8de37", "PRIORITY" : "6", "_UID" : "0", "_GID" : "0", "_MACHINE_ID" : "6dee5c9f241a493fb69d3d375c4d59fa", "SYSLOG_FACILITY" : "3", "SYSLOG_IDENTIFIER" : "systemd", "_TRANSPORT" : "journal", "_PID" : "1", "_COMM" : "systemd", ... ... ...
Other output formats from Man page.
-o, --output= Controls the formatting of the journal entries that are shown. Takes one of the following options: short is the default and generates an output that is mostly identical to the formatting of classic syslog files, showing one line per journal entry. short-iso is very similar, but shows ISO 8601 wallclock timestamps. short-precise is very similar, but shows timestamps with full microsecond precision. short-monotonic is very similar, but shows monotonic timestamps instead of wallclock timestamps. verbose shows the full-structured entry items with all fields. export serializes the journal into a binary (but mostly text-based) stream suitable for backups and network transfer (see Journal Export Format[1] for more information). json formats entries as JSON data structures, one per line (see Journal JSON Format[2] for more information). json-pretty formats entries as JSON data structures, but formats them in multiple lines in order to make them more readable by humans. json-sse formats entries as JSON data structures, but wraps them in a format suitable for Server-Sent Events[3]. cat generates a very terse output, only showing the actual message of each journal entry with no metadata, not even a timestamp.
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