Format and pretty print log via tail

Question

I have this log file that I check on a frequent basis and because of the format of it, it's quite easier to read when pretty printed. I'd like to do so in a tail.

Logs in the file like:

2019-07-04T09:53:04-07:00   some.package.placeholder.stderr {"log": "The content", "foo": "bar", "baz": "blah"}
2019-07-04T10:15:37-07:00   some.package.placeholder.stderr {"log": "I'm actually", "foo": "bar", "baz": "blah"}
2019-07-04T10:15:37-07:00   some.package.placeholder.stderr {"log": "Interested on", "foo": "bar", "baz": "blah"}

And I want to do something similar to

tail -f myLogFile | grep [...?...] | jq '.log'

So when tailing I get:

The content
I'm actually
Interested on

Or even:

2019-07-04T09:53:04-07:00   The content
2019-07-04T10:15:37-07:00   I'm actually
2019-07-04T10:15:37-07:00   Interested on

Answer 1

With GNU grep for -o:

$ tail file | grep -o '{[^}]*}' | jq -r '.log'
The content
I'm actually
Interested on

With any awk:

$ tail file | awk 'sub(/.*{/,"{")' | jq -r '.log'
The content
I'm actually
Interested on

$ tail file | awk '{d=$1} sub(/.*{/,""){$0="{\"date\": \""d"\", " $0} 1' | jq -r '.date + " " + .log'
2019-07-04T09:53:04-07:00 The content
2019-07-04T10:15:37-07:00 I'm actually
2019-07-04T10:15:37-07:00 Interested on

That last one works by merging the date field from the input into the json so then jq can just select and print it with the log field.