by

Ciro Santilli (@cirosantilli, 34)

JSON

Table of contents
- JSON trailing comma JSON
- jq JSON
  - jq ignore missing attribute jq

JSON trailing comma

stackoverflow.com/questions/201782/can-you-use-a-trailing-comma-in-a-json-object

The fact that you cannot have trailing commans in lists or dicts as in 3, at:

{
  "asdf": [
    1,
    2,
    3,
  ]
}

is one of the most infuriating design choices of all time!!!

jq (2012-)

jq ignore missing attribute

echo '[{"a": 1, "b": 2}, {"b": 3}]' | jq '.[] | select(.a) | .a'

Output:

and no empty lines as desired.

Bibliography:

stackoverflow.com/questions/42097410/how-to-check-for-presence-of-key-in-jq-before-iterating-over-the-values

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