CODEWITHSUNDEEP
jsonkeyjqcase-insensitive
Shang Jian Ding
Shang Jian Ding

Reputation: 2146

reference key case insensitively

How can I express a case insensitive simple key reference in jq?

E.g., I can have:

{
  "key" : "value"
}

or 

{
  "kEy" : "value"
}

but not 

{
  "key" : "value",
  "kEy" : "value"
}

Is there a way to express the .key filter such that it'll catch "key" or "kEy" ?

Upvotes: 2

Views: 496

Answers (2)

Inian
Inian

Reputation: 85825

One way would be to convert all keys to lower-case as a default format and extract the key name of your choice (inspired from this peak's answer)

with_entries( .key |= ascii_downcase ).key

The .key inside with_entries(..) is not to be confused with the key name of your choice, because that is the default name for all key-names when using the family of *entries functions in jq - with_entries, to_entries and from_entries

If your keys are nested inside other objects, one would would be walk through the entire JSON to recursively rename the keys and fetch the field of your choice

def recursive_key_rename:
  walk( if type == "object" then with_entries( .key |= ascii_downcase ) else . end);

recursive_key_rename | .key.anotherkey

See jq-play demo

Upvotes: 3

oguz ismail
oguz ismail

Reputation: 50795

Given i flag, the test builtin matches case-insensitively, you can use it in conjunction with to_entries. E.g.:

to_entries[] | select(.key | test("key"; "i")) .value

Online demo

Upvotes: 4

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