CODEWITHSUNDEEP
jsonconditional-statementsjq
Piotr Pawlak
Piotr Pawlak

Reputation: 37

How to set up conditional jq transform?

I need to transform a JSON, which can either have 1 value or 2. So it can be:

{"form":{"textinput1":"aaa"},"params":{"context":""}}

or

{"form":{"textinput1":"aaa"},"params":{"context": "something"}}

And the output I need is this:

{"input": {"text": "aaa"}}

or

{"input": {"text": "aaa"},"context": "something"}}

JQ Transform would be:

{"input": {"text": .form.textinput1}}

or

{"input": {"text": .form.textinput1},"context":.params.context}

But how to merge these two into a condition?

Upvotes: 3

Views: 1802

Answers (2)

peak
peak

Reputation: 116740

jq has two basic conditionals: if ... then ... else ... end and A // B. In your case, the first suffices:

{"input": {"text": .form.textinput1}}
+ (.params.context | if . == "" then null else {"context":.} end)

If you need to apply some transformation, say f, to .context if it is not “”, then replace the final . by f.

Upvotes: 3

RomanPerekhrest
RomanPerekhrest

Reputation: 92854

jq solution:

jq '.params.context as $ctx 
    | {input: {text:.form.textinput1}} 
    + (if ($ctx | length) > 0 then {context:$ctx} else {} end)' file.json
  • .params.context as $ctx - assign .params.context value into variable $ctx
  • if ($ctx | length) > 0 - check if $ctx is not empty

Upvotes: 1

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