disast.rs :: jq :: json query :: jq

So much to love.

Cookbook stuff

String concatenation

Perform concatenation within parenthesis:

jq

Variable interpolation

Use the --arg cli argument to pass variables through to the filter expression:


        jq '(.foo + "..." + .moo)' <<< '{"foo": "fah", "moo":"min"}'
    > "fah...min"
    
FAV="redbean mochi"
cat desserts.json | jq --arg preferredFlavor "$FAV" '.[] | select(.flavor == $preferredFlavor)'
    
    You can also safely build json objects in the cli this way.
    String interpolation
    Use \(...) to interpolate query results into strings delimited with quotes:
    echo '{"foo": "bar"}' | jq '"foo = \(.foo)"'
> "foo = bar"


    Outputting
    Select keys from json
    # use `{}` operator to construct json object
echo '{"one": "two", "buckleMy": "shoe", "three": "four"}' | jq '. | {buckleMy: .buckleMy}'
> { "buckleMy": "shoe" }
# equivalent shorthand, specify key without leading `.`
echo '{"one": "two", "buckleMy": "shoe", "three": "four"}' | jq '. | {buckleMy}'
> { "buckleMy": "shoe" }