dernorberto

jq lessons

June 28, 2026•143 words

jq filters

map

  • map(f) applies filter f to each element and collects results
  • e.g. run an operation on every element of the array and output an array with the results

foreach

  • foreach is like reduce but outputs at each step
    • foreach EXPR as $var (INIT; UPDATE; EXTRACT)

paths()

  • paths() all paths as arrays
  • leafpath paths to all leaf values
    • {"name":"Alice","age":30,"address":{"city":"Berlin","zip":"10115"}}
      • paths(scalars) | join(".") or leaf_paths | join(".")
        • result: 
"name"
"age"
"address.city"
"address.zip"

lessons/exercises

type resource rating
exercises https://learnjq.dev/ 5
examples https://ishan.page/blog/2023-11-06-jq-by-example/ 4
exercises and examples https://exercism.org/tracks/jq 4
examples https://remysharp.com/drafts/jq-recipes ?
examples https://mosermichael.github.io/jq-illustrated/dir/content.html ?
examples https://jqlang.org/tutorial/ ?

sample data

https://services.odata.org/v4/northwind/northwind.svc/Customer_and_Suppliers_by_Cities
https://feed-prod.unitycms.io/2/newest?count=50

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