Build an object keyed by a field.
Section: Variables, Reduce, and Advanced Transformations
Reduce array into object map
bash
bash
echo '[{"id":1,"name":"a"},{"id":2,"name":"b"}]' | jq 'reduce .[] as $item ({}; .[$item.id|tostring] = $item.name)'Explanation
This pattern is common when converting lists into keyed lookup tables.
Learn the surrounding workflow
Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.
Related commands
Same sheet · prioritizing Variables, Reduce, and Advanced Transformations
Convert object to entries array
Represent an object as key-value entry objects.
Convert entries back to object
Turn key-value entry objects into a normal object.
Recursively transform all strings
Walk the document and mutate matching values.