I have stolen to spec below from here: https://stackoverflow.com/questions/54696540/jolt-transformation-lowercase-all-keys which works in lowercasing all keys, however I ideally need the hyphens between the words. [ { // unwrap the keys and values into literal // "key" : "A", "value" : "b" "operation": "shift", "spec": { "*": { "$": "&1.key", "@": "&1.value" } } }, { "operation": "modify-overwrite-beta", "spec": { "*": { // Now that the origional key // is on the "right hand side" // lowercase it "key": "=toLower" } } }, { // pivot back, the now lowercased keys "operation": "shift", "spec": { "*": { "value": "@(1,key)" } } } ]
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