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(def obj1 {"nested" {"foo" "bar"}})

(def obj2 {"nested" {"foo" "bar"
                     "zot" "baz"}})

(diff obj1 obj2)
=> [{"value" "baz", "op" "add", "path" "/nested/zot"}]

(patch obj1 (diff obj1 obj2))
Exception Unable to set value at '/nested/zot'. Consider adding a more explicit data structure as a child of an existing object.  clj-json-patch.util/add-patch-value (util.clj:131)

(def obj {"array" [{"id" "hello"}]})

(def ops [{"op" "add" "path" "/array/0/foo" "value" "bar"}])

(patch/patch obj ops)

=> {"array" [{"id" "hello", "foo" "bar"} {"id" "hello"}]}

=> {"array" [{"id" "hello", "foo" "bar"}]}

(def obj {"array" [{"name" "item1" "foo" "bar"}
                   {"name" "item2" "foo" "bar"}]})

(def ops [{"op" "remove" "path" "/array/0/foo"}])

(clojure.pprint/pprint (patch obj ops))

{"array"
 [{"name" "item1"}
  {"name" "item1" "foo" "bar"}
  {"name" "item2" "foo" "bar"}]}

{"array"
 [{"name" "item1"}
  {"name" "item2", "foo" "bar"}]}