how to convert values to title case in jolt transform

Question

I need to convert all values of country to Title case like "Russia".

[
  {
    "name": "Mehari",
    "country": "russia",
    "age": 50
  },
  {
    "name": "Helen",
    "country": "Norway",
    "age": 20
  },
  {
    "name": "Abdu",
    "country": "India",
    "age": 30
  }
]

What I did

[
  {
    "operation": "modify-overwrite-beta",
    "spec": {
      "*": {
        "country": "=toTitleCase(@(1,&))"
      }
    }
  }
]

Output: no change.

[
  {
    "name": "Mehari",
    "country": "russia",
    "age": 50
  },
  {
    "name": "Helen",
    "country": "Norway",
    "age": 20
  },
  {
    "name": "Abdu",
    "country": "India",
    "age": 30
  }
]

Answer 1

I think the following JOLT spec can work in your case:

[{
    "operation": "modify-overwrite-beta",
    "spec": {
        "*": {
            "country": "=split('',@(1,&))"
        }
    }
}, {
    "operation": "modify-overwrite-beta",
    "spec": {
        "*": {
            "country": {
                "[0]": "=toUpper(@(0))"
            }
        }
    }
}, {
    "operation": "modify-overwrite-beta",
    "spec": {
        "*": {
            "country": "=join('',@0)"
        }
    }
}]