map array of objects to table in react without using name of the key names

You can do something like this:

NOTE: this is just a sample code please try to create your own logic for better results:

const array1 = [
  { BRANCH: "84", NUM: "1356", COST: "25", METHOD: "15" },
  { BRANCH: "3", NUM: "2134", COST: "425", METHOD: "5" },
  { BRANCH: "4", NUM: "1905", COST: "325", METHOD: "1" },
  { BRANCH: "56", NUM: "2350", COST: "14", METHOD: "9" }
];

const array2 = [{"UNIT":"84", "COST":"25"},
{"UNIT":"3","COST":"425"},
{"UNIT":"4","COST":"325"},
{"UNIT":"56","COST":"14"}]

const Table = ({item}) => {
    const items = Object.entries(item);
    return (
      <td>
        {
          items.map(([key,value]) => {
           return (
              <tr key={value}>{value}</tr>
             )
          })
        }
       </td>
    )
}

const createTable = ({arr}) => {
  return (
    arr.map(item => {
      return <Table {...item} />
    })
  )
};


<CreateTable arr={array1} />
<CreateTable arr={array2} />

I'm not very sure what do you want. I'm guessing you want to use index as keys while using the map method?

const arr = [{"BRANCH":"3","NUM":"2134", "COST":"425","METHOD":"5"},
{"BRANCH":"4","NUM":"1905","COST":"325","METHOD":"1"},
{"BRANCH":"56","NUM":"2350","COST":"14", "METHOD":"9"}] 

const arrMap = arr.map((el,index) => {
  return [{key:index, ...el}]
})

console.log(arrMap)
// [
//   [ { key: 0, BRANCH: '3', NUM: '2134', COST: '425', METHOD: '5' } ],
//   [ { key: 1, BRANCH: '4', NUM: '1905', COST: '325', METHOD: '1' } ],
//   [ { key: 2, BRANCH: '56', NUM: '2350', COST: '14', METHOD: '9' } ]
// ]

Something like this?

  const array1 = [
    { BRANCH: "3", NUM: "2134", COST: "425", METHOD: "5" },
    { BRANCH: "4", NUM: "1905", COST: "325", METHOD: "1" },
    { BRANCH: "56", NUM: "2350", COST: "14", METHOD: "9" }
  ];

  const array2 = [
    { UNIT: "84", COST: "25" },
    { UNIT: "3", COST: "425" },
    { UNIT: "4", COST: "325" },
    { UNIT: "56", COST: "14" }
  ];

  const tempFunc = (arrayItem) => {
    const obj = Object.keys(arrayItem);
    for (let i = 0; i < obj.length; i++) {
      const name = obj[i];
      const value = arrayItem[name];

      console.log("name:", name, " value:", value);
    }
  };

  array1.map((item) => tempFunc(item));
  array2.map((item) => tempFunc(item));