Question 66437 in Javascript Question posted in
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How to parse an objects with array index to object array with key value pairs – Javascript

{"SubmitBy":"SK", "Students[0].name":"Jhon", "Students[0].age":"15", "Students[1].name":"Sam", "Students[1].age":"16", "Students[2].name":"Tom", "Students[2].age":15}

Result expecting like this

{SubmitBy:"SK", Students:[{name:"Jhon", age:"15"},{name:"Sam", age:"16"},{name:"Tom", age:"15"} ]}
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3

Answers


  1. 0

    You can use library like dot-prop to achieve this, code below:

    import { setProperty } from 'dot-prop';

const input = {
  SubmitBy: 'SK',
  'Students[0].name': 'Jhon',
  'Students[0].age': '15',
  'Students[1].name': 'Sam',
  'Students[1].age': '16',
  'Students[2].name': 'Tom',
  'Students[2].age': 15
};
const output = {};

for (const [key, value] of Object.entries(input)) {
  setProperty(output, key, value);
}
console.log(output);
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  2. 0 
    const originalData = {"SubmitBy":"SK", "Students[0].name":"Jhon", "Students[0].age":"15", "Students[1].name":"Sam", "Students[1].age":"16", "Students[2].name":"Tom", "Students[2].age":15};

const transformedData = { SubmitBy: originalData.SubmitBy, Students: [] };

for (let i = 0; i < 3; i++) {
  const student = {
    name: originalData[`Students[${i}].name`],
    age: originalData[`Students[${i}].age`].toString(),
  };
  transformedData.Students.push(student);
}

console.log(transformedData);
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  3. 0

    To parse an object with array index to an object array with key-value pairs in JavaScript, you can use the following function:

    function parseObject(input) {
  const result = {};
  Object.keys(input).forEach((key) => {
    const index = key.indexOf("[");
    if (index > -1) {
      const root = key.substring(0, index);
      const subKey = key.substring(index + 1, key.length)
      const indexNum = parseInt(subKey, 10);
      if (!result[root]) {
        result[root] = [];
      }
      if (!result[root][indexNum]) {
        result[root][indexNum] = {};
      }
      result[root][indexNum][subKey.substring(subKey.indexOf(".") + 1)] = input[key];
    } else {
      result[key] = input[key];
    }
  });
  return result;
}
const input = {"SubmitBy":"SK", "Students[0].name":"Jhon", "Students[0].age":"15", "Students[1].name":"Sam", "Students[1].age":"16", "Students[2].name":"Tom", "Students[2].age":15};
const output = parseObject(input);
console.log(output);
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