test.js

var jsonfile = require('jsonfile')

const target_path = './data.json';

jsonfile.readFile(target_path, (err, file) => {
    // var file = JSON.parse(file);
    function start(parentObj, obj) {
        var keyArr = Object.keys(obj);
        keyArr.forEach(key => {
            switch (typeof(obj[key])) {
                case 'string':
                    if (Array.isArray(parentObj)) {
                        parentObj[0][key] = "String"
                    } else {
                        parentObj[key] = "String"
                    }
                    break;
                case 'number':
                    if (Array.isArray(parentObj)) {
                        parentObj[0][key] = "Number"
                    } else {
                        parentObj[key] = "Number"
                    }
                    break;
                case 'object':
                    if (Array.isArray(obj[key])) {
                        parentObj[key] = [{}]
                        parentObj[key] = start(parentObj[key], obj[key][0])
                    } else {
                        parentObj[key] = {}
                        parentObj[key] = start(parentObj[key], obj[key])
                    }
                    break;
                default:

                    break;
            }
        })
        return parentObj;
    }
    const exportFile = start({}, file);
    jsonfile.writeFile('./typelize-result.json', exportFile, {
        spaces: 2
    }, function (err) {
        if (err) {
            console.log(err)
        }
    })
})