Write a program to print all the properties of JavaScript Object

Below function prints all the properties of an object.

function printProperties(object, objectName){

  for(property in object){

    console.log(objectName + "." + property);

  }

}

HelloWorld.js

var employee = {
  "firstName" : "Krishna",
  "lastName" : "Majety",
  "age" : 29,
  "address" : {
    "city" : "Bangalore",
    "area" : "Marthalli"
  }
}

function printProperties(object, objectName){
  for(property in object){
    console.log(objectName + "." + property);
  }
}

printProperties(employee, "employee");

Output

employee.firstName

employee.lastName

employee.age

employee.address

One problem with above function is, it do not print the nested object properties.

For example, employee object has address object in it. Let’s enhance the program to print address object properties also.

HelloWorld.js

var employee = {
  "firstName" : "Krishna",
  "lastName" : "Majety",
  "age" : 29,
  "address" : {
    "city" : "Bangalore",
    "area" : "Marthalli"
  }
}

function printProperties(object, objectName, tab){
  for(property in object){
    console.log(tab + objectName + "." + property); 
    
    if(object[property] instanceof Object){
      printProperties(object[property], objectName+"."+property, "  " + tab);
    }
  }
}

printProperties(employee, "employee", "")

Output

employee.firstName

employee.lastName

employee.age

employee.address

  employee.address.city

  employee.address.area

Let’s further enhance this program to print the value of the object properties.

HelloWorld.js

var employee = {
  "firstName" : "Krishna",
  "lastName" : "Majety",
  "age" : 29,
  "address" : {
    "city" : "Bangalore",
    "area" : "Marthalli"
  }
}

function printProperties(object, objectName, tab){
  for(property in object){
    console.log(tab + objectName + "." + property + " => " + object[property]); 
    
    if(object[property] instanceof Object){
      printProperties(object[property], objectName+"."+property, "  " + tab);
    }
  }
}

printProperties(employee, "employee", "")

Output

employee.firstName => Krishna

employee.lastName => Majety

employee.age => 29

employee.address => [object Object]

  employee.address.city => Bangalore

  employee.address.area => Marthalli

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