---
title: JSON Objects
description: "> ## Object Syntax > > > > ### Example > > > > `{ \"name\":\"John\", \"age\":30, \"car\":null }` > > > > JSON objects are surrounded by curly braces {}. > > > > JSON objects are written in…"
url: "https://apprentice.mn/docs/json-objects/"
updated: "2021-05-19"
category: Javascript
---

# JSON Objects

> ## Object Syntax
>
>
>
> ### Example
>
>
>
> `{ "name":"John", "age":30, "car":null }`
>
>
>
> JSON objects are surrounded by curly braces {}.
>
>
>
> JSON objects are written in key/value pairs.
>
>
>
> Keys must be strings, and values must be a valid JSON data type (string, number, object, array, boolean or null).
>
>
>
> Keys and values are separated by a colon.
>
>
>
> Each key/value pair is separated by a comma.

## Accessing Object Values

You can access the object values by using dot (.) notation:

### Example

      `myObj = { "name":"John", "age":30, "car":null };
x = myObj.name;`

You can also access the object values by using bracket (\[\]) notation:

### Example

              `myObj = { "name":"John", "age":30, "car":null };
x = myObj["name"];`

## Looping an Object

You can loop through object properties by using the for-in loop:

### Example

              `myObj = { "name":"John", "age":30, "car":null };
for (x in myObj) {
  document.getElementById("demo").innerHTML += x;
}`

In a for-in loop, use the bracket notation to access the property *values*:

### Example

              `myObj = { "name":"John", "age":30, "car":null };
for (x in myObj) {
  document.getElementById("demo").innerHTML += myObj[x];
}`

## Nested JSON Objects

Values in a JSON object can be another JSON object.

### Example

              `myObj = {
  "name":"John",
  "age":30,
  "cars": {
    "car1":"Ford",
    "car2":"BMW",
    "car3":"Fiat"
  }
 }`

You can access nested JSON objects by using the dot notation or bracket notation:

### Example

              `x = myObj.cars.car2;
// or:
x = myObj.cars["car2"];`

## Modify Values

You can use the dot notation to modify any value in a JSON object:

### Example

              `myObj.cars.car2 = "Mercedes";`

 

You can also use the bracket notation to modify a value in a JSON object:

### Example

      `myObj.cars["car2"] = "Mercedes";`

## Delete Object Properties

Use the `delete` keyword to delete properties from a JSON object:

### Example

      `delete myObj.cars.car2;`        [https://www.addtoany.com/add_to/facebook?linkurl=https%3A%2F%2Fapprentice.mn%2Fdocs%2Fjson-objects%2F&linkname=JSON%20Objects](https://www.addtoany.com/add_to/facebook?linkurl=https%3A%2F%2Fapprentice.mn%2Fdocs%2Fjson-objects%2F&linkname=JSON%20Objects)[https://www.addtoany.com/add_to/mastodon?linkurl=https%3A%2F%2Fapprentice.mn%2Fdocs%2Fjson-objects%2F&linkname=JSON%20Objects](https://www.addtoany.com/add_to/mastodon?linkurl=https%3A%2F%2Fapprentice.mn%2Fdocs%2Fjson-objects%2F&linkname=JSON%20Objects)[https://www.addtoany.com/add_to/email?linkurl=https%3A%2F%2Fapprentice.mn%2Fdocs%2Fjson-objects%2F&linkname=JSON%20Objects](https://www.addtoany.com/add_to/email?linkurl=https%3A%2F%2Fapprentice.mn%2Fdocs%2Fjson-objects%2F&linkname=JSON%20Objects)[https://www.addtoany.com/share](https://www.addtoany.com/share)