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Referência JSON JavaScript


JSON ( J ava S cript O bject N otation )

JSON é um formato para armazenar e transportar dados.

JSON é texto, e o texto pode ser transportado para qualquer lugar e lido por qualquer linguagem de programação.

Objetos JavaScript podem ser convertidos em JSON e JSON pode ser convertido novamente em objetos JavaScript.

Dessa forma, podemos trabalhar com os dados como objetos JavaScript, sem análises ou traduções complicadas.

Exemplo

Enviando JSON:

// a JavaScript object...:
var myObj = { "name":"John", "age":31, "city":"New York" };

// ...converted into JSON:
var myJSON = JSON.stringify(myObj);

// send JSON:
window.location = "demo_json.php?x=" + myJSON;

Para um tutorial sobre JSON, leia nosso Tutorial JSON .


Métodos JSON

Method Description
parse() Parses a JSON string and returns a JavaScript object
stringify() Convert a JavaScript object to a JSON string

Tipos de dados válidos

Em JSON, os valores devem ser um dos seguintes tipos de dados:

  • uma linha
  • um número
  • um objeto (contendo valores JSON válidos)
  • uma matriz
  • um booleano
  • nulo

Os valores JSON não podem ser um dos seguintes tipos de dados:

  • uma função
  • um encontro
  • Indefinido

Mais exemplos

Exemplo

Recebendo JSON:

// myJSON is text received in JSON format.
// Convert JSON into a JavaScript object:
var myObj = JSON.parse(myJSON);
document.getElementById("demo").innerHTML = myObj.name;

Exemplo

Armazenando dados como JSON, usando localStorage

// Storing data:
myObj = { "name":"John", "age":31, "city":"New York" };
myJSON = JSON.stringify(myObj);
localStorage.setItem("testJSON", myJSON);

// Retrieving data:
text = localStorage.getItem("testJSON");
obj = JSON.parse(text);
document.getElementById("demo").innerHTML = obj.name;

Saiba mais sobre JSON em nosso tutorial JSON .