i used this code in nodejs to get data from json but gets error and say undefined
var obj = {payload:'fp_2'};
var myJSON = JSON.stringify(obj);
console.log(myJSON.payload); //output: undefinedand i have same error in javascript
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script>
var obj = {payload:'fp_2'};
var myJSON = JSON.stringify(obj);
document.getElementById("demo").innerHTML = myJSON.payload;
</script>
</body>
</html>what is my error? can any one help me...
obj is already object, you can
var obj = {payload:'fp_2'};
console.log(myJSON.payload);
to parse string to object use JSON.parse
var str = '{"payload": "fp_2"}';
var myJSON = JSON.parse(str);
console.log(myJSON.payload);
JSON.stringify used to convert obejct to string
var obj = {payload:'fp_2'};
var str = JSON.stringify(obj);
console.log(str);
// {"payload":"fp_2"}
What happens in both your example is you are trying to get property "payload" from a string, which does not have this kind of property.
The method JSON.stringify() creates string from any given object, so your custom object with property "payload" was transformed to JS string object, which does not have it anymore.
This is the list of properties, that JS string has:
You can find definition of each property and read more about strings in JS with this link: W3 Schools JS string
If you want to use "payload" from your custom object, you don't need to JSON.stringify() it. Just use it:
var obj = {payload:'fp_2'};
console.log(obj.payload);
// Or in your html example
var obj = {payload:'fp_2'};
document.getElementById("demo").innerHTML = obj.payload;
write this for nodejs
var obj = {payload:'fp_2'};
console.log(obj.payload);
write this for script file
<script>
var obj = {payload:'fp_2'};
document.getElementById("demo").innerHTML = obj.payload;
</script>
JSON.stringify()is just a simple string; there's no "payload" property. You can examineobj.payloadbecause that makes sense. Once you.stringify()it however you just have a string. There's no need to "parse" an object that's declared with an object initializer expression; the object already exists and is ready for use.JSON.stringify(obj)does? It stringifies the object. It returns a string. If you only need thepayloadproperty, you don't need to stringify.