JSON

Consider the following:

{"name":"John", "age":31, "city":"New York"}

Above example is a JSON object. The JSON format is almost identical to JavaScript objects.

Difference 1:
In JSON, keys must be strings, written with double quotes:

{ "name":"John" }

In JavaScript, keys can be strings, numbers, or identifier names:

{ name:"John" }

Difference 2:
In JSON, string values must be written with double quotes:

{ "name":"John" }

In JavaScript, you can write string values with double or single quotes:

{ name:'John' }

We send/receive data from server to client using only string format. Object format is not supported by http.
JSON.parse(): Text(string) to Javascript object/array. Consider, it removes single quotes from both sides of the string.
JSON.stringify():JavaScript function/array to string. Consider, it adds single quote to both sides of the string.

json_encode(): php object to string.

json_decode(): php string to object.

->get(): Returns in a format [{}, {}…]

->fin(): Returns in a format {…}