On Wed Jan 21 2015 at 2:42:55 PM Roelof Wobben <[email protected]> wrote:
> Hello,
>
> I have this :
>
> ~~~
>
> var user = {
> username: 'The Reddest',
> email: '[email protected]',
> firstName: 'Brandon',
> lastName: 'Cannaday'
> };
> JSON.parse(user, function (k, v) {
> console.log(k);
> return v;
> })
>
> ~~~
>
> but when I do node test.js to run the file I see this output :
>
> ~~~
>
>
> undefined:1
>
> [object Object]
>
> ^
>
> SyntaxError: Unexpected token o
>
> at Object.parse (native)
>
> ~~~
>
> Can somone tell me what is the right way to parse and see the output of a
> json file.
>
In the code above, there is an object, not JSON. JSON is the serialized
(string/text) representation of a subset of JavaScript "data". That "data"
can be a string, number, array, object, null, true, or false
```
$ node
> JSON.parse('"a"')
'a'
> JSON.parse('1')
1
> JSON.parse('[]')
[]
> JSON.parse('{}')
{}
> JSON.parse('null')
null
> JSON.parse('true')
true
> JSON.parse('false')
false
```
When you store JSON in a file, like so:
// a.json
{
"name": "Rick",
"age": 33
}
... It must be valid, per the grammar rules of JSON, note the strings are
all double quoted, but the number is not.
// a.js
var fs = require("fs");
fs.readFile("a.json", "utf8", function(err, json) {
// turn the valid json text back into an object.
var object = JSON.parse(json);
console.log(object);
console.log(typeof json);
console.log(typeof object);
});
$ node a.js
{ name: 'Rick', age: 33 }
string
object
Rick
>
>
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