json parse output problem . SyntaxError: Unexpected token o

[Roelof Wobben]

Hello,

I have this :

~~~

var user = {
  username: 'The Reddest',
  email: 'bra...@switchonthecode.com',
  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.

Roelof

[mscdex]

On Wednesday, January 21, 2015 at 12:04:15 PM UTC-5, Roelof Wobben wrote:

var user = {

  username: 'The Reddest',
  email: 'bra...@switchonthecode.com',
  firstName: 'Brandon',
  lastName: 'Cannaday'
};

JSON.parse(user, function (k, v) {
    console.log(k);           
    return v;                
})

`user` is already an object (not JSON), so there is nothing to parse. You would have to `JSON.stringify(user)` first and parse that result for that code to work.

[William Kapke]

It looks like you're wanting to stringify the object instead of parse it.

-Wm

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[Rick Waldron]

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

[Alexander Behrens]

JSON.parse expects a string as an argument, not an object.

[Adrien Risser]

You should have a better look at JSON.parse documentation.
This method doesn't take an object.

Cheers,

--
Adrien Risser, 
Node.js Consultant
+33 6 59 60 32 58