Cannot read json object value from via postman

[Duy Nguyen]

Hi, 

I'm developing rest service using Express framework, I used Postman to test this web service, but I got this headache scenario need your help.

1. api method: /contents (POST)

2. request body (on Postman) (x-www-form-urlencoded):

  contents[0] : {file_name: 'abc.txt'}

  contents[1]: {file_name: 'xyz.txt'}

3. server:

 var contents = req.body.contents;

 console.log(contents[0]); //can see value here in string format with all information

 console.log(contents[0].file_name); // undefined??

I want to read attribute file_name, how I can do that?

Thanks,

--

Nguyen Hai Duy
Mobile : 0914 72 1900

Skype: nguyenhd2107

[Aria Stewart]

On Feb 21, 2016, at 21:47, Duy Nguyen <nguyen...@gmail.com> wrote:

Hi, 

I'm developing rest service using Express framework, I used Postman to test this web service, but I got this headache scenario need your help.

1. api method: /contents (POST)

2. request body (on Postman) (x-www-form-urlencoded):

  contents[0] : {file_name: 'abc.txt'}

  contents[1]: {file_name: 'xyz.txt'}

3. server:

 var contents = req.body.contents;

 console.log(contents[0]); //can see value here in string format with all information

 console.log(contents[0].file_name); // undefined??

contents[0] is a string -- if you want to parse it to see it as an object, JSON.parse it.

[Duy Nguyen]

Thanks for your hint Aria.

But even I use JSON.parse, it throws error when parsing, maybe my json string is not in right format?

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[Ryan Schmidt]

On Feb 21, 2016, at 10:58 PM, Duy Nguyen <nguyen...@gmail.com> wrote:

> On Mon, Feb 22, 2016 at 10:34 AM, Aria Stewart <ared...@dinhe.net> wrote:
>
>> On Feb 21, 2016, at 21:47, Duy Nguyen <nguyen...@gmail.com> wrote:
>>
>>> I'm developing rest service using Express framework, I used Postman to test this web service, but I got this headache scenario need your help.
>>> 1. api method: /contents (POST)
>>> 2. request body (on Postman) (x-www-form-urlencoded):
>>> contents[0] : {file_name: 'abc.txt'}
>>> contents[1]: {file_name: 'xyz.txt'}
>>> 3. server:
>>> var contents = req.body.contents;
>>> console.log(contents[0]); //can see value here in string format with all information
>>> console.log(contents[0].file_name); // undefined??
>>
>> contents[0] is a string -- if you want to parse it to see it as an object, JSON.parse it.
>

> Thanks for your hint Aria.
>
> But even I use JSON.parse, it throws error when parsing, maybe my json string is not in right format?

Correct, your strings are valid JavaScript, but *NOT* valid JSON. For it to be valid JSON, the attribute values have to be "double-quoted", not 'single-quoted'. The attribute names also have to be "double-quoted" instead of not quoted at all.

[Duy Nguyen]

Thanks Ryan.

I resolved it, we need double quote for both key =&value, so final format is:

{"file_name": "test.txt"}

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