How to parsing JSON string parameters in rails

Question

I send http post from my react app to API like this :

const request = new Request('http://localhost:9000/login', {
  method: 'POST',
  headers: new Headers({"Accept": "application/json", 
              "Content-Type": "application/x-www-form-urlencoded;charset=UTF-8"}),
  body: JSON.stringify({ username: username,
               password: password})
})
return fetch(request)
  .then(response => {
    if (response.status < 200 || response.status >= 300) {
      throw new Error(response.statusText);
    }
    return response.json();
  })
  .then(({ token }) => {
    localStorage.setItem('token', token)
  });

And I debug it in console on my rails app, and this is the output :

<ActionController::Parameters {"{\"username\":\"qqqqqq\",\"password\":\"ssssss\"}"=>nil, "controller"=>"sessions", "action"=>"create"} permitted: false>

How do I parsing the params above, I need get username & password params ?

charliesttrada · Accepted Answer · 2017-02-21 16:17:30Z

4

You could do something like this with native Ruby JSON library:

@json = JSON.parse(request.body.read)
username = @json['username']
password = @json['password']

You take the POST request data and then parse to JSON.

answered Feb 21, 2017 at 16:17

charliesttrada

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1 Comment

Khalid Over a year ago

Thanks charliesttrada

zengraf · Accepted Answer · 2021-05-03 15:09:48Z

1

I might be late to answer, but maybe I can help anyone, who stumbles upon this thread.

In your React application you set the Content-Type header to type application/x-www-form-urlencoded, but your body is in JSON format. Hence, your Rails app does not parse the parameters correctly due to the wrong content type.

The solution would be to set Content-Type to application/json;charset=UTF-8

answered May 3, 2021 at 15:09

zengraf

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Comments

margo · Accepted Answer · 2017-02-21 14:24:42Z

0

rails provides a JSON class that codes and decodes json for you.

answered Feb 21, 2017 at 14:24

margo

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