WP rest api post requestq

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Hello,
I am using wordpress 4.7.1 and i want to use wordpress rest api that came with latest version.
WP Rest API is working fine with GET request but not POST request. I am not able create any post with the POST request.
I am getting these response for every time i tried.

{
  "code": "rest_cannot_create",
  "message": "Sorry, you are not allowed to create posts as this user.",
  "data": {
    "status": 401
  }
}

Please help to solve this asap