How to get the Facebook user id using the access token

Question

I have a Facebook desktop application and am using the Graph API  I am able to get the access token  but after that is done - I don t know how to get the user s ID   My flow is like this      I send the user to https   graph facebook com oauth authorize with all required extended permissions  In my redirect page I get the code from Facebook  Then I perform a HTTP request to graph facebook com oauth access token with my API key and I get the access token in the response    From that point on I can t get the user ID   How can this problem be solved

User · Answer

With the newest API  here s the code I used for it    params   NSDictionary  params                                 access token     FBSDKAccessToken currentAccessToken  tokenString                              fields     id                                 make the API call    FBSDKGraphRequest  request     FBSDKGraphRequest alloc                                initWithGraphPath   me                                parameters params                               HTTPMethod   GET      request startWithCompletionHandler   FBSDKGraphRequestConnection  connection                                        id result                                        NSError  error        NSDictionary  res   result        res is a dict that has the key     NSLog  res objectForKey   id

User · Answer

You just have to hit another Graph API   https   graph facebook com me access token  access-token    It will give your e-mail Id and user Id  for Facebook  also

User · Answer

You can use below code on onSuccess LoginResult loginResult      loginResult getAccessToken   getUserId

User · Answer

The easiest way is   https   graph facebook com me fields id amp access token  xxxxx    then you will get json response which contains only userid

User · Answer

in FacebookSDK v2 1  I can t check older version   We have  NSString  currentUserFBID    FBSession activeSession  accessTokenData userID    However according to the comment in FacebookSDK   discussion This may not be populated for login behaviours such as the iOS system account   So may be you should check if it is available  and then whether use it  or call the request to get the user id

User · Answer

If you want to use Graph API to get current user ID then just send a request to   https   graph facebook com me access token

User · Answer

Check out this answer  which describes  how to get ID response  First  you need to create method get data   const https   require  https    getFbData    accessToken  apiPath  callback    gt        const options             host   graph facebook com           port  443          path     apiPath access token   accessToken       apiPath example    me friends          method   GET              let buffer          this buffer will be populated with the chunks of the data received from facebook     const request   https get options   result    gt            result setEncoding  utf8            result on  data    chunk    gt                buffer    chunk                       result on  end        gt                callback buffer                            request on  error    e    gt            console log  error from facebook getFbData    e message                 request end        Then simply use your method whenever you want  like this   getFbData access token    me fields id amp     result    gt          console log result

User · Answer

The facebook acess token looks similar too  1249203702 2 h1MTNeLqcLqw   86400 129394400-605430316 -WE1iH CV-afTgyhDPc   if you extract the middle part by using   to split you get  2 h1MTNeLqcLqw   86400 129394400-605430316  then split again by -  the last part 605430316 is the user id   Here is the C  code to extract the user id from the access token        public long ParseUserIdFromAccessToken string accessToken               Contract Requires  string isNullOrEmpty accessToken                          access token               1249203702 2 h1MTNeLqcLqw   86400 129394400-605430316 -WE1iH CV-afTgyhDPc                                                                                                                                                                                             user id                      long userId   0           var accessTokenParts   accessToken Split                if  accessTokenParts Length    3                        var idPart   accessTokenParts 1               if   string IsNullOrEmpty idPart                                 var index   idPart LastIndexOf  -                    if  index  gt   0                                        string id   idPart Substring index   1                       if   string IsNullOrEmpty id                                                 return id                                                                           return null          WARNING   The structure of the access token is undocumented and may not always fit the pattern above  Use it at your own risk   Update Due to changes in Facebook  the preferred method to get userid from the encrypted access token is as follows   try       var fb   new FacebookClient accessToken       var result    IDictionary lt string  object gt  fb Get   me fields id        return  string result  id      catch  FacebookOAuthException        return null

[facebook] How to get the Facebook user id using the access token

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