Get Access token exception

[satheeshwaran]

I am getting the below exception

TypeError: Cannot read property 'name' of null
    at FormData._getContentDisposition (/user_code/node_modules/fb/node_modules/form-data/lib/form_data.js:226:39)
    at FormData._multiPartHeader (/user_code/node_modules/fb/node_modules/form-data/lib/form_data.js:177:33)
    at FormData.append (/user_code/node_modules/fb/node_modules/form-data/lib/form_data.js:70:21)
    at appendFormValue (/user_code/node_modules/fb/node_modules/request/request.js:323:21)
    at Request.init (/user_code/node_modules/fb/node_modules/request/request.js:334:11)
    at new Request (/user_code/node_modules/fb/node_modules/request/request.js:128:8)
    at request (/user_code/node_modules/fb/node_modules/request/index.js:53:10)
    at Facebook.value (/user_code/node_modules/fb/lib/fb.js:479:26)
    at Facebook.value (/user_code/node_modules/fb/lib/fb.js:399:22)
    at Facebook.api (/user_code/node_modules/fb/lib/fb.js:276:16)

on doing this,

FB.api('oauth/access_token', {
    client_id: 'app_id',
    client_secret: 'app_secret',
    grant_type: 'client_credentials'
}, function (res) {
    if(!res || res.error) {
        console.log(!res ? 'error occurred' : res.error);
        return;
    }
 
    var accessToken = res.access_token;
});

[dantman]

Strangely the stack trace seems to suggest that the library is trying to send the params using form-data rather than www-form-urlencoded. Which suggests two problems, but which the code sample you provide doesn't actually support.

Firstly, your code sample is not a post, unless you are doing a post none of form data calls in that stack should be getting called.

Secondly, unless you're using upload objects the data should not be getting passed as formData.

Could you first check to make sure that none of the variables you're passing in are null.