create facebook appsecret proof in NodeJS

fb-app-secret-proof.js

const crypto = require('crypto');

let accessToken = 'your fb accesstoken' || 'facebookClientId' + '|' + 'facebookClientSecret'
let clientSecret = 'your fb client secret'

let appsecret_proof: crypto.createHmac('sha256', clientSecret).update(accessToken).digest('hex')

@jyotman it's not working for me. What about you?

I created a Gist for this as well. fb_appsecret_proof.js. @mfressdorf and @peterpeterparker's code works, maybe my take will help others. When I reference accessToken in my Gist, keep in mind, this is the access token used when making Graph API calls for your Facebook App on behalf of the user using the App so, it would typically be the long term access token that you generated.