(JavaScript) Implementing DPoP with OAuth2 Client Credentials

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This example shows how to use Chilkat v11.4.0 or later to automatically add the following headers to HTTP requests:

Authorization: DPoP <access_token>
DPoP: <new JWT signed with same key>

Note: This example requires Chilkat v11.4.0 or greater.

var success = false;

var privKey = new CkPrivateKey();

// Load your ECDSA private key.  (Keys uses with DPoP must always be ECDSA keys.  Not RSA.)
success = privKey.LoadAnyFormatFile("qa_data/pem/ecc_privKey.pem","");
if (success == false) {
    console.log(privKey.LastErrorText);
    return;
}

var tokenEndpoint = "https://demo.duendesoftware.com/connect/token";
var apiEndpoint = "https://demo.duendesoftware.com/api/dpop/test";

// Provide the details needed for Chilkat to automatically fetch the access token
// using the client_credentials OAuth2 flow.
var json = new CkJsonObject();
json.UpdateString("client_secret","secret");
json.UpdateString("client_id","m2m.dpop");
json.UpdateString("token_endpoint",tokenEndpoint);
json.UpdateString("scope","api");

var http = new CkHttp();
http.SessionLogFilename = "c:/aaworkarea/sessionLog.txt";

// Provide private key to be used with DPoP
success = http.SetDPoPKey(privKey);
if (success == false) {
    console.log(http.LastErrorText);
    return;
}

http.AuthToken = json.Emit();

// When we make the first request to an API endpoint, we don't yet have
// an OAuth2 access token.  Chilkat (internally) will use the token endpoint
// to automatically get an access token.
// Chilkat will then add the following headers to the request sent to the API endpoint:

// Authorization: DPoP <access_token>
// DPoP: <new JWT signed with same key>

// For subsequent requests using the same Chilkat HTTP object instance,
// the same access token will be used with a newly generated DPoP header for each request.
// When the access_token is expired or about to expire, Chilkat will automatically (internally)
// refresh the access token.  Your application does not need to be concerned with the 
// complexities of fetching the access token or managing the refresh, or generating
// the DPoP header for each request.

var resp = http.QuickGetStr(apiEndpoint);
if (http.LastMethodSuccess == false) {
    console.log(http.LastErrorText);
    return;
}

var statusCode = http.LastStatus;

console.log("response status code = " + statusCode);
console.log(resp);

// Here is a Session log showing the raw HTTP request(s) and response(s).
// Notice how Chilkat automatically fetched the access_token and then used it in the API request.

// ---- Sending Mon, 30 Mar 2026 20:09:44 GMT ----
// POST /connect/token HTTP/1.1
// Host: demo.duendesoftware.com
// Content-Type: application/x-www-form-urlencoded
// Content-Length: 79
// DPoP: ****
// 
// client_secret=secret&client_id=m2m.dpop&scope=api&grant_type=client_credentials
// ---- Received Mon, 30 Mar 2026 20:09:44 GMT ----
// HTTP/1.1 200 OK
// Date: Mon, 30 Mar 2026 20:09:43 GMT
// Content-Type: application/json; charset=UTF-8
// Transfer-Encoding: chunked
// Connection: keep-alive
// Server: Kestrel
// Cache-Control: no-store, no-cache, max-age=0
// Pragma: no-cache
// X-REVISION: 4f42f7e7
// 
// 374
// {"access_token":"eyJhbGciOiJSUzI1NiIsImtpZCI6IjE1OEUyRDQ1NzhFNDMyOUJBMzRGNzkxQTQ4Nzk5NzYwIiwieDV0IjoiczkyM2RnYnhWbnhoaTJSZmR1cWZyZXZIYUUwIi
// widHlwIjoiYXQrand0In0.eyJpc3MiOiJodHRwczovL2RlbW8uZHVlbmRlc29mdHdhcmUuY29tIiwibmJmIjoxNzc0OTAxMzgzLCJpYXQiOjE3NzQ5MDEzODMsImV4cCI6MTc3NDkwN
// Dk4MywiYXVkIjoiYXBpIiwiY25mIjp7ImprdCI6IlVMR2J4ZXdNOEZUNDhTd3hKeUY3YnJuMDZWMDdPZ3VpdW41d1ZzSVVENEUifSwic2NvcGUiOlsiYXBpIl0sImNsaWVudF9pZCI6
// Im0ybS5kcG9wIiwianRpIjoiQ0Q5MjBFQzQyOTRBOTA3QUUyRjMyQjlCREQzQTA3QzMifQ.bbq8tNMVtJp79Wc9xrAsE0h8oOfdxEKtGZ3qHpJX-mvSS4FVXLoO2bfpq1nhFryfbZkk
// ENfoIwSQjb_35aziq2NrnpWwQ4vDF1b9K-b7eJXPmJybm61DAP9HSE3ZI0jMrMTRFLtjwvE4WV6ZXNTwN0Pzn6teog1i09PZQkaGtlJEBjsBaN5N7OsQvtgFLD0sNkjy1JTw5LMNE7u
// 5-W32qv-XDk9KEGfoBkqyt-SR_A2wI7oZvl4OGnYyX8tUOFszlHZKy0_0V3Oc9wkHRM2JZDA_LfTqldJHR5CF5FuNiJ2hp-kioUA-i0gWxhqnVKVspJqQAN3Z95RDl9jSf-pYSg",
// "expires_in":3600,"token_type":"DPoP","scope":"api"}
// 0
// 
// 
// ---- Sending Mon, 30 Mar 2026 20:09:44 GMT ----
// GET /api/dpop/test HTTP/1.1
// Host: demo.duendesoftware.com
// Accept: */*
// Accept-Encoding: gzip
// Authorization: ****
// DPoP: ****
// 
// 
// ---- Received Mon, 30 Mar 2026 20:09:44 GMT ----
// HTTP/1.1 200 OK
// Date: Mon, 30 Mar 2026 20:09:44 GMT
// Content-Type: application/json; charset=utf-8
// Transfer-Encoding: chunked
// Connection: keep-alive
// Server: Kestrel
// X-REVISION: 4f42f7e7
// 
// 420
// [{"type":"iss","value":"https://demo.duendesoftware.com"},{"type":"nbf","value":"1774901383"},{"type":"iat","value":"1774901383"},
// {"type":"exp","value":"1774904983"},{"type":"aud","value":"api"},{"type":"cnf","value":"{\u0022jkt\u0022:\u0022ULGbxewM8FT48SwxJyF7brn06V07Oguiun5wVsIUD4E\u0022}"},
// {"type":"scope","value":"api"},{"type":"client_id","value":"m2m.dpop"},{"type":"jti","value":"CD920EC4294A907AE2F32B9BDD3A07C3"},
// {"type":"authorization_scheme","value":"DPoP"},{"type":"proof_token","value":"eyJhbGciOiJFU .... aGrGOgkRXLQ"}]
// 0
// 
//