Node.js

Get a JWS Protected Header

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.GetProtectedH, which copies the decoded protected header of a signature into a JsonObject.

Background. The protected header is integrity-protected by the signature. Inspecting it (for example the alg value) is useful before deciding how to validate.

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Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    var jws = new chilkat.Jws();

    //  Load the JWS compact serialization.
    var jwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>";
    success = jws.LoadJws(jwsCompact);
    if (success == false) {
        console.log(jws.LastErrorText);
        return;
    }

    //  Copy the decoded protected header of signature 0 into a JsonObject.
    var json = new chilkat.JsonObject();
    success = jws.GetProtectedH(0,json);
    if (success == false) {
        console.log(jws.LastErrorText);
        return;
    }

    json.EmitCompact = false;
    console.log(json.Emit());

}

chilkatExample();