React Native

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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React Native

import { JsonObject, Jws } from '@chilkat/react-native'

function chilkatExample() {
  const jws = new Jws();

  // Load the JWS compact serialization.
  const jwsCompact = 'eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>';
  try {
    jws.loadJws(jwsCompact);
  } catch {
    console.log(jws.lastErrorText);
    return;
  }

  // Copy the decoded protected header of signature 0 into a JsonObject.
  const json = new JsonObject();
  try {
    jws.getProtectedH(0, json);
  } catch {
    console.log(jws.lastErrorText);
    return;
  }

  json.emitCompact = false;
  console.log(json.emit());
}