Zoom Meeting SDK Signature Creation

I am Creating Signature From my Java Spring Boot Application but one in a 10-20 times it says Signature is Invalid rest of the times it works fine. Don’t Know the Reason.

Browser Console Error
tp-errors.handler.ts:31 Error intercepted Error: Uncaught (in promise): Object: {“type”:“JOIN_MEETING_FAILED”,“reason”:“Signature is invalid.”,“errorCode”:3712}
at resolvePromise (zone.js:1211:1)
at resolvePromise (zone.js:1165:1)
at zone.js:1118:1
at zone.js:1134:1
at asyncGeneratorStep (asyncToGenerator.js:11:1)
at _throw (asyncToGenerator.js:29:1)
at _ZoneDelegate.invoke (zone.js:372:1)
at Object.onInvoke (core.mjs:25608:33)
at _ZoneDelegate.invoke (zone.js:371:1)
at Zone.run (zone.js:134:1)

Which Web Meeting SDK version?

Meeting SDK Signature Generation Code Snippet

 public String getZoomSignature() {
    String sdkKey  = "**********";
    String sdkSecret ="*********";
    if (sdkKey == null || sdkSecret == null) {
      return null;
    } else {
      long iat = Math.round(new Date().getTime() / (float) 1000) - 30;
      long exp = iat + 60 * 60 * 2;

      JSONObject header = new JSONObject();
      header.put("alg", "HS256");
      header.put("typ", "JWT");

      JSONObject payload = new JSONObject();
      payload.put("sdkKey", sdkKey);
      payload.put("mn", id);
      payload.put("role", 0);
      payload.put("iat", iat);
      payload.put("exp", exp);
      payload.put("appKey", sdkKey);
      payload.put("tokenExp", exp);

      final String base64Payload = encode(payload.toString().getBytes(StandardCharsets.UTF_8));
      final String base64header = encode(header.toString().getBytes(StandardCharsets.UTF_8));
      final String signature = hmacSha256(base64header + "." + base64Payload, sdkSecret);

      return base64header + "." + base64Payload + "." + signature;

  public String hmacSha256(String data, String secret) {
    try {
      byte[] hash = secret.getBytes(StandardCharsets.UTF_8);
      Mac sha256Hmac = Mac.getInstance("HmacSHA256");
      SecretKeySpec secretKey = new SecretKeySpec(hash, "HmacSHA256");
      byte[] signedBytes = sha256Hmac.doFinal(data.getBytes(StandardCharsets.UTF_8));
      return encode(signedBytes);
    } catch (NoSuchAlgorithmException | InvalidKeyException ex) {
      LOGGER.debug("Error in Zoom Signature Creation \n" + ex.getMessage());
    return null;

  public String encode(byte[] bytes) {
    return Base64.getUrlEncoder().withoutPadding().encodeToString(bytes);

Device (please complete the following information):

  • Device: [Macbook Pro, windows]
  • OS: [e.g. macOS Ventura, windows 11]
  • Browser: [e.g. Chrome]
  • Browser Version [e.g. 88.0.4324.150 (Official Build) (x86_64)]

Hi @ritesh.kumar ,

Sounds like it could be this:

Please read through that thread and let me know if you’re able to adjust and fix the issue!