Logging

VWO by default logs all ERROR level messages to your device console. To gain more control over VWO's logging behavior, you can use the logger parameter in the init configuration.

Logger Properties

Parameter	Type	Description
logLevel	String	Level or Type of error. Could be one of the following: DEBUG, INFO, ERROR, TRACE, WARN
logPrefix	String	The text that is prefixed to the error messages when logged. Defaults to 'VWO-SDK'.

Example 1: Set log level to control the verbosity of logs

const options: VWOInitOptions = {
	sdkKey: SDK_KEY,
	accountId: ACCOUNT_ID,
	logLevel: LogLevel.debug
};

// initialize VWO
const vwoClient = await init(options);

Example 2: Add a custom prefix to log messages for easier identification

const options: VWOInitOptions = {
	sdkKey: SDK_KEY,
	accountId: ACCOUNT_ID,
	logLevel: LogLevel.debug,
  logPrefix: "CUSTOM_LOG_PREFIX"
};

// initialize VWO
const vwoClient = await init(options);

Example 3: Logging Callback for Third-Party Integration

useEffect(() => {
  const removeLogListener = VWO.registerLogCallback((log) => {
   const now = new Date();
   const formattedDate = now.toLocaleString();
   const formattedLog = `[${formattedDate}] ${log.type} - ${log.message}`;

   // send to third party 
  });

  // Clean up the listener when the component unmounts
  return () => {
   removeLogListener();
  };
 }, []);