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Google Analytics Data API should theoretically support multi-byte characters such as Japanese without any issue. However, the “Bad Request” error you’re seeing could be due to a number of reasons. Crucially, it might not necessarily be related to the use of Japanese characters. It could be something related to the structure or syntax of your request. Check the format of your request, making sure the event name is properly encoded and escaped as necessary. You should also check your request parameters as well as the API version you are using. Also make sure you’re using the correct authentication token. A good step would be testing your request with English characters to see if the issue persists. If the problem continues, it would be advisable to reach out to Google’s support team to help diagnose the specific issue.
