As the Google Forms API is a shared service, we apply quotas and limitations to make sure it's used fairly by all users and to protect the overall health of the Google Workspace system.
If you exceed a quota, you'll generally receive a
429: Too many requests
HTTP status code response. If this happens, you should use an
exponential backoff algorithm and try again
later. Provided you stay within the per-minute quotas below, there's no
limit to the number of requests you can make per day.
Note: Form watches have additional limits. See Set up and receive push notifications for more information.
The following table details the request limits:
Expensive read requests
Resolve time-based quota errors
For all time-based errors (maximum of N requests per X minutes), we recommend your code catches the exception and, using an exponential backoff algorithm, implement a small delay before trying again. If requests are still unsuccessful, it's important the delays between requests increase over time until the request is successful. Generally, you should use a truncated exponential backoff. To learn how to use exponential backoff, go to Retry strategy.
All use of the Google Forms API is available at no additional cost. Exceeding the quota request limits doesn't incur extra charges and your account is not billed.
Request a quota increase
Depending on your project's resource usage, you might want to request a quota increase. API calls by a service account are considered to be using a single account, so you might need a higher per-user, per-project quota in that scenario. Applying for an increased quota doesn't guarantee approval. Large quota increases can take longer to be approved.
Not all projects have the same quotas. As you increasingly use Google Cloud over time, your quotas might need to increase. If you expect a notable upcoming increase in usage, you can proactively request quota adjustments from the Quotas page in the Google Cloud console.
To learn more, see the following resources: