Cost and Validity of Gmail API for .NET Projects

Hey everyone,

I’m working on a .NET project that uses the Gmail API. I’ve got it set up with a client_secret.json file, but I’m not sure about a few things:

  1. Is there any cost involved in using the Gmail API this way? Or is it completely free?

  2. Does the client_secret.json file have an expiration date? If so, how often do I need to update it?

I’m new to using APIs in my projects, so any info would be super helpful. Thanks in advance for your insights!

I’ve been working with the Gmail API in .NET for a couple of projects, and I can add some practical insights to what’s been said.

The API is indeed free for most use cases, but there’s a catch. Google has usage quotas, and if you exceed them, you might face temporary blocks or need to request an increase. I hit this once when I was batch processing emails, so keep an eye on your usage.

About the client_secret.json, it’s pretty stable. I’ve been using the same one for about 18 months now. However, I’d recommend rotating it annually as a best practice for security.

One thing to watch out for is rate limiting. If you’re making a lot of requests in a short time, you might get throttled. I implemented exponential backoff in my code to handle this, which really helped smooth things out.

Lastly, make sure you’re compliant with Google’s terms of service, especially if you’re handling user data. They can be pretty strict about that.

hey oscar, i’ve used gmail api in .NET too. it’s free for most stuff, so don’t worry bout costs. the client_secret.json doesn’t expire, but keep it safe! just remember to refresh user tokens regularly. good luck with ur project!

I’ve been using the Gmail API in a few .NET projects for a while now, and I can share some insights.

As far as cost goes, it’s free for most use cases. Google provides a generous quota for API calls, which is typically more than enough for small to medium-sized projects. You only start incurring costs if you’re doing something really intensive.

Regarding the client_secret.json, it doesn’t expire on its own. However, it’s tied to your Google Cloud project, so if you make significant changes there, you might need to generate a new one. That said, I’ve been using the same file for over a year without issues.

Just keep in mind that while the client secret doesn’t expire, user access tokens do. Make sure your code handles token refresh properly. Hope this helps with your project!