Why is OAuth2 still considered difficult to implement correctly in 2025?

## The Lingering Complexity of OAuth2 in 2025 Okay, so you're probably thinking oauth2 is like, *the* standard by now, right? Well, yeah, kinda. But if you're anything like me, you've probably also felt like you're wrestling an octopus every time you gotta implement it. It's 2025, and we're still dealing with this? Here's why OAuth2 still feels like a pain: - **The OAuth2 Standard: A Maze of RFCs**. - seriously, the sheer number of RFCs (Request for Comments) that make up the OAuth2 standard is kinda mind-boggling. The OAuth 2.0's official site lists like, 17 different RFCs, and that's just to define how it *works*. … - seriously, the sheer number of RFCs (Request for Comments) that make up the OAuth2 standard is kinda mind-boggling. The OAuth 2.0's official site lists like, 17 different RFCs, and that's just to define how it - **Evolution of OAuth2 and the Proliferation of Grant Types**. - speaking of grant types, there's a bunch. authorization code, client credentials, device code, implicit (though, please don't use that one), and more. each one is meant for a specific scenario, but figuring out *which* one to use*when* can be tricky. … . - the problem is, a lot of api providers just, like, ignore this list Nango said. - then there's the parameters. oh god, the parameters. there are like, 72 official oauth parameters with a defined meaning. examples include So, how does this play out in reality? Well, imagine you're building a healthcare application that needs to access patient data from different electronic health record (ehr) systems. Each ehr system might implement OAuth2 slightly differently. One might require a specific audience parameter, while another might use a non-standard parameter for offline access. It's a mess. … All this complexity adds up. It means more development time, more debugging, and more potential security vulnerabilities. It's frustrating for developers, and it can lead to a poor user experience. So, yeah, OAuth2 is still hard in 2025. And while there's no easy fix, understanding the sources of complexity is the first step towards making it a little less painful. … parameter. Instead, they use “capabilities,” which you gotta set when you register the app. It's like they're trying to be different just for the heck of it. It's like everyone read the same book, but wrote their own ending. And you, the developer, are stuck trying to figure out which ending applies to *this* particular integration. … , except for a few, such as Notion, which prefer to get it as JSON. - Then there's the **authentication** requirement for the token request itself. Basic Auth? No auth? Who knows! It's like a surprise every time. - These variations makes your client implementation way more complicated. You can't just write one OAuth2 client and call it a day; you need to write *many* clients, each tailored to the specific quirks of each API. … error is a generic indicator that something is wrong with the parameters or format of your OAuth2 request. It's a catch-all for various issues, making debugging a real pain. - One common culprit is **incorrect scopes**. You might be asking for permissions that the user hasn't granted or that the api provider doesn't support. Double-check your scope requests against the api documentation – it's tedious, but necessary. … - One common culprit is - **The Rise of Expiring Access Tokens and Refresh Token Management** Short-lived access tokens are a good thing! They limit the window of opportunity for attackers if a token is compromised. But this means you need to handle refresh tokens properly. - **Race conditions** are a big concern. If multiple requests try to refresh the access token simultaneously, you could end up with multiple valid refresh tokens or, worse, a revoked refresh token. Implementing a locking mechanism or queueing refresh requests can help prevent this. … ## Impact on User Experience and Customer Identity OAuth2 *should* make things easier for users, but let's be real, sometimes it feels like it's actually making things harder, right? It's a tricky balance. Overly strict security can seriously mess with the user experience. Think about it: endless redirects, confusing permission requests, and constant re-authentication? It's enough to make anyone abandon an app, no matter how cool it is. … - Using OAuth2 for customer authentication and authorization has its ups and downs. On the plus side, it can simplify the login process and improve security by delegating authentication to trusted providers. On the other hand, it can add complexity to your system and create dependencies on third-party services. - The problem is, a lot of api providers just, like, ignore the official list of oauth parameters, as Nango said.