# identityserver4-migration

> Claude/Codex skill by [@duendesoftware](https://omgskills.com/library/duendesoftware/index.md) · 9 stars · Updated 2026-10-16

Migrating from IdentityServer4 to Duende IdentityServer v8. Covers NuGet package replacement, namespace changes, API surface changes, EF Core database schema migrations, .NET target framework upgrade, license configuration, signing key migration, data protection, and UI template updates.

Tags: ai-agents, claude, claude-code

## Install

```sh
git clone https://github.com/DuendeSoftware/duende-skills /tmp/duende-skills && ln -s /tmp/duende-skills/skills/identityserver4-migration ~/.claude/skills/identityserver4-migration
```

## From README

Migrating from IdentityServer4 to Duende IdentityServer Scope: IdentityServer4 only. This skill covers migrating from IdentityServer4 (v3.x and v4.x) to Duende IdentityServer. It does not cover migrating from IdentityServer3 (the older Thinktecture/IdentityServer3 NuGet package that ran on OWIN/Katana and .NET Framework). IdentityServer3 is a fundamentally different product with a different API surface, configuration model, and hosting stack. If you are on IdentityServer3, you must first port to IdentityServer4 on ASP.NET Core before using this guide. When to Use This Skill Planning a migration from IdentityServer4 to Duende IdentityServer — running the migration analysis tool Upgrading a project from IdentityServer4 (v3.x or v4.x) to Duende IdentityServer v8 Replacing IdentityServer4 NuGet packages with Duende equivalents Updating IdentityServer4. namespaces to Duende.IdentityServer.

## Links

- HTML page: https://omgskills.com/library/duendesoftware/duende-skills/skills/identityserver4-migration/
- GitHub: https://github.com/DuendeSoftware/duende-skills
- Author: [@duendesoftware](https://omgskills.com/library/duendesoftware/index.md)

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