# DuendeArchive/IdentityModel

.NET standard helper library for claims-based identity, OAuth 2.0 and OpenID Connect.

Repository: https://github.com/DuendeArchive/IdentityModel
Canonical: https://ross.abutalabs.com/products/identitymodel
Language: C#
License: Apache-2.0
License Family: permissive
Topics: identity, identityserver, oauth2, openid-connect
Archived: true
Last push: 2024-11-12T20:34:57+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3933, "days_push": 659, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1056, forks 290 (observed 2026-08-28T04:03:24.446701+00:00)

## What it is
IdentityModel is a .NET Standard helper library for claims-based identity, OAuth 2.0, and OpenID Connect. It provides request/response object models, extension methods, and specification constants for interacting with OAuth and OIDC endpoints. Note: the project is being rebranded to Duende.IdentityModel and moved to the DuendeSoftware/foss repository.

## Use cases
- make OAuth 2.0 token requests from .NET
- interact with OpenID Connect discovery and token endpoints
- work with standard claims, scopes, and parameter names
- validate and parse identity tokens in .NET apps
- implement client credentials or authorization code flows in C#

## When to choose
- you need a lightweight .NET helper for OAuth 2.0 / OIDC protocol operations
- you are building clients against IdentityServer or any compliant OIDC provider
- you want specification constants and request/response models instead of raw HTTP calls

## When to avoid
- starting new projects - use the rebranded Duende.IdentityModel package instead
- you need a full authentication UI or user session management rather than protocol helpers
- you are not on the .NET platform

## Facets
- artifact type: library
- maturity: maintenance
- function: auth, http-client, sdk
- domain: security, apis, developer-tools
- platform: dotnet, cross-platform
- tags: oauth2, openid-connect, claims-based-identity, identityserver, csharp

## Member repositories
- DuendeArchive/IdentityModel (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:24.446701+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:58:14.545445+00:00, confidence not recorded.
  - readme: https://github.com/DuendeArchive/IdentityModel (fetched 2026-08-28T04:03:24.446701+00:00, sha bab886215a1b)
- Data as of 2026-08-30T08:39:29.467469+00:00.