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zitadel/apps/docs/content/guides/integrate/token-introspection/index.mdx
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d8ea041c56 docs: introduce versioned docs and migrate to fuma (#11166)
## Todos for release

- [x] Configure Env in docs project on vercel
- [x] Configure Root Path in the docs project on vercel
- [ ] Remove old CSP https://github.com/zitadel/website/pull/1592

## What we did

This pull request migrates the project documentation from the old
`docs/` directory to the new `apps/docs/` directory, introduces a new
documentation system built with Next.js and Fumadocs, and updates all
relevant references, configuration files, and documentation to reflect
this change. It also adds new configuration and ignore files for the new
documentation app, updates CI and linting to exclude the new docs from
certain checks, and revises the contributing guidelines accordingly.

**Documentation System Migration and New Docs App**

* Migrated all documentation from `docs/` to `apps/docs/`, and updated
all references in `README.md`, `CONTRIBUTING.md`, and other files to
point to the new location.
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* Added a new Next.js/Fumadocs-based documentation app under
`apps/docs/`, including core app files, layouts, routing, search API,
and a comprehensive `README.md` with development and contribution
instructions.
[[1]](diffhunk://#diff-5a1b07344a2c1b4d3f37b23ff1388b62cd9f57dea3c1cd23d8a0412b7602b132R1-R74)
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[apps/docs/app/[[...slug]]/layout.tsxR1-R81](diffhunk://#diff-59e08acde4e805b7aeccef1dcf98f1d71dfc550777e6b9402085cee0e9fa4e0aR1-R81),
[apps/docs/app/[[...slug]]/page.tsxR1-R79](diffhunk://#diff-e5df3f80d0fa01e12d63d81f29c57a9d14e846c78fd3beabb2ef768e38fd9580R1-R79),
[[4]](diffhunk://#diff-389b34918e040cacaa87cd7201ffa462cc2b0b716736f537e3d3c660ac69353bR1-R7)
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[[6]](diffhunk://#diff-c8fb8339570a5305809be7c618e14705fd86390dc278e6ce8ba224a7bc8b0c3cR1-R25)

**Configuration and Tooling Updates**

* Updated `.github/workflows/codeql.yml`, `.golangci.yaml`, and
`.github/dependabot.yml` to properly handle the new docs app: excluded
`apps/docs` from certain checks, added npm dependency updates for the
docs app, and excluded generated content.
[[1]](diffhunk://#diff-12783128521e452af0cfac94b99b8d250413c516ec71fe6d97dbea666ff7ba27L8-R14)
[[2]](diffhunk://#diff-9917ddc9f1c3304218f7269265b746d997c5c0615478177b5fceecd33ef47cb5R5-R6)
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[[4]](diffhunk://#diff-dd4fbda47e51f1e35defb9275a9cd9c212ecde0b870cba89ddaaae65c5f3cd28R89-R106)
* Updated `.devcontainer/devcontainer.json` to use the latest Go 1.25.3
version for consistency.

**Licensing and Miscellaneous**

* Added `apps/docs/` to the list of licensed directories in
`LICENSING.md`.

These changes ensure the documentation is now maintained in a modern,
scalable system and all project tooling is updated to support the new
structure.

---------

Co-authored-by: Federico Coppede <[email protected]>
2026-01-29 08:38:36 -08:00

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---
title: Token introspection
sidebar_label: Token introspection
---
import DocCardList from '@/components/docusaurus/doc-card-list';
Token introspection is the process of checking whether an access token is valid and can be used to access protected resources.
You have an API that acts as an OAuth resource server and can be accessed by user-facing applications.
To validate an access token by calling the ZITADEL introspection API, you can use the JSON Web Token (JWT) Profile (recommended) or Basic Authentication for token introspection.
It's crucial to understand that the API is entirely separate from the front end.
The API shouldn’t concern itself with the token type received.
Instead, it's about how the API chooses to call the introspection endpoint, either through JWT Profile or Basic Authentication.
Many APIs assume they might receive a JWT and attempt to verify it based on signature or expiration.
However, with ZITADEL, you can send either a JWT or an opaque Bearer token from the client end to the API.
This flexibility is one of ZITADEL's standout features.
## API application
If you have an API that behaves as an OAuth resource server that can be accessed by user-facing applications and need to validate an access token by calling the ZITADEL introspection API, you can use the following methods to register these APIs in ZITADEL:
- [JSON Web Token (JWT) Profile (Recommended)](/guides/integrate/token-introspection/private-key-jwt)
- [Basic Authentication](/guides/integrate/token-introspection/basic-auth)
## Service users
If there are client APIs or systems that need to access other protected APIs, these APIs or systems must be declared as [service users](/guides/manage/console/users-overview).
A service user is not considered an application type in ZITADEL.
Read the introduction on how to [authenticate service users](/guides/integrate/service-users/authenticate-service-users).
## Further references
- [Introspection API reference](/apis/openidoauth/endpoints#token-endpoint)
- [JWT vs. opaque tokens](/concepts/knowledge/opaque-tokens)
- [Python examples for securing an API and invoking it as a service user](https://github.com/zitadel/examples-api-access-and-token-introspection)
<DocCardList />