> For the complete documentation index, see [llms.txt](https://docs.defguard.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.defguard.net/2.1/for-developers/rest-api/core/oauth2/create-an-oauth2-openid-client-application.md).

# Create an OAuth2/OpenID client application

```json
{"openapi":"3.1.0","info":{"title":"defguard Core API","version":"2.1.0"},"tags":[{"name":"OAuth2","description":"defguard acting as an OAuth2 / OpenID Connect provider for other applications."}],"security":[{"cookie":[]},{"api_token":[]}],"components":{"securitySchemes":{"cookie":{"type":"apiKey","in":"cookie","name":"defguard_session"},"api_token":{"type":"http","scheme":"bearer"}},"schemas":{"NewOpenIDClient":{"type":"object","required":["name","redirect_uri","scope","enabled"],"properties":{"enabled":{"type":"boolean"},"name":{"type":"string"},"redirect_uri":{"type":"array","items":{"type":"string"}},"scope":{"type":"array","items":{"type":"string"}}}},"ApiErrorResponse":{"type":"object","description":"Body returned with error responses.","required":["msg"],"properties":{"code":{"type":["string","null"],"description":"Machine-readable error code, returned for selected errors."},"msg":{"type":"string","description":"Human-readable error message."}}}}},"paths":{"/api/v1/oauth/":{"post":{"tags":["OAuth2"],"summary":"Create an OAuth2/OpenID client application","operationId":"add_openid_client","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/NewOpenIDClient"}}},"required":true},"responses":{"201":{"description":"OAuth2 client created.","content":{"application/json":{"schema":{"type":"object"}}}},"400":{"description":"Invalid OAuth2 client data.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ApiErrorResponse"}}}},"401":{"description":"Session is missing or invalid.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ApiErrorResponse"}}}},"403":{"description":"Requires admin privileges.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ApiErrorResponse"}}}},"500":{"description":"Unable to create OAuth2 client.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ApiErrorResponse"}}}}}}}}}
```