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API Design

This chapter contains generally applicable information on API design. When using Ory services, one can expect a consistent experience when interacting with REST APIs.


On REST endpoints that are explicitly labeled as such, pagination information is available through the Link HTTP header.

The Link header contains a comma-delimited list of links to the following pages (where applicable):

  • First
  • Next
  • Previous (prev)
  • Last

Pages are created based on the values of limit and offset provided in the querystring, where limit is the page size, and offset is the current item. The limit parameter always has an API specific upper bound to prevent DoS.

In most scenarios, the offset should be a multiple of the limit.


> GET hydra-admin/clients?limit=5&offset=10 HTTP/1.1
> Host: localhost:4445
> User-Agent: curl/7.64.1
> Accept: */*
< HTTP/1.1 200 OK
< Content-Type: application/json
< Link: <hydra-admin/clients?limit=5&offset=0>; rel="first",</clients?limit=5&offset=15>; rel="next",</clients?limit=5&offset=5>; rel="prev",</clients?limit=5&offset=20>; rel="last"
< X-Total-Count: 123
< Date: Mon, 22 Apr 2019 23:34:29 GMT
< Transfer-Encoding: chunked

Total Count#

You can get the total item count from the X-Total-Count HTTP Header.

Date Format#

Ory's APIs use rfc3339 as the date format:

"created_at": "2006-01-02T15:04:05Z07:00"
Last updated on by Vincent