API (ojapi) API (ojapi) is an open api service for automated assignments grading in programming-intensive educational trainings such as courses on data structures, algorithm design, and problem solving. It provides various (programming + human) interfaces for courseware systems and lecturers to set up programming tasks, commit solutions for automated grading, and collect instant grading reports in their desirable formats.

The cloud-based API Engine (ojapi-engine) provides efficient and reliable means for hosting programming tasks as well as grading students' solutions. The API Engine eliminates, by taking over, the risk of having to execute potentially malicious program code inside the educators' own IT infrastructures.

The client-side API Toolkit (ojapi-toolkit) offers a collection of CLI tools, API libraries (for proprietary solutions) and plugin modules (for popular CMS systems) that can be integrated into various education scenarios and (or) courseware systems. These tools considerably alleviate the burden of building an assignment grading system, or courseware, from scratch.

Getting Started API (ojapi) service is offered on an invitation basis. To sign up, you need an invitation code issued by the OpenJudge Alliance. The ojapi service utilizes Google OAuth 2.0 Service to authenticate users. The sign up process may ask for permissions to access some public information associated with your Google account such as your email address.

Invitation Code:


The API (ojapi) service is provided 'as is' and any expressed or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. In no event shall the OpenJudge Alliance and (or) its contributor(s) be liable for any direct, indirect, incidental, special, exemplary, or consequential damages (including, but not limited to, procurement of substitute goods or services; loss of use, data or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) arising in any way out of the use of this service, even if advised of the possibility of such damage.