Programming Interface Application

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== Programmatic access (API) ==

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The EBRAINS Knowledge Graph provides convenient tools and APIs for the implementation of queries into your scripts.

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**Request permission**

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To be able to access the Knowledge Graph (KG) programmatically, you require:

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1. An EBRAINS account. Register for an account here: [[https:~~/~~/ebrains.eu/register/>>https://ebrains.eu/register/]]

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1. Register and request credentials for your KG client by emailing support@ebrains.eu

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=== Query Builder ===

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The query builder allows you to make, save, and reuse complex queries without any knowledge of graph query languages.

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Go to the Query Builder: [[https:~~/~~/query.kg.ebrains.eu>>https://query.kg.ebrains.eu/#state=6a41dd5b-3cf9-4263-8a65-83d41f27677a&session_state=638c33f5-4551-4d70-8b1d-a5c900aa62d0&code=300f25d8-caac-4576-9a21-195ccc93fd31.638c33f5-4551-4d70-8b1d-a5c900aa62d0.4214dba9-b6d0-4331-9837-3e75a10cda14]]

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==== Select a category ====

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A query for the Knowledge Graph is always executed against a specific data structure (e.g. a "Dataset version"). First select the data structure for your query.

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[[image:QB1.png||alt="Step 1: Select a category" height="520" width="700"]]

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==== Select an experimental approach ====

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Similar to the facetted filters in the Knowledge Graph Search UI, we can refine our query by defining the experimental approach of our interest, for example electrophysiology.

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To ensure that all dataset versions with electrophysiology are queried, and none of the dataset versions without electrophysiology, we make this property required and we apply a filter to the label we are searching for (i.e. electrophysiology).

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[[image:QBstep2.png||alt="Step 2: Select modality" height="541" width="700"]]

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==== Select species ====

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Similarly, we can refine our query for mice only.

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[[image:QBstep3.png||alt="Step 3: Select species" height="543" width="700"]]