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lang: en
title: 'API docs: repository-tests.crudfeatures.idtype'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/repository-tests
permalink: /doc/en/lb4/apidocs.repository-tests.crudfeatures.idtype.html
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
[Home](./index.md) > [@loopback/repository-tests](./repository-tests.md) > [CrudFeatures](./repository-tests.crudfeatures.md) > [idType](./repository-tests.crudfeatures.idtype.md)
## CrudFeatures.idType property
What type is used for auto-generated primary keys? - SQL databases typically use auto-incremented numbers, - NoSQL databases tend to use GUID/UUID strings.
Default: `'string'`<!-- -->.
<b>Signature:</b>
```typescript
idType: 'string' | 'number';
```