@loopback/docs
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Documentation for LoopBack 4
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Markdown
lang: en
title: 'API docs: repository-tests.crudconnectorfeatures.idtype'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.repository-tests.crudconnectorfeatures.idtype.html
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[Home](./index.md) > [@loopback/repository-tests](./repository-tests.md) > [CrudConnectorFeatures](./repository-tests.crudconnectorfeatures.md) > [idType](./repository-tests.crudconnectorfeatures.idtype.md)
## CrudConnectorFeatures.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';
```