api-docs/docs/node-tracker/markdown/node-tracker.payloadbuilder.withjsonprocessor.md
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[Home](./index.md) > [@snowplow/node-tracker](./node-tracker.md) > [PayloadBuilder](./node-tracker.payloadbuilder.md) > [withJsonProcessor](./node-tracker.payloadbuilder.withjsonprocessor.md)
## PayloadBuilder.withJsonProcessor property
Adds a function which will be executed when building the payload to process the JSON which has been added to this payload
<b>Signature:</b>
```typescript
withJsonProcessor: (jsonProcessor: JsonProcessor) => void;
```