api-docs/docs/node-tracker/markdown/node-tracker.selfdescribingjson.md
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[Home](./index.md) > [@snowplow/node-tracker](./node-tracker.md) > [SelfDescribingJson](./node-tracker.selfdescribingjson.md)
## SelfDescribingJson type
Export interface for any Self-Describing JSON such as context or Self Describing events
<b>Signature:</b>
```typescript
type SelfDescribingJson<T extends Record<keyof T, unknown> = Record<string, unknown>> = {
schema: string;
data: T;
};
```