rsnext/errors/large-page-data.md
Ryan Parker 0a093c0e82
docs(errors/large-page-data): how to see data being passed to page (#40491)
## Summary

This PR adds a note about how to see the data that this error is complaining about:

```sh
Warning: data for page "/" is xxx which exceeds the threshold of 128 kB, this amount of data can reduce performance.
```

This debug trick was something I came across in a [discussion](https://github.com/vercel/next.js/discussions/39880) and I thought it would be helpful to others like it was for me.

## Documentation / Examples

- [ ] Make sure the linting passes by running `pnpm lint`
- [ ] The examples guidelines are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)


Co-authored-by: JJ Kasper <22380829+ijjk@users.noreply.github.com>
2022-09-13 00:44:43 +00:00

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Markdown

# Large Page Data
#### Why This Error Occurred
One of your pages includes a large amount of page data (>= 128kB). This can negatively impact performance since page data must be parsed by the client before the page is hydrated.
#### Possible Ways to Fix It
Reduce the amount of data returned from `getStaticProps`, `getServerSideProps`, or `getInitialProps` to only the essential data to render the page. The default threshold of 128kB can be configured in `largePageDataBytes` if absolutely necessary and the performance implications are understood.
To inspect the props passed to your page, you can inspect the below element's content in your browser devtools:
```sh
document.getElementById("__NEXT_DATA__").text
```
### Useful Links
- [Data Fetching Documentation](https://nextjs.org/docs/basic-features/data-fetching/overview)