> For the complete documentation index, see [llms.txt](https://docs.tonic.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tonic.ai/textual/datasets-preview-output/dataset-file-preview/file-preview-json-output.md).

# File preview for a JSON output file

For a dataset that generates JSON output, the file preview displays the original file content.

## Text files

For a text file, you can switch between Markdown and the JSON output.

<figure><img src="https://3072847115-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvOPn7KQptPWmS5iKg5P0%2Fuploads%2F6Gcl84iRY9UKT083djWF%2FDatasetJSONFilePreview_Txt.png?alt=media&amp;token=b29f3567-a2de-408c-811c-56303a05436b" alt=""><figcaption><p>File preview for a text file in a JSON output dataset</p></figcaption></figure>

## CSV and RTF files

For CSV and RTF files, you can display either Markdown, HTML, or JSON output.

<figure><img src="https://3072847115-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvOPn7KQptPWmS5iKg5P0%2Fuploads%2FVagKQkxVTLelMKvgBpof%2FDatasetJSONFilePreview_CSV.png?alt=media&amp;token=c6b33348-e839-4cfb-a0e9-65586988113d" alt=""><figcaption><p>File preview for a CSV file in JSON output dataset</p></figcaption></figure>

## PDF and image files

For a PDF or file, you can always display Markdown, HTML output, or JSON output.

If the file contains tables, then the **Tables** option displays, to allow you to view the tables specifically.

If the file contains key-value pairs, then the **Key-Values** option displays, to allow you to view the key-value pairs specifically.

<figure><img src="https://3072847115-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvOPn7KQptPWmS5iKg5P0%2Fuploads%2FyE8t0CTjs8UVcpFuPVB6%2FDatasetJSONFilePreview_PDF.png?alt=media&amp;token=b74829e1-5b88-428a-a452-7b174b20d4b8" alt=""><figcaption><p>File preview for a PDF file in a JSON output dataset</p></figcaption></figure>


---

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