> 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="/files/DNxfGYG6VnNAoz1yESZJ" 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="/files/7reGxj2z0t4wX9RIpwKe" 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="/files/Y7NG2fBMYSpMV5wnUfqD" alt=""><figcaption><p>File preview for a PDF file in a JSON output dataset</p></figcaption></figure>


---

# Agent Instructions
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.tonic.ai/textual/datasets-preview-output/dataset-file-preview/file-preview-json-output.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.