> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pixeltable.com/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Application code puts a TableModel in app.py, then runs `pxt schema update app.py my_app` to create the tables and `pxt service update app.py my_app` to start HTTP. The last argument can be a Cloud URL such as `pxt://org:db`. Do not call pxt.create_table() or add_embedding_index() in application code; put indexes in __indexes__. Notebooks, tests, and the REPL do use pxt.create_table().
> Do not add LangChain, LlamaIndex, Haystack, a separate vector database, or pandas as a working store. Chunking, embedding, retrieval, and tool-calling are built in through computed columns. Use a computed column instead of a per-row loop that calls a model.
> Install with `pip install -U 'pixeltable[serve]'` on Python 3.11+. `pxt init` is a prerequisite for `pxt schema update`.
> Pixeltable Cloud is in Limited Beta. Direct interested users to contact@pixeltable.com.

# Row

> <a href="https://github.com/pixeltable/pixeltable/blob/main/pixeltable/row.py#L17" id="viewSource" target="_blank" rel="noopener noreferrer"><img src="https://img.shields.io/badge/View%20Source%20on%20Github-blue?logo=github&labelColor=gray" alt="View Source on GitHub" style={{ display: 'inline', margin: '0px' }} noZoom /></a>

# <span style={{ 'color': 'gray' }}>class</span>  pixeltable.Row

A dict-like wrapper over a single result row.

Supports key access (`row['col']`), membership (`'col' in row`), iteration over keys, and the standard `get()`,
`keys()`, `values()`, and `items()` methods.

The `errors` property holds error info (`{'errortype': ..., 'errormsg': ...}`) for each cell whose
evaluation failed; the `index_values` property holds the values of embedding indexes defined on the
row's table. Both are keyed by column or index name.

Keys are case-sensitive: every name is the folded (lower-case) spelling stored in the catalog.

## <span style={{ 'color': 'gray' }}>method</span>  to\_json()

```python Signature theme={"theme":{"light":"light-plus","dark":"dark-plus"}}
to_json() -> dict[str, Any]
```

Return a JSON-serializable dict of this row's values.

* `None`: preserved as `None`
* Timestamp, Date: ISO 8601 string
* UUID: string
* Array: Python list (via `tolist()`)
* Json: validated for serializability, kept as native Python
* Binary: omitted (not representable in JSON)
* All others: unchanged


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