# Introduction

{% hint style="info" %}
Dasel V3 was released in December 2025. Please raise any issues on [GitHub](https://github.com/TomWright/dasel).
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<figure><img src="https://2201275293-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FakOWYQdnj8CDqYOe0u7y%2Fuploads%2FzFHyLopX26ZsUZMfsF5d%2Fdaselgopher.png?alt=media&#x26;token=25529b2a-2386-4169-8252-b1d28de9f5bc" alt="Dasel mascot" width="375"><figcaption></figcaption></figure>

Dasel (short for **Data-Select**) is a command-line tool and library for querying, modifying, and transforming data structures such as JSON, YAML, TOML, XML, and CSV.

It provides a consistent , powerful syntax to traverse and update data - making it useful for developers, DevOps, and data wrangling tasks.

## Features

* **Multi-format support**: JSON, YAML, TOML, XML, CSV, HCL (with more planned).
* **Unified query syntax**: Access data in any format with the same selectors.
* **Query & search**: Extract values, lists, or structures with intuitive syntax.
* **Modify in place**: Update, insert, or delete values directly in structured files.
* **Convert between formats**: Seamlessly transform data from JSON → YAML, TOML → JSON, etc.
* **Script-friendly**: Simple CLI integration for shell scripts and pipelines.
* **Library support**: Import and use in Go projects.


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# Agent Instructions: 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:

```
GET https://daseldocs.tomwright.me/getting-started/introduction.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

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.