# Guide

**Just getting started?**
Check out the [home page](/intro/) for a quick start guide.

**Want to learn more about the JSON spec?**
Check out the [parameters spec](/parameters/) to learn more about what types of parameters and validators are supported by ParamTools.

## API

[**Viewing data**](/api/viewing-data/) Working with parameter values.

[**Extend:**](/api/extend/) Write more concise JSON schemas with the extend capability.

[**Extend with Indexing:**](/api/indexing/) Index parameter values.

[**Custom Adjustment Formats and Logic**](/api/custom-adjust/) Customize the adjustment format and logic to meet your project's needs.

[**Custom types**](/api/custom-types/) Add custom types for your parameters' values, labels, and members.