> For the complete documentation index, see [llms.txt](https://docs.tablomat.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tablomat.com/learn/validation.md).

# Validation

#### Introduction

You can setup validation rules to flag any content errors within your sheets.

#### Usage

Validation rules can be configured per column in the Schema settings page. For example, if you setup the following column definition ...

<figure><img src="/files/06ULRF4nabib6Bh07Mse" alt=""><figcaption></figcaption></figure>

then any cells under the "SKU" column and containing spaces will be flagged like below ...

<figure><img src="/files/YhG92gFhbmwZpzI7RV7U" alt=""><figcaption></figcaption></figure>

Clicking the alert icon (<img src="/files/JIBXzWmSWvwr5ST17xBy" alt="" data-size="line">) will show a popup with more information on the validation error ...

<figure><img src="/files/dUsgawUng3JqX0MtSv3L" alt=""><figcaption></figcaption></figure>

This particular rule supports auto-correction so the error can be corrected automatically by clicking "Fix".

There are currently two built-in validation rules:

1. "No Spaces"; checks for and corrects spaces in input
2. "No Accents"; checks for and removes letter accents
3. "Lower Case"; checks that input is in lower case
4. "Title Case"; checks that input is in title case

#### Supported Column Types

Validation is currently limited to the following types:

1. `Text`
2. `Single Select`
3. `Rich Text (HTML)`