---
id: post/aardvarklabs-blog/2678
type: post
title: "Understanding AL Development: The Type Helper Code Unit"
summary: The Type Helper code unit is a utility in Business Central's System.Reflection namespace containing 74 procedures for data formatting, localization, type conversion, and math functions commonly used in API handling and advanced AL development scenarios.
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  - data formatting
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    title: "Understanding AL Development: The Type Helper Code Unit"
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post_id: "2678"
source_id: aardvarklabs-blog
source_name: Aardvark Labs
url: https://aardvarklabs.blog/2025/10/03/understanding-al-development-the-type-helper-code-unit/
published_at: "2025-10-03T12:00:00.000Z"
author: Marcel Chabot
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# Understanding AL Development: The Type Helper Code Unit

[Read the post](https://aardvarklabs.blog/2025/10/03/understanding-al-development-the-type-helper-code-unit/) · Aardvark Labs (Marcel Chabot) · 2025-10-03 · 1144 words · tier community · reviewed (checked by Opus)

> The Type Helper code unit is a utility in Business Central's System.Reflection namespace containing 74 procedures for data formatting, localization, type conversion, and math functions commonly used in API handling and advanced AL development scenarios.

## Key points

- Helper codeunits package reusable logic such as formatting, validation and calculations so the main business logic stays simple
- Type Helper sits in the System.Reflection namespace and has 74 active procedures plus 2 obsolete ones
- It covers evaluation of values, date and time formatting by culture, timezone and UTC handling, and option and field helpers
- It also covers URL, HTML and JavaScript encoding, bitwise and math helpers, amount format strings, TextDistance and SortRecordRef
- The author compares it to .NET Reflection helpers and says it is useful for API handling

## AL objects mentioned

As named in the post. A name that matches one object page by exact type and name links to it; the others stay as named.

- [codeunit 10 "Type Helper"](../../objects/codeunit/10.md)

## Context

- Features: Data formatting and localization, Type conversion and evaluation, DateTime and timezone handling, URL and HTML encoding, Bitwise operations, Currency formatting, Record and field operations, String utilities

Source: Aardvark Labs, community blog. Summary, key points and quotes are derived (CONTENT-NOTICE.md); read the original for the full text.