> For the complete documentation index, see [llms.txt](https://docs.yansalabs.com/barcode-and-qr-code-generator/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.yansalabs.com/barcode-and-qr-code-generator/technical-docs/barcode-tester.md).

# Barcode Tester

A simple barcode testing page is included to allow testing of barcode generation - it can be found under **Barcode Tester** in the left nav. This is useful to confirm correct functionality of a particular value & a particular barcode format. If there is an issue generating the desired barcode, an error message will be displayed.

{% hint style="info" %}
The barcode tester tests server-side generation of barcodes alone. If you wish to test client-side barcode generation and/or generation of complete barcode labels, we recommend using the built-in display on the **Barcode Generator** form.
{% endhint %}

<figure><img src="/files/L0Dct02jdf0RHogwctTF" alt=""><figcaption><p>Barcode Tester</p></figcaption></figure>


---

# Agent Instructions
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## 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, and the optional `goal` query parameter:

```
GET https://docs.yansalabs.com/barcode-and-qr-code-generator/technical-docs/barcode-tester.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
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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.