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As developers, we often work with XML in APIs, configuration files, and data exchange.
And if your XML uses a DTD (Document Type Definition), validation becomes critical.
Recently, while working on a project, I ran into a frustrating issue: my XML wasn’t validating,
and the error messages weren’t helpful.
I tried several online tools, but most of them were:
- Outdated
- Slow
- Confusing
- Or required software installation
So I decided to build a simple, fast, and free online DTD Validator
that works directly in the browser.
You can try it here:
https://www.hifitoolkit.com/dtd-validator/
What is DTD Validation?
DTD defines the structure of your XML document.
It specifies:
- Allowed elements
- Element hierarchy
- Attributes
- Data structure
Validation ensures your XML follows these rules.
If it doesn’t, your application may fail.
Example XML with DTD
<!DOCTYPE note [
<!ELEMENT note (to,from,heading,body)>
<!ELEMENT to (#PCDATA)>
<!ELEMENT from (#PCDATA)>
<!ELEMENT heading (#PCDATA)>
<!ELEMENT body (#PCDATA)>
]>
<note>
<to>John</to>
<from>Admin</from>
<heading>Reminder</heading>
<body>Hello World</body>
</note>
This XML is valid.
But if you change the order or remove an element, validation will fail.
That’s where a validator helps.
Why I Built This Tool
My goals were simple:
- No installation
- Instant validation
- Clean interface
- Free access
- Beginner friendly
Features
- Instant XML validation
- Supports DTD
- Free to use
- No login required
- Works in browser
- Fast and lightweight
How to Use
-
Open the tool
https://www.hifitoolkit.com/dtd-validator/
<li>Paste your XML</li>
<li>Click Validate</li>
You’ll see the result instantly.
Who Is This Tool For?
- Frontend Developers
- Backend Developers
- XML Developers
- Students
- Beginners
Feedback Welcome
This is part of my free developer tools project.
If you have suggestions, feature requests, or feedback, I’d love to hear them.
Tool link:
https://www.hifitoolkit.com/dtd-validator/
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