- #Best xml tools install
- #Best xml tools free
If you are a Visual Studio user then this tool is already installed and ready for use. The validator is quick and error messages are accurate.ĭesktop XML Validation Visual Studio 2017/2019 The editor window will highlight errors in red even before the “Validate” button is pressed so if you are editing your XML in the editor window can see errors as you type. The UI is polished and validation errors are flagged in the context of the XML. Errors are displayed center justified and partially ‘below the fold’ which makes them difficult to read.Validation errors are displayed in an error box and not in the context of the error.
Supports large XML files, like config files. Allows for cut and past, file upload or link to load XML. It suffers from some UI design flaws that make it difficult to trust in the sense that it appears a bit ‘slapped together’ (and, is this site pulling my xml data into a data collection database?). The page claims that it is the best online XML validator, but this is not true (as is usually the case with these types of claims). For example, XML files with unencrypted connection strings should not be uploaded into online XML validation tools. You can’t be sure that these sites aren’t scraping your XML for this information. My big warning with online validation tools is to be careful uploading or pasting XML that has sensitive data in it, like passwords. See the W3 School pages for more info W3 Schools XML Online Validation Tools For example, the element a with attribute “name” and value “value” would appear as follows Attributes must appear in quotesĭouble quotes or single quotes are both valid, but normally double quotes are used. XML is case sensitiveĪs a strict specification, case is part of the tag name so, Only the following special characters are allowed in a tag name:Ĭolon is generally reserved for namespace names, but nevertheless, is valid in a tag name. Numbers and special characters cannot be used to start a tag name. Tag names must start with an alpha character. Tag names have strict character limits to be precise. It’s obvious to see the problem in this small example, but in large XML documents it can be more difficult to detect and resolve this issue. An element cannot contain only the start tag or end tag of another element, it must include both tags or none.Īn incorrectly nested structure might look like this: In valid XML elements are not allowed to be overlapped. The above element is self contained, because it does not enclose any data or further elements it can be closed with the shorthand notation of adding the slash to the end of the name. Closing tags have a forward slash before the name to identify them as closing tags. This element is opened by the “” tag and closed by the “” tag. All tags must be closedĪn XML element is made up of a start tag and an end tag with content in the middle. This element is the parent element of all elements in the document. It does not count as an element.Īfter the prolog, a valid document must have only one root element. The prolog is optional and must appear first in the document. 
An XML document must have 1 root elementĪn XML document will typically include the XML Prolog:
An XML document must have 1 root elementĪll of the validators in my list verify these basic XML rules. Here is a quick review of the XML Syntax Rules: The XML Syntax is like the letters of the alphabet, and the XML document structure is the language. They need to agree on what elements will appear in the document and what they mean. In order to communicate data using XML the send and receiver of the document need to understand the structure of the document. The validators I cover here verifies the XML syntax.Īn XML document also has a structure. XML has a basic set of rules know as XML syntax that applies to all XML documents. XML stands for Extensible Markup Language. 
In this post I quickly run through the XML validation rules and what a well formed XML document needs to be valid, as well as 7 tools, both desktop and online, to verify validity and how they compare. The UX is highly intuitive and a desktop editor like VSCode gives you a secure location to run verifications on XML files that contain confidential data.
Be aware that your XML config files might contain sensitive data, do not use online validation tools if this is the case.Ī Great free and secure solution is the VSCode extension: XML Language Support by Red Hat.
Online XML validators are great for checking small XML documents without having to install a desktop tool. This saves you the hassle of starting up a desktop editor and installing a plugin. If you suspect and error in your XML get a quick validation on your XML File by copying and pasting your XML document into an online tool like.
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