XML Formatter & Validator

An XML Formatter and Validator transforms raw XML data into a readable, well-structured format. XML remains widely used in configuration files, data exchange between systems, document storage, and API responses. Raw XML without proper indentation is difficult to read because the hierarchical structure of opening and closing tags becomes obscured in a wall of text.

The formatter parses the XML document and applies consistent indentation based on the nesting depth of elements. Each level of nesting receives an additional indentation level, making the parent-child relationships between elements immediately visible. Attributes are formatted consistently, and the document structure becomes clear at a glance.

Web developers format XML before reading API responses that use XML format. Many legacy systems and enterprise APIs still use XML rather than JSON. Reading a raw XML response from a SOAP API or a REST endpoint that returns XML requires formatting to understand the data structure.

Configuration files in XML format benefit from regular formatting. Application servers, build tools, and deployment systems often use XML for configuration. A well-formatted configuration file is easier to audit, modify, and debug. Formatting also helps catch structural errors like missing closing tags or incorrect nesting.

The validator checks that the XML document is well-formed according to XML specification rules. Every opening tag must have a corresponding closing tag. Tags must be properly nested without overlapping. Attribute values must be enclosed in quotes. Special characters like ampersands and angle brackets must be properly escaped or wrapped in CDATA sections.

Document Type Definition validation checks whether the document conforms to its declared DTD schema. When an XML document references a DTD, the validator can check that all required elements are present, that elements appear in the correct order, and that attribute types match their declarations.

Tree view mode displays the XML document as an interactive, collapsible tree structure. This view makes navigating large XML documents practical because deeply nested sections can be collapsed to hide unnecessary detail. Element names, attribute values, and text content are shown in the tree nodes.

Minification strips unnecessary whitespace from the XML to produce the smallest possible representation. Minified XML is useful for transmission over networks where bandwidth is limited. The minified output removes all non-essential whitespace while preserving the document structure and content intact.