XML to Kotlin Converter
XML Input
Kotlin Output
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Lines: 35
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Open tool →In modern Android and Kotlin Multiplatform development, working with XML data has become increasingly common. Whether you're developing applications that interact with legacy systems, processing configuration files, or integrating with XML-based APIs, converting XML to Kotlin data classes can significantly improve your development workflow. This comprehensive guide explores the XML to Kotlin conversion process and how our free online conversion tool can help streamline your development.
Kotlin has emerged as a preferred language for Android and cross-platform development. When working with XML data sources, properly typed data classes provide numerous benefits:
Kotlin data classes serve as type-safe representations of XML structures. By converting XML to Kotlin, you can:
// XML representation
<user>
<id>1001</id>
Proper Kotlin data classes dramatically enhance the development experience:
With proper data classes and annotations, XML processing becomes straightforward:
Developers frequently need to convert XML to Kotlin in these scenarios:
Many Android applications need to interact with XML data, particularly when:
// XML response from a SOAP API
<response>
<status>success</status>
<user>
<id>1002</id>
<name>Jane Smith</name>
<email>jane@example.com</email>
</user>
<articles>
<article>
<id>101</id>
<title>First Article</title>
<content>Content goes here...</content>
</article>
<article>
<id>102</id>
<title>Second Article</title>
<content>More content here...</content>
</article>
</articles>
</response>
// Generated Kotlin data classes
@Serializable
data class Response(
val status: String,
val user: User,
val articles: Articles
)
@Serializable
data class User(
val id: Int,
val name: String,
val email: String
)
@Serializable
data class Articles(
val article: List<Article>
)
@Serializable
data class Article(
val id: Int,
val title: String,
val content: String
)Enterprise systems often use XML for data interchange. Converting to Kotlin ensures type safety:
// Enterprise XML configuration
<configuration>
<server>
<host>production.example.com</host>
<port>8443</port>
<useSSL>true</useSSL>
</server>
<connections>
<maxConnections>100</maxConnections>
<timeout>30000</timeout>
<retryEnabled>true</retryEnabled>
</connections>
</configuration>
// Kotlin representation
@Serializable
data class Configuration(
val server: Server,
val connections: Connections
)
@Serializable
data class Server(
val host: String,
val port: Int,
val useSSL: Boolean
)
@Serializable
data class Connections(
val maxConnections: Int,
val timeout: Int,
val retryEnabled: Boolean
)In Kotlin Multiplatform projects, consistent data models are essential:
// Using data classes in Kotlin Multiplatform
@Serializable
data class Product(
val id: String,
val name: String,
val price: Double,
val category: String,
val inStock: Boolean
) {
// Shared business logic works across platforms
fun isOnSale(): Boolean {
return price < 50.0 && inStock
}
fun displayName(): String {
return "$name (${category.toUpperCase()})"
}
}Our free online tool simplifies the conversion process through these steps:
@Serializable, @SerialName), Jackson (@JsonProperty) or no annotations in OptionsOur tool goes beyond basic conversion to provide these powerful features:
valuens: are removed and xmlns declarations are skippedList<T> everywhere at that position= null defaultisbn-13 are renamed and keep the XML name in @SerialName.kt fileThis is the exact output for a small library feed. The first book has two authors, so author is a List<String> for both books, and isbn-13 appears in only one book, so it is nullable:
<library name="City Library">
<book id="1" available="true">
<title>Kotlin in Action</title>
<author>Dmitry Jemerov</author>
<author>Svetlana Isakova</author>
<price currency="USD">39.95</price>
</book>
<book id="2" available="false">
<title>Atomic Kotlin</title>
<author>Bruce Eckel</author>
<price currency="USD">44.99</price>
<isbn-13>9780981872551</isbn-13>
</book>
</library>@Serializable
data class Library (
val book: List<Book>,
val name: String
)
@Serializable
data class Book (
val
Follow these best practices to get the most from your Kotlin data classes:
Choose meaningful names that reflect the data's purpose:
// Too generic
data class Data(
// ...
)
// More descriptive
data class UserProfile(
// ...
)When XML elements might not always be present, use nullable types:
@Serializable
data class UserProfile(
val id: Int,
val name: String,
val email: String,
val phone: String? = null, // Optional element
val address: Address? = null // Optional nested element
)
@Serializable
data class Address(
val street: String,
val city: String,
val zipCode: String
)Choose the right XML serialization library for your needs:
// Using kotlinx.serialization with xmlutil
import kotlinx.serialization.*
import nl.adaptivity.xmlutil.serialization.*
@Serializable
@XmlSerialName("user", "", "")
data class User(
@XmlElement(true) val id: Int,
@XmlElement(true) val name: String,
@XmlElement(true) val email: String
)
// Using SimpleXML (for Android)
import org.simpleframework.xml.*
@Root(name = "user")
data class User(
@field:Element(name = "id")
val id: Int,
@field:Element(name = "name")
val name: String,
@field:Element(name = "email")
val email: String
)Open Options to pick kotlinx.serialization (@Serializable with @SerialName, the default), Jackson (@JsonProperty) or plain data classes without annotations. You can also set the package name and the root class name, which defaults to the root element name.
Attributes become properties next to the child elements, so <price currency="USD">9.99</price> becomes data class Price(val value: Double, val currency: String). The text of an element that also has attributes is called value. If an attribute and a child element share a name, the attribute gets an Attr suffix.
An element that appears more than once under the same parent becomes List<T>, and it is a List at that position everywhere in the document, even where your sample has one occurrence. An element that appears only once in the whole sample stays a single value.
An element or attribute that is missing from some occurrences becomes nullable with a default, for example val phone: String? = null, so decoding does not fail when it is absent. Numbers become Long or Double, true and false become Boolean, and everything else becomes String.
Namespace prefixes are removed (<ns:book> becomes book) and xmlns declarations are skipped. Names that are not valid Kotlin identifiers, such as class, fun or isbn-13, are renamed (bookClass, isbn13) and keep the original name in @SerialName or @JsonProperty.
The classes describe your data, and property names match the XML names. XML libraries need a few extra annotations: with xmlutil add @XmlElement(true) to child-element properties and @XmlValue(true) to value; with Jackson XML add @JacksonXmlText to value and turn off list wrapping (defaultUseWrapper(false)) for repeated elements.
No. Your XML is sent to our API to generate the code and is not saved. If the XML is malformed, the tool shows the line and column of the first error instead.
Converting XML to Kotlin data classes is an essential practice for building robust, type-safe applications. Our free online XML to Kotlin Converter tool streamlines this process, helping you:
Start using our XML to Kotlin Converter today to transform your development process. Whether you're working with APIs, configuration files, or enterprise systems, properly typed data classes are the foundation of reliable Kotlin applications.