As more and more web apps rely on APIs to exchange data efficiently, data format performance is one of the most important considerations. XML used to be the primary method for exchanging data, but JSON has since become the widely adopted standard. Still, it helps to understand the foundations of both JSON and XML and to know the key differences between them. Let's explore the pros and cons of each format - XML and JSON.
XML (Extensible Markup Language) was for a long time the primary choice for open data sharing, largely because few other formats were available. It is considered a multi-purpose solution for information-sharing problems. Compared to SGML (Standard Generalized Markup Language), XML was a real breakthrough - a single format capable of handling documents, images, videos, audio, and other data types. As today's digital world has come to require more flexible options, a lighter, JSON-based approach has grown in popularity. As a result, developers now often have to choose between the two most popular data formats: XML and JSON (JavaScript Object Notation). The key question for programmers is what is the difference between XML and JSON, and which format best fits their project.
What is XML?
XML is a markup language designed to store and transport data in a structured, self-descriptive way. Its purpose is reflected in its name:
Extensible. XML tags are not predefined - you define your own tags and their order, and you also have to specify how they should be displayed or processed. XML can be represented as a file on a server or as a piece of data streamed between two computer systems.
Markup. The most recognizable feature of XML, as mentioned above, is its use of tags. The elements it uses are quite similar to those in HTML, though in XML you define your own custom set of tags.
Language. XML is a meta-language, meaning it serves as the foundation for other markup languages and tools, such as MathML and XSLT.
What is JSON?
JSON, short for JavaScript Object Notation, is a lightweight data format that has become widely used in web applications for storing and exchanging information in an easy-to-access way. A JSON file is well-organized and provides a human-readable collection of data that can be accessed in a logical manner. It is also easy for machines to parse and generate, which is why JSON is known for enabling fast data transfer.
XML vs JSON
When comparing JSON and XML, the two data representation formats are fairly close in terms of openness and simplicity. In fact, there isn't a huge difference between them - developers tend to have personal preferences and can make a strong case for either format.
Both JSON and XML use Unicode for data creation, which lets generic tools manipulate the data. As a result, a wide range of developers rely on these formats to simplify information interchange. Depending on the data you need to transfer, it's worth noting that JSON is well suited for storing data like numbers, text, and simple attachments. XML, on the other hand, offers broader capabilities, letting you store virtually any data type you need. However, this flexibility can make XML harder to read, since it requires more extensibility to manage elements like images or graphs. When working with straightforward data that doesn't need that extensibility, JSON is generally more convenient to use than XML.
In terms of human readability, both XML and JSON are considered understandable and simple. That said, JSON's format is more limited, which typically makes it more readable, while it supports a smaller range of data types than XML. XML, meanwhile, allows you to attach files of virtually any format.
Ultimately, choosing between these two formats often comes down to the programmer's preference. There are strong reasons to use JSON, but there are equally strong reasons for using XML. The right choice depends on the data being shared, the intended consumer of that data, and similar factors. The API2Cart Dev Team gives programmers the flexibility to choose whichever format suits them best, aiming to meet a wide range of needs and requirements. For example, if you mostly work with XML, you can select the XML format for data presentation. Likewise, if you prefer JSON, simply add .json to the browser line and you'll get all the necessary data in JSON format. If you have any questions, feel free to contact our Support Manager.
