JSON and XML are both text-based data formats used to structure and transport information. JSON dominates modern web APIs; XML remains prevalent in enterprise systems, document formats and older infrastructure. Understanding both is useful when you encounter either in an API, a configuration file or a data feed.
The Same Data in Both Formats
JSON: ``json { "student": { "name": "Farrukh", "age": 22, "subjects": ["Maths", "Physics", "CS"] } } ``
XML: ``xml <student> <name>Farrukh</name> <age>22</age> <subjects> <subject>Maths</subject> <subject>Physics</subject> <subject>CS</subject> </subjects> </student> ``
The JSON version is noticeably shorter for the same data.
Key Differences
| Feature | JSON | XML |
|---|---|---|
| Verbosity | Compact | Verbose (opening + closing tags) |
| Data types | Strings, numbers, booleans, null, arrays, objects | All values are strings by default |
| Comments | Not supported | Supported (<!-- comment -->) |
| Attributes | Not supported | Supported (<tag attr="value">) |
| Namespaces | Not supported | Supported |
| Schema validation | JSON Schema (less standardised) | XSD (well-established standard) |
| Human readability | High | Moderate |
Where Each Is Used Today
JSON is used for:
- REST APIs (GitHub, Google, Facebook, virtually all modern APIs)
- NoSQL databases (MongoDB, CouchDB)
- Configuration files (package.json, tsconfig.json)
- Frontend-backend data exchange
XML is used for:
- Office document formats (Microsoft Word .docx is a ZIP of XML files)
- SVG graphics (SVG is XML)
- SOAP web services (older enterprise APIs)
- RSS/Atom feeds
- Android resource files
- FBR/government data feeds and some banking integrations in Pakistan
Working With Both
- Format and validate JSON: JSON Formatter
- Format and validate XML: XML Formatter
Both tools take messy, unindented text and display it clearly, and show errors when the format is invalid. For JSON error fixing specifically, see how to fix invalid JSON errors.
Practical Implication in Pakistan Tech Context
Pakistani government APIs and banking integrations sometimes use XML (especially older SOAP-based systems from FBR, SBP and some telecom APIs), while newer fintech and e-commerce integrations primarily use JSON REST APIs. When integrating with a government portal or older payment gateway, checking whether they use WSDL/SOAP (XML) or REST (JSON) determines which set of tools and parsers you'll need. XML Formatter helps when reviewing SOAP responses; JSON Formatter covers REST API work.
SVG Is XML
SVG (Scalable Vector Graphics) files are XML documents. The logo you download as an .svg is readable XML, and you can open it in a text editor to see the underlying code — paths, circles, rectangles and colours defined as XML elements and attributes. This is why SVG files can be embedded directly in HTML (they become part of the DOM), styled with CSS and animated with JavaScript. XML Formatter makes SVG code readable the same way it formats any other XML.
