JSON vs XML — Key Differences and When to Use Each

A practical comparison of JSON and XML: syntax, verbosity, data types, and when each format makes sense.

Quick Comparison

Feature	JSON	XML
Syntax	Curly braces, brackets	Tags with angle brackets
Verbosity	Compact	Verbose (opening + closing tags)
Data types	Native (number, boolean, null)	Strings only (schema required for types)
Arrays	Native [] syntax	Repeated elements or wrapper tags
Attributes	Not supported	Supported (<tag attr="val">)
Comments	Not supported	Supported (<!-- comment -->)
File size	Smaller (30–50% less)	Larger
Browser parsing	JSON.parse() — built-in	DOMParser — built-in but verbose
Schema validation	JSON Schema	XSD, DTD, RelaxNG
Best for	REST APIs, web apps, configs	Enterprise systems, SOAP, document markup

When to Use JSON

Modern REST APIs and web services
JavaScript/Node.js applications
Browser localStorage and sessionStorage
Configuration files (package.json, etc.)
Mobile app data (smaller payload = faster)

When to Use XML

Enterprise integrations and SOAP web services
Document-centric formats (SVG, XHTML, Office documents)
When attributes are needed on elements
When comments in data files are required
Legacy system integrations

Key Differences — Deep Dive

Verbosity

The same data in JSON is typically 30–50% smaller than XML because JSON has no closing tags. {"name":"Alice"} vs <person><name>Alice</name></person>.

Data types

JSON has 6 native types: string, number, boolean, null, array, object. XML has only text — numbers and booleans require a schema (XSD) to be enforced.

Arrays

JSON has a clean [] array syntax. XML has no native array concept — arrays are typically represented as repeated sibling elements, which can be ambiguous.

Example — Same Data in Both Formats

JSON

{
  "person": {
    "name": "Alice",
    "age": 30,
    "active": true,
    "tags": ["dev", "admin"]
  }
}

XML

<person>
  <name>Alice</name>
  <age>30</age>
  <active>true</active>
  <tags>
    <tag>dev</tag>
    <tag>admin</tag>
  </tags>
</person>

Converting Between Formats

Need to switch between JSON and XML? Both conversions are straightforward — use the free browser-based tools below. No sign-up, no file upload to a server.

Convert JSON to XML

Paste JSON, get valid XML markup instantly

Convert XML to JSON

Parse XML documents and get structured JSON back

Convert between JSON and XML instantly

Free, browser-based, no sign-up. Your data never leaves your device.

JSON to XML XML to JSON