JSON vs YAML vs XML: Which Should You Use?
JSON, YAML and XML can all represent the same structured data, yet they feel very different to work with. Choosing the right one depends on whether you are exchanging data between programs, writing configuration by hand, or integrating with an older system.
JSON: the default for APIs
JSON is compact, fast to parse, and supported everywhere. It is the natural choice for data interchange between programs — almost every modern web API speaks JSON. Its main drawback for humans is that it has no comments and can become hard to read when deeply nested.
YAML: built for humans writing config
YAML is a superset of JSON that uses indentation instead of brackets and supports comments. That makes it pleasant to edit by hand, which is why tools like Docker Compose, Kubernetes, GitHub Actions and Ansible use it. The trade-off is that significant whitespace makes YAML easy to break with a stray space, and its flexible syntax has some surprising edge cases.
XML: verbose but battle-tested
XML predates both and is still common in enterprise systems, SOAP APIs and document formats. It supports attributes, namespaces and schema validation, making it powerful for complex documents — but its closing tags make it far more verbose than JSON or YAML.
Which one to pick
- Exchanging data between programs or building a web API → JSON.
- Writing configuration files that humans will edit → YAML.
- Integrating with a legacy system, SOAP service, or needing schema validation → XML.
The good news is you are never locked in. MyJson can convert JSON to YAML and JSON to XML instantly, so you can keep your source data in JSON and emit whichever format a given system needs.
Frequently asked questions
Is YAML faster than JSON?
No. JSON is generally faster to parse because its syntax is simpler and more rigid. YAML’s flexibility makes parsing more involved. YAML’s advantage is human readability, not speed.
Can I convert between these formats?
Yes. Because they all represent the same kinds of structured data, you can convert JSON to YAML or XML (and back) without losing information, using the converters on this site.