Quick comparison
| Format | Best for | Tradeoff |
|---|---|---|
| JSON | APIs, payloads, modern web apps | Less friendly for hand-edited comments and long config files |
| YAML | Configs, CI pipelines, infra manifests | Whitespace matters, which can make mistakes subtle |
| XML | Legacy integrations, document standards, namespaces | More verbose and heavier for everyday API payloads |
When JSON is the right choice
JSON is compact, well supported in programming languages, and fits API payloads naturally. It is usually the best choice when data moves between services, browsers, and backends.
{
"user": {
"id": 42,
"name": "Ada"
}
}
When YAML is the better fit
YAML trades strict punctuation for indentation, which many teams prefer in config-heavy workflows. It reads more like a hand-written document than a machine payload.
user: id: 42 name: Ada
When XML still makes sense
XML remains useful for standards-driven ecosystems, tools that rely on namespaces or attributes, and systems that already expect document-style markup.
<user id="42"> <name>Ada</name> </user>
How to choose
- Choose JSON for application data, APIs, and straightforward machine parsing.
- Choose YAML for hand-maintained configs and readability-focused documentation.
- Choose XML when an ecosystem or schema standard already requires it.