JSON vs YAML
Differences, use cases, and when to use each
JSON and YAML are both popular data serialization formats. JSON uses braces and brackets with strict syntax, while YAML uses indentation-based structure with comments and richer type support. JSON dominates web APIs; YAML dominates DevOps configuration.
Quick Comparison
| Feature | JSON | YAML |
|---|---|---|
| Syntax | Curly braces & brackets | Indentation-based |
| Comments | Not supported | Supported (#) |
| Data Types | 6 types (string, number, bool, null, array, object) | All JSON types + date, binary, anchors |
| Readability | Moderate | High |
| Parsing Speed | Very fast | Slower |
| File Size | Larger (quotes, braces) | Smaller (no delimiters) |
When to Use Each
When to Use JSON
Use JSON for web APIs, client-server communication, and any context requiring fast parsing, strict typing, and universal compatibility. JSON is the standard for REST APIs and browser-based applications.
When to Use YAML
Use YAML for configuration files, CI/CD pipelines (GitHub Actions, GitLab CI), Kubernetes manifests, and any human-edited files where comments and readability matter.
Pros & Cons
JSON
YAML
Verdict
Use JSON for APIs and data interchange where machines are the primary consumers. Use YAML for configuration files where humans edit directly and need comments. Many projects use both: YAML for config, JSON for data.