YAML ↔ JSON Converter 🔄
Convert between YAML and JSON instantly. Validates syntax and formats output offline.
YAML vs JSON: What's the Difference?
Both YAML (YAML Ain't Markup Language) and JSON (JavaScript Object Notation) are widely used data serialization formats. While they serve a similar purpose—structuring data so it can be exchanged between systems—their design philosophies differ.
- JSON is optimized for machines. It is strict, relies heavily on braces
{}and brackets[], requires quotes around keys, and does not allow comments. This makes it incredibly fast to parse. - YAML is optimized for human readability. It uses indentation (spaces) to define structure instead of brackets, allows comments, and doesn't require quotes for most strings. It's heavily used in configuration files like Docker Compose, Kubernetes manifests, and CI/CD pipelines.
Why Convert Between YAML and JSON?
Because JSON is easily parsed by web browsers and most programming languages, it is the standard for APIs and data exchange. However, JSON is notoriously difficult for humans to write manually due to its strict syntax. YAML is much easier to write and read.
Converting YAML to JSON is incredibly common when a human-written configuration file needs to be ingested by an application. Conversely, converting JSON to YAML is useful when you want to take a raw API response and make it readable or editable by a human.
YAML Syntax Rules & Common Errors
When converting YAML to JSON, syntax errors usually stem from indentation issues. Here are the main rules to remember:
| Rule | YAML Example | JSON Equivalent |
|---|---|---|
| Indentation (Use spaces, not tabs) | user: |
{"user": {"name": "Gab"}} |
| Lists/Arrays (Use hyphens) | colors: |
{"colors": ["red", "blue"]} |
| Comments (Ignored in JSON) | port: 8080 # App port |
{"port": 8080} |
| Booleans & Nulls | active: true |
{"active": true, "data": null} |