YAML ↔ JSON Converter
Convert between YAML and JSON format instantly — no upload required.
Supports standard YAML config-file syntax: key-value pairs, nested objects, and simple arrays. Complex YAML features (anchors, aliases, multi-line blocks) are not supported.
What are YAML and JSON?
YAML (YAML Ain't Markup Language) and JSON (JavaScript Object Notation) are both human-readable data serialisation formats. JSON is stricter and more compact, making it ideal for APIs and data interchange. YAML is more readable with less punctuation, which makes it the preferred format for configuration files in tools like Docker Compose, Kubernetes, GitHub Actions, and Ansible.
Frequently asked questions
What YAML features are supported?
The converter handles standard config-file YAML: key-value pairs, nested objects, and simple arrays. Advanced YAML features such as anchors (&), aliases (*), multi-line block scalars (| and >), and custom tags are not supported. These features are rarely used in config files and JSON has no equivalent.
Does my data leave the browser?
No. All conversion is done in JavaScript running in your browser tab. Nothing is sent to a server. This is important when converting config files that may contain API keys, passwords, or other sensitive values.
Why does YAML use indentation instead of brackets?
YAML was designed for human readability. Indentation conveys structure visually without requiring every value to be wrapped in quotes or braces. The trade-off is that inconsistent indentation is a very common source of YAML parsing errors — always use spaces, not tabs.
