JSON / YAML Converter
Convert between JSON and YAML formats instantly. Supports nested objects, arrays, multi-line strings, and comments. Everything runs in your browser — no data leaves your device.
About JSON and YAML
JSON (JavaScript Object Notation) and YAML (YAML Ain't Markup Language) are two of the most widely used data serialization formats in modern software development. JSON is the de facto standard for web APIs and data interchange, valued for its strict syntax and universal parser support. YAML, on the other hand, emphasizes human readability with its indentation-based structure and is the format of choice for configuration files in tools like Kubernetes, Docker Compose, Ansible, and GitHub Actions.
When to Use Each Format
JSON excels in machine-to-machine communication — REST APIs, browser storage, and data pipelines — thanks to its unambiguous syntax and native JavaScript support. YAML shines wherever humans need to read or write structured data by hand: CI/CD pipelines, infrastructure-as-code manifests, and application configuration. Many projects use both: YAML for authored config files and JSON for generated or transmitted data.
Key Syntax Differences
JSON uses braces {} for objects and brackets [] for arrays, requires double-quoted keys, and disallows comments. YAML uses indentation to denote nesting, supports comments with #, and allows unquoted strings, flow-style collections, multi-line scalars (| for literal blocks, > for folded blocks), and more. While YAML is a superset of JSON — meaning valid JSON is also valid YAML — converting between the two often improves readability or compatibility depending on the target system.
This converter handles nested objects and arrays, strings with special characters (auto-quoted), numbers, booleans, null values, and YAML comments. It runs entirely in your browser with no server round-trips, so your data stays private.