YAML ↔ JSON Converter
Convert between YAML and JSON formats with live validation and pretty-printing.
What is YAML to JSON Converter?
A YAML to JSON converter bridges two of the most popular data serialisation formats used in modern software development. YAML (YAML Ain't Markup Language) is a human-friendly format favoured for configuration files — think Kubernetes manifests, GitHub Actions workflows, Docker Compose files, and Ansible playbooks. JSON (JavaScript Object Notation) is the lingua franca of web APIs, databases, and JavaScript-based tooling. Both formats represent the same underlying data structures: objects, arrays, strings, numbers, booleans, and nulls.
The need to convert between them comes up constantly. You might receive a JSON API response that you want to store as a YAML config, or you need to feed a YAML config file into a tool that only accepts JSON. Doing this conversion by hand is error-prone — YAML uses indentation for structure while JSON uses braces and brackets, and a misplaced space in YAML can silently change the meaning of your data.
This tool parses your input, validates it, and produces clean, correctly formatted output in the target format. Live validation highlights any syntax errors as you type — an indentation mistake in YAML or a missing comma in JSON is flagged immediately with a clear message so you can fix it on the spot.
Both directions are supported: YAML to JSON and JSON to YAML. The converter handles multi-document YAML, nested objects, arrays, anchors, and all standard YAML scalar types, making it suitable for real-world config files rather than just toy examples.
How to Use YAML to JSON Converter
- Paste your input
Paste your YAML or JSON text into the input panel. The tool auto-detects the format, or you can select it manually.
- Choose conversion direction
Select YAML to JSON or JSON to YAML using the direction toggle at the top of the tool.
- Review live output
The converted result appears instantly in the output panel. Any syntax errors are shown with a descriptive message.
- Copy or download
Copy the converted output to your clipboard or download it as a file ready to use in your project.
Key Benefits
Switch between YAML and JSON in real time — no page reloads, no waiting, just immediate results.
Errors in your input are caught and described clearly as you type, saving you from silent data corruption.
Supports nested structures, arrays, anchors, and all standard scalar types found in production config files.
Conversion runs entirely in your browser. Your configuration data, secrets, and API keys never leave your device.
Frequently Asked Questions
Mostly, but not always. YAML supports features JSON does not, such as comments, anchors, and aliases. These are lost when converting to JSON. JSON is a strict subset of YAML 1.2, so valid JSON is always valid YAML.
Comments are not part of the data model, so they are stripped when converting YAML to JSON. If you convert back to YAML, the comments will not be restored.
Multi-document YAML (documents separated by ---) is supported. Each document is converted individually, and the output is wrapped in a JSON array when converting to JSON.
YAML uses indentation to define structure — unlike JSON which uses braces. A two-space indent and a four-space indent can produce completely different data trees. Always use consistent indentation throughout your YAML file.