YAML to JSON
Free YAML to JSON converter online. Convert YAML to JSON instantly with real-time validation, syntax highlighting, and one-click copy.
Features
Everything you need, nothing you don’t.
- Converts YAML to clean, formatted JSON automatically as you type
- Real-time validation with exact line number error location
- Syntax-highlighted JSON output with collapsible sections
- One-click copy JSON output to clipboard
- Fullscreen mode for working with large payloads
- Keyboard shortcuts for power users
- Works entirely in your browser - no server, no upload
- Mobile-friendly and fully keyboard accessible
Related Tools
Frequently asked questions
What is a YAML to JSON converter?
A YAML to JSON converter transforms YAML (YAML Ain't Markup Language) into JSON (JavaScript Object Notation). Both formats represent the same structured data, but JSON uses explicit braces, brackets, and quotes while YAML uses indentation and minimal punctuation.
Is my data safe?
Yes. All data is converted entirely in your browser using JavaScript. Nothing is sent to any server. Your data stays private on your device.
What is the difference between YAML and JSON?
YAML uses indentation to denote structure and omits most punctuation, making it more human-readable for configuration files. JSON uses braces, brackets, and explicit quotes, making it more predictable for APIs and data interchange. YAML is a superset of JSON - any valid JSON is also valid YAML.
When should I convert YAML to JSON?
Convert YAML to JSON when you need to pass data to an API, use it with JavaScript, or work with tools that expect strict JSON. YAML is common in config files (Kubernetes, Docker Compose, GitHub Actions) while JSON is the standard for REST APIs and data storage.
Does this handle nested objects and arrays?
Yes. The converter handles arbitrarily nested YAML mappings and sequences, including multi-line strings, anchors, aliases, and all scalar types. Nested mappings become JSON objects; sequences become JSON arrays.
What happens if my YAML is invalid?
The tool displays an error message with the line number where the syntax issue occurred. Common issues include incorrect indentation, missing colons, or unquoted special characters.
Does YAML support features that JSON does not?
Yes. YAML supports comments, anchors (&), aliases (*), multi-line strings, and custom tags - none of which have direct JSON equivalents. Comments are dropped and anchors are resolved during conversion to produce valid JSON.
Can I use this offline?
Yes. Once the page is loaded, the tool works entirely offline because all conversion logic runs in your browser. No internet connection is required.
Common Conversions
Popular ways developers use YAML to JSON conversion.
Converting YAML to JSON in Python
Install PyYAML with pip install pyyaml, then convert programmatically:
import json, yaml
with open('config.yaml') as f:
data = yaml.safe_load(f)
print(json.dumps(data, indent=2))Use yaml.safe_load() rather than yaml.load() to avoid arbitrary code execution from untrusted input. For quick conversions, paste the YAML directly into the tool above.
OpenAPI and Swagger YAML to JSON
Many API tools and validators require JSON format. Paste your OpenAPI or Swagger YAML specification above to get a JSON version compatible with Postman, Swagger UI, API validators, or any tool that requires a JSON schema definition.
Kubernetes and Helm YAML to JSON
Kubernetes manifests are written in YAML, but some tools and scripts work with JSON. Paste any Kubernetes manifest or Helm values file above to convert it to JSON for programmatic processing, debugging, or use with tools like jq.