📖 What is YAML to JSON?
YAML to JSON converts YAML documents into equivalent JSON structures. YAML is widely used for configuration (Kubernetes, Docker Compose, CI/CD pipelines) but APIs and programming languages often need JSON. This tool validates YAML syntax and produces clean, properly formatted JSON. Everything runs in your browser.
💡 Example
Input
name: Alice
roles:
- admin
- dev
config:
theme: dark
Output
{"name":"Alice","roles":["admin","dev"],"config":{"theme":"dark"}}
🛠️ Common Use Cases
- Converting Kubernetes YAML manifests to JSON for API calls
- Transforming Docker Compose files to JSON for programmatic processing
- Validating YAML syntax by converting to the stricter JSON format
- Preparing CI/CD config data for JSON-based tools
- Converting YAML data files to JSON for web applications
📝 YAML to JSON Type Mapping
- YAML strings → JSON strings (quoted)
- YAML integers → JSON numbers
- YAML floats → JSON numbers
- YAML booleans (
true/false/yes/no) → JSON true/false - YAML null (
~ or null) → JSON null - YAML sequences (
- item) → JSON arrays - YAML mappings → JSON objects
⚠️ Common Mistakes
- Tab indentation — YAML only allows spaces, never tabs. Tab characters cause parse errors.
- Unquoted special values —
yes, no, on, off are parsed as booleans. Quote them if they are strings. - Colon in values — values containing
: (colon + space) must be quoted to avoid being parsed as key-value pairs.
❓ Frequently Asked Questions
Does it validate YAML syntax? ▾
Yes — if the YAML is invalid, the tool shows a parse error with details. Fixing the YAML and converting again validates it.
Why does my YAML value "yes" become true? ▾
YAML 1.1 treats yes, no, on, off as booleans. Quote the value ("yes") to keep it as a string.
Can I convert multi-document YAML? ▾
Multi-document YAML (separated by ---) is converted as the first document. Split multi-document files and convert each separately.
Is my data private? ▾
Yes — all processing runs entirely in your browser. Your data is never sent to any server.
Is this tool free? ▾
Completely free — no login, no usage limits, works offline once loaded.
Yes — completely free, no login required, no usage limits.
Is my data private? ▾
Yes — all processing runs in your browser. Your data is never sent to any server.
Does it work offline? ▾
Yes — once the page is loaded, the tool works without an internet connection.