JSON ↔ YAML Converter
Convert in both directions between valid JSON and a documented basic YAML subset. The page replaces two near-duplicate routes while keeping advanced YAML limitations explicit.
Browser-localFreeNo upload required
What this tool is for
Convert in both directions between valid JSON and a documented basic YAML subset. The page replaces two near-duplicate routes while keeping advanced YAML limitations explicit.
How to use
- Choose the source format.
- Paste a small data structure and convert it.
- Inspect scalar types and validate the result with the target system before deployment.
Example
Convert a service object with a name, enabled flag, and port list, then round-trip it and compare the resulting types.
FAQ
Is this a complete YAML 1.2 parser?
No. The supported subset is deliberately stated on the page.
Should converted configuration be deployed directly?
No. Validate it with the parser and schema used by the target application.
Reproducible examples
Known inputs and expected results
Run these examples in the workspace above and compare the result with the documented output.
JSON to basic YAML
- Input
- {"name":"api","enabled":true,"ports":[80,443]}
- Options
- Choose
JSON→ YAML. - Action
- Convert and inspect scalar types.
- Expected output
- A mapping with name, enabled, and a two-item ports sequence.
- Explanation
- The converter emits a readable representation of the supported
JSONstructure.
Basic YAML to JSON
- Input
- name: api enabled: true ports: - 80 - 443
- Options
- Choose YAML →
JSON. - Action
- Convert and format.
- Expected output
- {"name":"api","enabled":true,"ports":[80,443]} as formatted
JSON. - Explanation
- Boolean and numeric scalars are converted within the documented subset.
Error or unsupported case
Advanced YAML feature
- Input
- defaults: &base retries: 3 service: <<: *base
- Expected error or limit
- Anchors, aliases, and merge keys are outside the supported subset.
- Safer alternative
- Use a standards-complete YAML 1.2 parser and validate the target schema.
When not to use this tool
- Kubernetes or CI manifests using advanced YAML
- Preserving comments, anchors, tags, styles, or block-scalar formatting
Algorithm and assumptions
JSON uses the standard browser parser; YAML support is a documented basic mapping/list/scalar subset, not full YAML 1.2.
Input and output
Input is JSON or basic YAML. Output is formatted text in the other format or a specific parse/unsupported-feature error.
Supported formats and behavior
JSONnesting and basic YAML root mappings or simple lists- Strings, numbers, booleans, and
null - Two-way browser-local conversion within the stated subset
Limits
- No anchors, aliases, merge keys, tags, or block scalars
- Not a Kubernetes or application-schema validator
Edge cases and common errors
- Indentation is significant
- Strings resembling booleans may need quotes
- Large
JSONintegers follow JavaScript precision
Release testing
Checks cover both directions, nested lists/maps, scalar types, invalid syntax, unsupported YAML constructs, copy, and clear.
Privacy boundary
The input and result stay in this browser session. ZZP Box does not upload or store the values entered in this tool.
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