JSON ↔ YAML Converter
JSON ↔ YAML Converter converts YAML to JSON and JSON to YAML locally with side-by-side sync, syntax-only validation, key sorting, indent controls, multi-document YAML, and copy/download.
JSON indent
YAML indent
Sort keys
Split array into multi-doc YAML (--- separated)
JSON
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YAML
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Quick Start
Common Scenarios
Kubernetes authoring
convert K8s resource manifests between YAML and JSON to inspect structure from either view.
Helm values debugging
convert values.yaml to JSON to inspect types and nesting in your IDE.
CI/CD pipelines
quickly convert snippets between GitHub Actions (YAML) and CI systems that use JSON.
API debugging
convert JSON payloads to YAML for a clearer hierarchical view.
Configuration migration
convert one pasted config snippet at a time while checking how comments, anchors, and document separators change in JSON.
Syntax formatting and validation
verify JSON/YAML syntax via two-way sync, with line/column error location.
Usage Advice
Conversion Contract
Lossy Round Trip Boundaries
Limitations & Compatibility
Privacy & Security
FAQ
JSON and YAML can represent the same data types (objects, arrays, strings, numbers), but their syntax differs: • JSON uses braces/brackets and double quotes, has stricter syntax, and does not support comments. • YAML uses indentation for hierarchy, is more human-readable, and supports comments, but is sensitive to whitespace. Rule of thumb: • For APIs and machine-to-machine data exchange, prefer JSON. • For Kubernetes/Helm/CI configs that humans edit often, prefer YAML. • You can convert between them without changing the data model.
YAML 1.1 parsers often treat yes/no/on/off/y/n as booleans. This tool follows YAML 1.2 behavior, where true/false are the portable boolean values. Quote strings such as "yes" when a downstream legacy tool might read them differently.
JSON (RFC 8259) does not allow comments. So YAML comments cannot be preserved in YAML→ JSON conversion, and they cannot be reconstructed when converting back. Keep the original YAML file if comments matter.
--- is YAML's document separator, used to store multiple independent documents in one file. This is common in Kubernetes, where one file can contain Deployment, Service, and ConfigMap definitions. This tool reads multi-document YAML as a JSON array, and can also split a JSON array back into --- separated YAML documents.
JavaScript uses IEEE 754 double-precision numbers. Safe integers range from -(2^53-1) to 2^53-1 (±9007199254740991). Larger integers (for example, Snowflake IDs or 64-bit timestamps) may lose precision. To preserve exact values, store them as strings, such as "9007199254740992".
Anchors (&name) and aliases (*name) are YAML-specific reuse features. JSON has no equivalent reference mechanism, so aliases are expanded into full copies during conversion. This is a lossy transformation, and the original anchor structure cannot be restored automatically.