YAML to JSON Converter Online — Convert YAML to JSON
Convert JSON to YAML instantly — indent · quote style · flow mode · null/bool style · syntax highlight · 100% Free
app: name: CalcNation version: 3.0.0 debug: false features: - calculator - converter
Converting YAML to JSON is essential when you need to use YAML configs in JSON-based APIs, when debugging YAML by viewing it as JSON, or when migrating config formats. This converter parses YAML (including YAML with comments and anchors) and outputs clean, formatted JSON. Instant conversion, no login, runs entirely in your browser.
What is JSON to YAML Conversion?
YAML (YAML Ain't Markup Language) is a human-readable serialisation format widely used in configuration files — Docker Compose, Kubernetes, GitHub Actions, Ansible, and CI/CD pipelines. This tool converts any valid JSON to clean, formatted YAML instantly, with full control over indentation, quoting, null representation, boolean style, and flow style for compact output.
YAML vs JSON — When to Use Which
JSON is ideal for APIs and data exchange — strict syntax, universally supported. YAML is preferred for configuration files — more readable, supports comments, and allows multi-line strings. Use this converter when your tooling expects YAML input (Helm charts, k8s manifests, docker-compose.yml) but your data starts as JSON.
Frequently Asked Questions
Why would I convert YAML to JSON?
Common reasons: (1) REST APIs accept JSON, not YAML — convert your YAML config for API calls. (2) Debugging: JSON is easier to validate and diff. (3) JavaScript apps: JSON.parse() is native, YAML needs a library. (4) Cross-platform: JSON is universally supported, YAML requires specific parsers. (5) Minification: JSON can be minified, YAML cannot.
What happens to YAML comments when converting to JSON?
Comments are stripped — JSON has no comment syntax. YAML: # This is a comment name: Raj → JSON: {"name":"Raj"}. Comments are ignored by YAML parsers and don't appear in the parsed data structure, so they can't be converted. If you need documentation in JSON, add a "_comment" field: {"_comment":"config for prod","name":"Raj"}.
How are YAML anchors and aliases converted to JSON?
YAML anchors (&anchor) and aliases (*alias) are resolved during parsing. The alias is replaced with a copy of the anchor's data. Example: defaults: &defaults port: 3000 server: <<: *defaults host: localhost → JSON: {"server":{"port":3000,"host":"localhost"}}. Anchors are merged/expanded — they don't exist in JSON output.
Can I convert multi-document YAML (---) to JSON?
YAML supports multiple documents in one file separated by ---. This converter handles single-document YAML. For multi-document: split by --- first, convert each separately. Kubernetes manifests often have multiple resources in one file — convert each --- separated block individually or use yq tool: yq -o json eval-all . manifest.yaml.