Convert YAML data into JSON format

YAML to JSON Converter — Parse Configuration Files Into Programmable JSON

YAML configuration files are authored by humans and consumed by specific tooling — Kubernetes, Ansible, Docker Compose, GitHub Actions, Helm, Terraform, and dozens of other DevOps tools each have their own YAML schemas that their parsers understand natively. But debugging these configurations, writing validation logic against their content, or passing configuration values to systems that expect JSON all require consuming the YAML programmatically through a generic JSON representation. The YAML-to-JSON converter parses YAML through a standards-compliant YAML 1.1 or 1.2 parser and outputs the equivalent JSON, making any YAML file inspectable with JSON tools, queryable with JSONPath, and importable into any application that accepts JSON input.

YAML's implicit type coercion is the primary source of bugs when YAML values are consumed by systems that did not apply the same coercion. The YAML 1.1 specification (used by PyYAML, the most common YAML library) interprets "yes", "no", "on", "off", "true", "false" as booleans and "1.0", "1e3" as floats — without quotation marks. A configuration value of "no" intended as a string (a two-letter country code, a database option value, or a directive name) is silently coerced to boolean false by YAML 1.1 parsers, causing the downstream application to receive false where it expected the string "no". YAML 1.2 (used by more recent parsers) restricts implicit boolean coercion to only "true" and "false". The converter makes the YAML version and coercion rules explicit, and flags values that would be affected by the coercion difference between versions — so type surprises surface during conversion rather than at runtime.

Multi-document YAML files — files containing multiple YAML documents separated by "---" document delimiters — are common in Kubernetes manifests where multiple resource definitions (Deployment, Service, ConfigMap) are bundled in a single file for deployment with a single kubectl apply command. These multi-document files cannot be converted to a single JSON object; they produce either a JSON array of objects (one array element per document) or multiple separate JSON files (one per document). The converter handles multi-document YAML with both output modes — array output for tools that accept a JSON array of documents, separate file output for tools that expect one document per file. The document count and delimiter positions are reported before conversion so the output structure is predictable.