JSON ↔ YAML Converter
Convert between JSON and YAML formats. Perfect for Kubernetes configs, CI/CD pipelines, and configuration files.
About JSON ↔ YAML Conversion
- JSON (JavaScript Object Notation) — strict syntax with quoted keys, used for APIs and data exchange.
- YAML (YAML Ain't Markup Language) — human-friendly format using indentation, popular for configs (Kubernetes, Docker Compose, GitHub Actions, etc.).
- Swap button carries output to input for round-trip conversion.
- Sample data uses a Kubernetes Deployment manifest — a real-world use case for this tool.
- Everything runs in your browser — no data is sent over the network.
How to Convert JSON to YAML
Converting JSON to YAML is one of the most common tasks in modern DevOps and cloud-native development. YAML has become the standard configuration language for Kubernetes, Docker Compose, GitHub Actions, GitLab CI, Ansible, and dozens of other infrastructure tools. This free online converter transforms your JSON data into clean, properly indented YAML in milliseconds — entirely in your browser with no server-side processing.
Why Convert JSON to YAML?
While JSON is the lingua franca of APIs and data interchange, YAML offers several advantages for configuration files. YAML supports comments, which are essential for documenting infrastructure-as-code. Its indentation-based syntax is more readable for deeply nested structures like Kubernetes pod specs or Docker Compose service definitions. YAML also supports multi-line strings without escape characters, making it ideal for embedding scripts, SQL queries, or policy definitions in config files.
Many tools output JSON by default — kubectl returns JSON from API calls, Terraform state files are JSON, and most REST APIs respond with JSON. Converting this output to YAML lets you integrate it directly into your configuration management workflow. For example, you might convert a JSON API response into a Kubernetes ConfigMap, or transform a Terraform output into an Ansible variables file.
Common Use Cases
- Kubernetes manifests: Convert kubectl JSON output into YAML manifests for version control and GitOps workflows.
- Docker Compose: Transform JSON service definitions into docker-compose.yml format for multi-container applications.
- GitHub Actions: Convert workflow configurations from JSON to YAML for .github/workflows/ files.
- CI/CD pipelines: Generate YAML configs for GitLab CI, CircleCI, or Azure Pipelines from JSON templates.
- Ansible playbooks: Convert structured data into YAML format for automation playbooks and inventory files.
- API documentation: Transform OpenAPI/Swagger specs between JSON and YAML representations.
JSON vs YAML: Key Differences
JSON uses curly braces for objects, square brackets for arrays, and requires double quotes around all keys and string values. YAML uses indentation to define structure, supports bare keys and unquoted strings, and allows inline comments with the # character. YAML also supports anchors and aliases for reusing values, multi-document files separated by ---, and multiple scalar styles (literal blocks, folded blocks) for multi-line content.
This converter handles all JSON data types — strings, numbers, booleans, null, nested objects, and arrays — and produces clean YAML output with your choice of 2-space or 4-space indentation. Special characters, Unicode, and deeply nested structures are all preserved accurately.
Privacy First
This JSON to YAML converter runs entirely in your browser using client-side JavaScript. Your data never leaves your device — no API calls, no server processing, no data storage. This makes it safe to use with sensitive configuration data, API keys, credentials, and internal infrastructure definitions.