YAML ↔ JSON Converter — Instant & Free
Convert between YAML and JSON formats instantly. Bidirectional conversion with syntax validation. Free online developer tool.
YAML to JSON Converter — Convert Between YAML and JSON
Convert between YAML and JSON formats instantly with full syntax validation. YAML's human-readable syntax makes it ideal for configuration files, while JSON's strict structure is the standard for APIs. This bidirectional converter bridges both formats seamlessly.
The converter parses YAML using a standards-compliant parser that handles all YAML features including multi-line strings, anchors, aliases, and complex mappings. When converting to JSON, YAML-specific features like comments and anchors are resolved into their JSON equivalents. Conversion from JSON to YAML produces clean, properly indented output.
DevOps engineers convert between Kubernetes YAML manifests and JSON for API calls. Developers switch CI/CD pipeline configs (GitHub Actions, GitLab CI) between formats. System administrators transform Ansible playbooks for programmatic manipulation. Full-stack developers convert API responses to configuration format.
When converting YAML to JSON, be aware that YAML comments are lost since JSON does not support comments. YAML anchors and aliases are expanded to their full values. When converting JSON to YAML, the output uses standard YAML indentation which you may want to adjust to match your project conventions.
Compared to command-line converters like yq or Python scripts, this browser-based tool requires no installation and provides instant visual feedback. For validating and formatting JSON specifically, see our JSON Formatter. For XML conversions, check our XML Formatter.
How the YAML/JSON Converter Works
- Paste your YAML or JSON into the input field
- Select the conversion direction: YAML to JSON or JSON to YAML
- The tool validates your input and converts instantly
- Copy the result or download as a .yaml or .json file
YAML vs JSON: When to Use Which
YAML is preferred for configuration files (Docker Compose, Kubernetes, GitHub Actions) because it is more human-readable and supports comments. JSON is the standard for APIs and data interchange because every programming language has a native JSON parser. When converting, note that YAML supports features JSON does not: comments, anchors, and multi-line strings. These will be lost when converting to JSON.
When to Use a YAML/JSON Converter
Use this converter when switching between configuration formats — for example, converting Docker Compose YAML to JSON for API calls, or transforming GitHub Actions workflow YAML into JSON for programmatic editing. It is also useful when copying configuration snippets between systems that use different formats.
Common Use Cases
- •Converting Kubernetes manifests between YAML and JSON for API calls and kubectl commands
- •Transforming Docker Compose YAML files to JSON for programmatic editing JSON Formatter & Validator — Instant Results
- •Switching CI/CD pipeline configs (GitHub Actions, GitLab CI) between formats
- •Converting Ansible playbooks to JSON for integration with automation APIs XML Formatter — Prettify & Validate Free
Expert Tips
- ✱Add comments to your YAML before converting to JSON — they serve as documentation even though they will be stripped in the JSON output
- ✱Watch for YAML's implicit type coercion: bare values like 'yes', 'no', 'on', 'off' are interpreted as booleans — quote them if you need strings
- ✱For Kubernetes work, kubectl accepts both YAML and JSON — convert to JSON when you need to pipe output to jq for filtering
Frequently Asked Questions
- JSON does not support comments, anchors (&), aliases (*), or multi-line string indicators (| and >). Comments are stripped during conversion. Anchors and aliases are expanded to their full values. Multi-line strings are converted to regular JSON strings with \n escapes.
- Yes, the converter preserves strings, numbers, booleans, null values, arrays, and objects. YAML bare values like 'true', 'false', 'null', and numeric strings are converted to their JSON equivalents. If you need a string like 'true' to remain a string, quote it in YAML.
- Multi-document YAML (using --- separators) is treated as separate documents. The converter processes the first document. For multi-document files, convert each document separately or combine them into a single YAML structure first.
What YAML features are lost when converting to JSON?▾
Will the converter preserve data types?▾
Can I convert multi-document YAML?▾
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