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DevUtil

JSON to YAML Converter - Convert JSON to YAML Online

Switch to YAML → JSON
Input JSON
YAML Output

About the JSON to YAML Converter

YAML is the standard configuration format for cloud-native infrastructure. Kubernetes, Docker Compose, GitHub Actions, and dozens of other tools expect YAML input. But much of the data developers work with starts life as JSON, returned by APIs, exported from databases, or generated by scripts. This converter turns any valid JSON document into clean, idiomatic YAML in one step.

The conversion runs entirely in your browser. There is no server involved, so sensitive configuration data such as secrets, connection strings, or internal endpoint URLs stays on your machine.

How to Use the Converter

Paste your JSON into the left-hand input editor. The equivalent YAML appears instantly in the output panel on the right. Review the output, then click the copy button to place it on your clipboard. You can then paste it directly into your Kubernetes manifest, Docker Compose file, CI pipeline, or any other YAML configuration.

Features

  • Accurate type mapping. Strings, numbers, booleans, null, objects, and arrays are all converted to their correct YAML counterparts.
  • Proper quoting. Values that YAML could misinterpret (like "true", "null", or date strings) are safely quoted.
  • Clean indentation. Output uses two-space indentation for readability, the most common convention in YAML files.
  • Nested structure support. Deeply nested JSON objects and mixed object/array hierarchies are handled correctly.
  • Client-side processing. Nothing is uploaded; conversion happens in your browser.

Common Use Cases

DevOps engineers frequently receive API responses in JSON that need to be transformed into YAML for infrastructure-as-code templates. Front-end developers converting i18n JSON files to YAML for static site generators will also find this tool handy. And when migrating configuration between systems, say from a JSON-based tool to one that expects YAML, the converter eliminates tedious manual reformatting and the errors that come with it.

Frequently Asked Questions

What is the difference between JSON and YAML?
JSON uses braces, brackets, and double quotes with a strict syntax. YAML uses indentation and minimal punctuation, making it more human-readable. Both formats represent the same data structures, namely objects (mappings) and arrays (sequences), but YAML also supports features like comments and multi-line strings that JSON does not.
Why would I convert JSON to YAML?
YAML is the preferred format for many DevOps tools including Docker Compose, Kubernetes manifests, Ansible playbooks, and GitHub Actions workflows. If your data originates as JSON (e.g., from an API), converting it to YAML lets you use it in these tools directly.
Does the conversion preserve data types?
Yes. Strings, numbers, booleans, null values, nested objects, and arrays are all mapped accurately to their YAML equivalents. The converter handles edge cases like empty objects, empty arrays, and special characters in strings.
Can I convert YAML back to JSON?
This tool converts from JSON to YAML. For the reverse direction, you can paste the YAML output into a YAML-to-JSON converter or use the JSON Formatter tool after converting with a command-line utility.
Is the output valid YAML 1.2?
Yes. The converter produces YAML 1.2 compliant output. Strings that could be misinterpreted as other types (such as 'true', 'null', or date-like values) are properly quoted to avoid ambiguity.