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JSON to YAML Converter

Convert JSON to YAML format instantly online. Free JSON to YAML converter tool. Supports nested objects, arrays, and complex data structures.

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YAML (YAML Ain't Markup Language) was designed in 2001 as a human-friendly data serialization format, emphasizing readability over terseness. While JSON is optimized for machine parsing, YAML uses indentation and minimal punctuation to express the same structures in a form closer to natural language, making it the preferred format for configuration files written and maintained by humans.

YAML is the native configuration language for Kubernetes manifests, Docker Compose files, GitHub Actions workflows, Ansible playbooks, CircleCI pipelines, Helm charts, and AWS CloudFormation templates. It is also used for application configuration in Rails (database.yml), Spring Boot (application.yml), and many other frameworks where readability of config is a priority.

This tool converts JSON to YAML using the js-yaml library's dump() function, which produces clean, standards-compliant YAML with proper indentation, block scalar styles for multiline strings, and correct handling of data types. The output follows YAML 1.2 conventions and is compatible with all major YAML parsers.

Common Use Cases

Creating Kubernetes manifests from JSON configs

kubectl and the Kubernetes API accept both JSON and YAML, but most Kubernetes documentation and community resources use YAML. When a configuration is programmatically generated as JSON — by a Terraform module, a CI script, or a Kubernetes operator — converting it to YAML makes the resulting manifest human-readable and compatible with GitOps workflows using Flux or ArgoCD.

Writing GitHub Actions workflow files

GitHub Actions requires workflow definitions in YAML format under .github/workflows/. When prototyping an action configuration using JSON tools or generating it programmatically from a pipeline builder, converting the JSON output to YAML produces the file that gets committed to the repository for GitHub to parse and execute.

Converting API responses for Ansible playbooks

Ansible playbooks and variable files use YAML syntax. When seeding Ansible inventory variables or defaults from structured JSON data returned by a configuration management API, converting the JSON to YAML produces files that can be placed directly in the roles/defaults/ or group_vars/ directories without manual reformatting.

Authoring Helm chart values files

Helm chart values.yaml files must be YAML. When a platform team generates default values from a JSON schema definition or exports current values from a running release using helm get values --output json, converting that JSON to YAML provides the correctly formatted values file for checking into source control.

How to Use the JSON to YAML Converter

  1. Paste or type your JSON in the left panel.
  2. YAML output appears automatically as you type.
  3. Click "Copy Output" to copy the YAML to your clipboard.
  4. Use "Load Example" to see a sample JSON object.
  5. Click "Clear" to reset both panels.

What is YAML?

YAML (YAML Ain't Markup Language) is a human-readable data serialization format commonly used for configuration files. It is a superset of JSON, making this conversion straightforward and lossless.