JSON to YAML Converter — Convert JSON & YAML Online
Convert JSON to YAML and YAML to JSON online. Free JSON-YAML converter with validation and formatting. Client-side only — data never leaves browser.
Three steps to get started
Choose direction
Select "JSON → YAML" to convert JSON to YAML format, or "YAML → JSON" to convert a YAML config to JSON.
Paste your data
Paste your JSON or YAML into the input area. If the input is invalid, an error message will explain the problem.
Copy the result
Copy the converted output for use in your project, config file, or API.
JSON and YAML: the two languages of configuration
JSON and YAML have become the dominant formats for structured data in modern software. JSON is the language of APIs, databases, and data interchange. YAML is the language of configuration — Kubernetes, Docker Compose, GitHub Actions, Helm charts, and countless other DevOps tools use it as their primary format.
The need to convert between them arises constantly: copying an API response into a config file, transforming a Kubernetes manifest into a Terraform resource, or simply making a JSON configuration more readable by converting it to YAML.
Syntax comparison
The same data in both formats:
JSON: YAML:
{"name":"Alice","age":30} name: Alice
age: 30YAML eliminates the quotation marks around keys, the curly braces, and produces one item per line — significantly more readable for humans, but requiring careful attention to indentation.
All conversion is done in your browser using the js-yaml library. No data ever leaves your browser.