Free Online YAML JSON Converter

How to Use the YAML and JSON Converter

This online YAML JSON converter is built for developers, DevOps engineers, QA teams, and anyone who works with configuration files. It converts YAML to JSON and JSON to YAML for Kubernetes manifests, Docker Compose files, GitHub Actions workflows, CI/CD configuration, frontend config, backend config, API debugging payloads, and static site settings.

The conversion runs locally in your browser. Your configuration text is not uploaded to a server, which is useful when files contain secrets, service ports, database hosts, environment variables, internal API URLs, or other sensitive project details.

Supported Conversions

  • YAML to JSON: convert .yaml and .yml files into JSON for scripts, API tools, frontend code, or validation workflows.
  • JSON to YAML: convert JSON objects, API responses, and config snippets into readable YAML.
  • Auto detection: paste content and let the tool detect whether the input is YAML or JSON.
  • Formatting options: JSON supports 2-space or 4-space indentation and compact output; YAML supports indentation, line width, and key sorting.
  • File workflow: upload .json, .yaml, or .yml files, then copy or download the converted result.

Steps

  1. Paste YAML or JSON content, or upload a config file.
  2. Choose the input format, or leave it on auto detect.
  3. Choose the output format: JSON or YAML.
  4. Adjust indentation, compact output, line width, or key sorting if needed.
  5. Review the converted output, then copy or download it.

Common File Types

This tool works well for common structured config files such as package.json, tsconfig.json, docker-compose.yml, GitHub Actions workflows, Kubernetes manifests, OpenAPI snippets, ESLint config, Prettier config, application settings, and frontend or backend mock data.

YAML can express more than JSON, including anchors, aliases, multiple documents, and custom tags. Some advanced YAML features may be expanded or limited when converted to JSON. For the most predictable result, use ordinary objects, arrays, strings, numbers, booleans, and null values.

Why Developers Convert YAML and JSON

JSON is strict, easy for programs to parse, and common in APIs. YAML is easier for humans to read and maintain in configuration files. Development workflows often need both formats: YAML for deployment and documentation, JSON for scripts, tooling, validation, or API clients.

This tool keeps conversion, formatting, copying, and downloading in one page, so you can handle configuration files quickly without installing a CLI utility or sending private content to a backend service.