JSON to YAML Converter

Convert between JSON and YAML formats instantly. All processing happens in your browser — no data is sent to any server.

How It Works

This tool converts between JSON and YAML entirely in your browser using JavaScript. JSON input is parsed with the native JSON.parse() method. YAML parsing and serialization uses a built-in converter that handles the core YAML specification including objects, arrays, strings, numbers, booleans, and null values.

• JSON to YAML — parses JSON and serializes it into clean, human-readable YAML with configurable indentation
• YAML to JSON — parses YAML markup and converts it to formatted JSON output
• Bidirectional — toggle the direction to convert either way with one click
• File Upload — drag and drop or browse to load .json, .yaml, or .yml files directly

About JSON and YAML

JSON and YAML are both popular data serialization formats. JSON is widely used in APIs and web applications due to its simplicity and native JavaScript support. YAML is preferred for configuration files (Docker Compose, Kubernetes, Ansible, CI/CD pipelines) because of its human-readable, whitespace-based syntax.

Key Differences

• Syntax — JSON uses braces and brackets; YAML uses indentation and dashes
• Readability — YAML is generally easier for humans to read and write
• Comments — YAML supports comments (#); JSON does not
• Data Types — both support strings, numbers, booleans, null, arrays, and objects
• Use Cases — JSON for APIs and data exchange; YAML for configuration files

When to Use Each

• JSON — REST APIs, package.json, tsconfig.json, data interchange between systems
• YAML — docker-compose.yml, .github/workflows, ansible playbooks, Kubernetes manifests