YAML to Properties Converter
Convert YAML config files to Java .properties key=value format and back. Flatten nested keys, handle arrays and escape sequences — 100% in-browser, free.
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What is YAML to Properties Converter?
A YAML to Properties Converter is a bidirectional tool that transforms configuration files between YAML format (used by Spring Boot, Kubernetes, CI/CD pipelines) and Java .properties format (the classic key=value flat config used by Java applications). It flattens nested YAML structures into dotted keys (server.port = 8080) and reconstructs them back, handling arrays, escape sequences, and type detection automatically.
Key Benefits
- Migrate between application.yml and application.properties without manual rewriting
- Handles deep nesting, arrays, and escape sequences automatically
- Type-aware output: booleans, numbers, and nulls detected for clean YAML
- No upload required — all conversion happens in your browser
Common Use Cases
- •Converting Spring Boot application.yml to application.properties for legacy systems
- •Migrating Java .properties configs to YAML for modern Spring Boot projects
- •Sharing config snippets between teams using different formats
- •Verifying config structure by seeing the flattened key paths
How to Use the YAML to Properties Converter
- Choose a direction: Select YAML to Properties or Properties to YAML using the tabs at the top.
- Paste your input: Paste your YAML config or .properties content into the input box, or click Load Example to try a sample.
- Click Convert: Hit the Convert button. Nested keys are flattened to dotted notation and arrays become index keys.
- Copy or download: Copy the result to your clipboard or download it as a .properties or .yaml file.
Key Features
- Bidirectional: convert YAML to .properties and .properties back to YAML
- Flattens nested objects into dotted keys (e.g. server.port = 8080)
- Handles arrays with numeric index notation (items[0], items[1])
- Full escape sequence support: \n, \t, \uXXXX, and backslashes
- Parses .properties comments (# and !), line continuations, and multiple separators (=, :, whitespace)
- Type-aware YAML output: booleans, numbers, and nulls detected automatically