Online Properties ⇄ YAML Converter

JSON, YAML, and .properties are the three most common formats for application configuration across virtually every tech stack. REST APIs and config services use JSON, Docker Compose, Kubernetes, Ansible, and CI/CD pipelines (GitHub Actions, GitLab CI) use YAML, while Java and Gradle projects typically use .properties. These formats regularly need to cross boundaries - this tool converts instantly between all three, in any direction.

Everything runs 100% in your browser - no data is sent to any server. Safe to use with real config values.

🔁 Properties ⇄ YAML Converter

100% Client-Side Execution. No Data Sent to Server Secure

The Same Config in All Three Formats

All three formats express the same nested key-value structure - only the syntax differs. Here is a generic application config shown in each format:

.properties

app.name=my-service
app.port=8080
app.debug=false
database.host=localhost
database.port=5432
database.name=mydb

YAML

app:
  name: my-service
  port: 8080
  debug: false
database:
  host: localhost
  port: 5432
  name: mydb

JSON

{
  "app": {
    "name": "my-service",
    "port": 8080,
    "debug": false
  },
  "database": {
    "host": "localhost",
    "port": 5432,
    "name": "mydb"
  }
}

The dot notation in .properties (database.host) maps directly to nested keys in YAML and JSON. The converter handles this nesting automatically in both directions.

Key Features

1. All Six Conversion Directions

Properties → YAML, Properties → JSON, YAML → Properties, YAML → JSON, JSON → Properties, JSON → YAML - every combination in one tool.

2. Auto-Detect Source Format

Not sure what format you have? Click Auto-Detect and the tool identifies JSON, YAML, or .properties automatically based on the content.

3. Validate Before Converting

Click Validate to check your input for syntax errors before running the conversion - saves time on large config files.

4. Swap Source and Target

Click Swap to move the output back to input and reverse the conversion direction instantly.

5. Beautify JSON and YAML

Use Beautify to pretty-print and re-indent messy or minified input before converting.

6. Type Coercion for .properties

When parsing .properties, numeric values and booleans (true/false) are automatically typed correctly - so port=8080 becomes integer 8080 in JSON/YAML, not the string "8080".

When Do You Need This?

• Converting a Docker Compose YAML snippet to JSON for a config API
• Transforming a flat .properties file into a Kubernetes ConfigMap YAML
• Copying a config example from docs that uses a different format than your project
• Migrating between formats when switching tools - e.g. from a Java build tool to a Node.js or Python project
• Sharing config between a backend service (JSON API) and an infrastructure team (YAML)
• Verifying that two config files in different formats are semantically equivalent

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