Introduction

properties-to-js is a small Node.js tool and npm package (@yartasdev/properties-to-js) that reads Java .properties files and produces JavaScript, TypeScript, or JSON output.

What it does

• Turn config files (application.properties, etc.) into modules you can use in front-end or Node projects.
• Automatically expand flat dotted keys (db.host, db.port) into nested objects.
• Optionally flatten keys (flatted) and transform key casing to upper or lower case.

Flow at a glance

1. Parse a .properties file or string (comments, escapes, multiline values).
2. Process the flat key–value map with unflatten or flatten, depending on options.
3. Format for the chosen output type and write to a file or return a string.

Next steps: Installation, CLI, or Programmatic API.