How are nested objects handled?

Nested objects are flattened into a single level using underscores, so {"API": {"KEY": "x"}} becomes API_KEY=x. Arrays and remaining objects are serialised back to compact JSON and quoted.

When are values quoted?

A value is wrapped in double quotes whenever it contains whitespace, a hash, an equals sign, a quote or a newline, or is empty. Plain numbers and booleans are written unquoted. This matches how dotenv parsers expect values.

Is my config uploaded anywhere?

No. The conversion runs entirely in your browser as JavaScript. Your JSON is never sent to a server.

JSON to .env Converter

Turn a JSON config object into dotenv key=value lines — in your browser.

JSON to .env converter

Paste a JSON configuration object and get back a .env file of KEY=value lines. Nested objects are flattened with underscores (API.KEY becomes API_KEY), and any value containing spaces, a #, an = or a newline is automatically wrapped in double quotes so dotenv parsers read it correctly. Numbers and booleans are written unquoted.

Everything runs in your browser — your configuration never leaves your device.