JSON to .env Converter
JSON → .env. Nested keys are flattened to SCREAMING_SNAKE_CASE, and values containing spaces, quotes, # or newlines are quoted and escaped.
JSON to .env Converter — Free Online Tool
Converts a JSON configuration object into .env format, flattening nested objects into SCREAMING_SNAKE_CASE keys with a configurable separator, serializing arrays and objects that cannot be flattened as compact JSON, and quoting values that contain spaces, newlines or the hash character so the file parses correctly.
How to use the JSON to .env Converter
- Open the tool above — it runs entirely in your browser, so your input never leaves this page.
- Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
- Copy the result from the output area with the copy button orCtrl/Cmd + C.
- No signup, no upload, and no tracking — repeat as often as you need.
Frequently asked questions
How are nested objects flattened?
Each path segment is converted to SCREAMING_SNAKE_CASE and joined with the separator, so db.pool.max becomes DB__POOL__MAX with the default. Pick the separator your framework's configuration binder expects.
What happens to arrays?
There is no standard flat encoding for a list. By default the array is serialized as compact JSON so it round-trips exactly; switch to comma-joined when the consumer expects a simple delimited string.
When is a value quoted?
Whenever it contains anything a dotenv parser would misread — a space, a hash (which would start a comment), a quote, or a newline. Those values are double-quoted with backslash escapes.
Free & private — why use this JSON to .env Converter
The JSON to .env Converter runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.