:key: .env -> .env.json
$ [sudo] pip install env2json
.env.dev
DB_NAME=name
DB_USER=username
DB_HOST=127.0.0.1
DB_PORT=5432
$ python -m env2json .env.dev > .env.dev.json
.env.dev.json
{
"DB_HOST": "127.0.0.1",
"DB_NAME": "name",
"DB_PORT": "5432",
"DB_USER": "username"
}