This script converts a .env file to a JSON format

dotenv_to_json_converter.sh

sed 's/\r$//' .env | jq -Rn '
  reduce (inputs | select(length > 0) | capture("(?<key>[^=]+)=(?<value>.*)") | select(.key != null)) as {$key, $value} ({};
    if ($value | startswith("{") and endswith("}") and (try fromjson catch false)) then
      .[$key] = ($value | fromjson)
    else
      .[$key] = $value
    end
  )
' > env.json

Usage.md

Dotenv to JSON Converter

This script converts a .env file to a JSON format. Here's a breakdown of how it works:

1. Preprocessing with sed:

   sed 's/\r$//' .env

   • This command removes carriage returns (\r) at the end of each line in the .env file.
   • It handles both Windows (CRLF) and Unix (LF) line endings.

2. JSON Conversion with jq:

   jq -Rn '...'

   • -R: Tells jq to read input as raw strings, not JSON.
   • -n: Tells jq not to read any input initially (we'll use inputs inside the script).

3. Main Processing:

   reduce (inputs | select(length > 0) | capture("(?<key>[^=]+)=(?<value>.*)") | select(.key != null)) as {$key, $value} ({};
     if ($value | startswith("{") and endswith("}") and (try fromjson catch false)) then
       .[$key] = ($value | fromjson)
     else
       .[$key] = $value
     end
   )

   • inputs: Reads each line of the input.
   • select(length > 0): Skips empty lines.
   • capture("(?<key>[^=]+)=(?<value>.*)"): Splits each line into key and value.
   • select(.key != null): Ensures the line was successfully split.
   • reduce ... as {$key, $value} ({};...): Builds a JSON object from the key-value pairs.
   • The if statement checks if the value is a valid JSON object (starts with {, ends with }, and can be parsed as JSON).
     • If it is, it's parsed as JSON (allowing for nested structures).
     • If not, it's treated as a plain string.

4. Output:

   > env.json

   • This redirects the output to a file named env.json.

Usage

1. Save the script as dotenv_to_json_converter.sh
2. Make it executable: chmod +x dotenv_to_json_converter.sh
3. Run it: ./dotenv_to_json_converter.sh

The script will read from a file named .env in the current directory and output to env.json.