convert env file data to json

env-to-json.sh

#!/usr/bin/env bash
# This script converts environment variables to a JSON object.
# Usage: ./env-to-json.sh [.env file path]

set -euo pipefail

ENV_FILE="${1:-.env}"

# Function to escape JSON strings
json_escape() {
    local string="$1"
    # Escape backslashes, quotes, and control characters
    printf '%s' "$string" | \
        sed 's/\\/\\\\/g' | \
        sed 's/"/\\"/g' | \
        sed 's/\t/\\t/g' | \
        sed 's/\r/\\r/g' | \
        sed 's/\n/\\n/g'
}

# Start JSON object
echo "{"

first=true

# Read .env file if it exists
if [[ -f "$ENV_FILE" ]]; then
    while IFS= read -r line || [[ -n "$line" ]]; do
        # Skip empty lines and comments
        [[ -z "$line" || "$line" =~ ^[[:space:]]*# ]] && continue

        # Parse KEY=VALUE format
        if [[ "$line" =~ ^[[:space:]]*([A-Za-z_][A-Za-z0-9_]*)[[:space:]]*=[[:space:]]*(.*)[[:space:]]*$ ]]; then
            key="${BASH_REMATCH[1]}"
            value="${BASH_REMATCH[2]}"

            # Remove surrounding quotes if present
            if [[ "$value" =~ ^\"(.*)\"$ ]] || [[ "$value" =~ ^\'(.*)\'$ ]]; then
                value="${BASH_REMATCH[1]}"
            fi

            # Add comma separator if not first entry
            if [[ "$first" == true ]]; then
                first=false
            else
                echo ","
            fi

            # Output JSON key-value pair
            # Handle special cases: null, boolean, and empty values
            if [[ "$value" == "null" ]]; then
                printf '  "%s": null' "$key"
            elif [[ "$value" == "true" || "$value" == "false" ]]; then
                printf '  "%s": %s' "$key" "$value"
            elif [[ -z "$value" ]]; then
                printf '  "%s": ""' "$key"
            else
                printf '  "%s": "%s"' "$key" "$(json_escape "$value")"
            fi
        fi
    done < "$ENV_FILE"
else
    echo "  \"error\": \"File $ENV_FILE not found\"" >&2
fi

# Close JSON object
echo ""
echo "}"