config-merger-cli

Merge multiple config files (JSON, YAML) with deep merge, override priority, and environment variable interpolation.

Install

npm install -g config-merger-cli

Usage

# Merge two files (right side wins)
config-merge base.json override.json

# Merge chain (left to right, last wins)
config-merge base.yaml dev.yaml prod.yaml

# Output to file
config-merge base.json override.json --output result.json

# Output in a specific format
config-merge base.json override.json --format yaml

# Interpolate ${ENV_VAR} in string values
config-merge base.json override.json --env

# Concatenate arrays instead of overriding
config-merge base.json override.json --concat-arrays

# Dry-run: show colorized diff without writing
config-merge base.json override.json --dry-run

Options

| Flag | Description | |---|---| | -o, --output <file> | Write result to file | | -f, --format <fmt> | Output format: json or yaml | | -e, --env | Interpolate ${ENV_VAR} in string values | | --concat-arrays | Concatenate arrays instead of overriding | | --dry-run | Show diff without writing files |

Supported Formats

• JSON (.json)
• YAML (.yaml, .yml)

License

MIT © okirmio-create