Preview

Requirements

Since version 1.4.0, npm-deprecated-check requires Node.js 18 or higher.

Install

npm install -g npm-deprecated-check

Features

• Check the packages of current project, global or specified is deprecated.
• According to the version range of lockfile and package.json.
• Additionally checks if the running node version reached End Of Life.
• Return the minimum upgradable version.
• Check if the current environment meets the Node.js version range required for dependency operation.
• Calculate the minimum Node.js version required across all dependencies.
• Suggest compatible dependency versions when Node.js version requirements are not met.
• Check Node.js version compatibility for a project or package when upgrading or downgrading Node.js.
• MCP Server support: expose tools for external AI agents to consume deprecation data.

Node.js Version Compatibility

The tool automatically analyzes Node.js version requirements across all dependencies and provides helpful information.

Default Output

By default, you get a concise summary showing the recommended engines.node value:

Node Version Summary:
Minimum engines.node: >=20.0.0

Recommendation: Update package.json engines.node to ">=20.0.0"
   Current: >=18.12

Detailed Output (--verbose)

Use the --verbose flag for detailed information:

ndc current --verbose

Node Version Summary (detailed):
Minimum Node version (production): 20.0.0
  Determined by: [email protected]
Minimum Node version (development): 20.17.0
  Determined by: [email protected]
Current Node version: v25.4.0
Project engines.node: >=18.12

Production dependencies require Node >=20.0.0, but package.json allows >=18.12
   Consider updating engines.node to ">=20.0.0"

Compatible Version Suggestions

When a dependency requires a newer Node.js version than you're currently running, the tool suggests a compatible alternative version:

WARN  [email protected]: 2024-10-05T18:45:12.345Z
Required node: ^18.18.0 || ^20.9.0 || >=21.1.0
Compatible version for current Node: 8.57.1

Usage

Usage: ndc <command> [options]

Options:
  -V, --version                    output the version number
  -h, --help                       display help for command

Commands:
  current [options]                check the packages of the current project
  global [options]                 check global packages, default: npm
  package [options] <packageName>  check for specified package
  compat [options] [packageName]   check Node.js version compatibility for project or package
  node                             check if used node version is deprecated (reached End Of Life)
  config [options]                 inspect and modify the config
  help [command]                   display help for command

For current:

Options:
  --registry <value>        specify registry URL, default: https://registry.npmjs.org/
  --ignore <value>          ignore specific packages, example: request,tslint
  --failfast                exit the program if it has been deprecated
  --deep                    deep inspection for monorepo projects
  --verbose                 show detailed Node version compatibility information

For global:

Options:
  -m, --manager <value>      check specified package manager (choices: "npm", "yarn", "pnpm")
  --registry <value>        specify registry URL, default: https://registry.npmjs.org/
  --ignore <value>          ignore specific packages, example: request,tslint
  --failfast                exit the program if it has been deprecated

For package:

Options:
  -r, --range <value>       check specified versions
  --registry <value>        specify registry URL, default: https://registry.npmjs.org/

For compat:

Usage: ndc compat [packageName] [options]

check Node.js version compatibility for project or package

Options:
  --node <version>          target Node.js version (e.g. "18", "20.11.0"), default: current Node version
  --deep                    deep inspection for monorepo projects (project mode only)
  --ignore <value>          ignore specific packages, example: request,tslint
  --registry <value>        specify registry URL, default: https://registry.npmjs.org/

Compat Examples

Check current project against the current Node version:

ndc compat

Check current project against a target Node version:

ndc compat --node 18

Check a specific package against a target Node version:

ndc compat esbuild --node 18

Deep check monorepo projects:

ndc compat --node 20 --deep

You can also save options to global configuration:

Usage: ndc config [options]

inspect and modify the config

Options:
  -g, --get <path>          get value from option
  -s, --set <path> <value>  set option value
  -d, --delete <path>       delete option from config
  -l, --list                list all options

MCP Server

npm-deprecated-check can run as an MCP (Model Context Protocol) Server, exposing its checking capabilities as tools for AI agents.

Start the MCP Server

npx -y npm-deprecated-check --mcp

Client Configuration

Claude Desktop / OpenCode (recommended: global install):

{
  "mcpServers": {
    "npm-deprecated-check": {
      "command": "npm-deprecated-check",
      "args": ["--mcp"]
    }
  }
}

Install globally first: npm install -g npm-deprecated-check

Claude Desktop / OpenCode (npx):

{
  "mcpServers": {
    "npm-deprecated-check": {
      "command": "npx",
      "args": ["-y", "npm-deprecated-check", "--mcp"]
    }
  }
}

Available Tools

| Tool | Description | |------|-------------| | check_package | Check if a specific npm package is deprecated | | check_current_project | Check all dependencies of the current project | | check_global | Check globally installed packages | | check_node | Check if the current Node.js version has reached EOL | | check_compat | Check Node.js version compatibility for a project or package |

All tools return structured JSON data. The AI agent can use this data to provide recommendations, suggest alternatives, or generate reports.

Tool Parameters

check_package:

• packageName (required) — npm package name
• range (optional) — version range, e.g. "^1.0.0"
• registry (optional) — custom npm registry URL

check_current_project:

• ignore (optional) — comma-separated package names to ignore
• deep (optional) — deep inspection for monorepo projects
• registry (optional) — custom npm registry URL

check_global:

• manager (optional) — package manager: "npm", "yarn", or "pnpm" (default: "npm")
• ignore (optional) — comma-separated package names to ignore
• registry (optional) — custom npm registry URL

check_node: No parameters.

check_compat:

• packageName (optional) — npm package name. If not provided, checks the current project
• nodeVersion (optional) — target Node.js version (e.g. "18", "20.11.0"). Defaults to current Node version
• projectPath (optional) — absolute path to project root (only used when packageName is not provided)
• deep (optional) — deep inspection for monorepo projects
• ignore (optional) — comma-separated package names to ignore
• registry (optional) — custom npm registry URL

Credits

npm-deprecated-check is inspired by check-is-deprecated.