Configuration

Config file

Create a registry-stats.config.json in your project root:

registry-stats --init

Example config:

{
  "registries": ["npm", "pypi", "nuget", "vscode", "docker"],
  "packages": {
    "mcpt": {
      "npm": "mcpt",
      "pypi": "mcpt"
    },
    "tool-compass": {
      "npm": "@mcptoolshop/tool-compass",
      "vscode": "mcp-tool-shop.tool-compass"
    }
  },
  "cache": true,
  "cacheTtlMs": 300000,
  "concurrency": 5
}

Run registry-stats with no arguments to fetch stats for all configured packages. The CLI walks up from cwd to find the nearest config file.

Config API

import { loadConfig, defaultConfig, starterConfig } from '@mcptoolshop/registry-stats';

const config = loadConfig();       // finds nearest config file, or null
const defaults = defaultConfig();  // returns default Config object
const template = starterConfig();  // returns starter JSON string

Caching

In-memory cache with 5-minute TTL (default):

const cache = createCache();
await stats('npm', 'express', { cache });

The StatsCache interface supports custom backends (synchronous — no async needed):

interface StatsCache {
  get(key: string): PackageStats | DailyDownloads[] | undefined;
  set(key: string, value: PackageStats | DailyDownloads[], ttlMs: number): void;
}

Custom registries

Add support for registries not built in:

import { registerProvider, type RegistryProvider } from '@mcptoolshop/registry-stats';

const cargo: RegistryProvider = {
  name: 'cargo',
  async getStats(pkg) {
    const res = await fetch(`https://crates.io/api/v1/crates/${pkg}`);
    const json = await res.json();
    return {
      registry: 'cargo' as any,
      package: pkg,
      downloads: { total: json.crate.downloads },
      fetchedAt: new Date().toISOString(),
    };
  },
};

registerProvider(cargo);
await stats('cargo', 'serde');

Config options reference

Field	Type	Default	Description
registries	string[]	All five	Default registries to query
packages	object	{}	Map of display names to registry-specific package IDs
cache	boolean	true	Enable in-memory caching
cacheTtlMs	number	300000	Cache TTL in milliseconds (5 minutes)
concurrency	number	5	Max concurrent requests for bulk operations
dockerToken	string	—	Docker Hub auth token (raises rate limits)

Built-in reliability

• Automatic retry with exponential backoff on 429/5xx errors
• Respects Retry-After headers
• 30-second request timeouts via AbortSignal.timeout
• Per-registry throttling (npm: 400ms, PyPI: 2.2s, Docker: 4s between requests)
• Concurrency limiting for bulk requests (default: 5)