# Package Registry Scraper — npm, PyPI, crates (`ponderable_hydrometer/package-registry-scraper`) Actor

Package intelligence across npm, PyPI & crates.io — version, license, repo, dependencies & monthly downloads. Search or look up by name. Free keyless APIs.

- **URL**: https://apify.com/ponderable\_hydrometer/package-registry-scraper.md
- **Developed by:** [Ponderable Hydrometer](https://apify.com/ponderable_hydrometer) (community)
- **Categories:** Developer tools, Automation, SEO tools
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

from $1.50 / 1,000 results

This Actor is paid per event. You are not charged for the Apify platform usage, but only a fixed price for specific events.

Learn more: https://docs.apify.com/platform/actors/running/actors-in-store#pay-per-event

## What's an Apify Actor?

Actors are web data automations that power AI and operations. They run on the Apify platform to scrape websites, process data, connect APIs, and automate workflows.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.
Actors are written with capital "A".

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.
The best way to integrate Actors is as follows.

- **AI agents and MCP clients** — the [Apify MCP server](https://docs.apify.com/integrations/mcp.md) at `https://mcp.apify.com` (remote, streamable HTTP, OAuth on first use).
- **Agentic workflows and local Actor development** — [Agent Skills](https://apify.com/.well-known/agent-skills/index.json) with the [Apify CLI](https://docs.apify.com/cli/docs.md): `npm install -g apify-cli`, then `apify login`.
- **JavaScript/TypeScript projects** — the official [JS/TS client](https://docs.apify.com/api/client/js/docs.md): `npm install apify-client`.
- **Python projects** — the official [Python client](https://docs.apify.com/api/client/python/docs.md): `pip install apify-client`.
- **Any other language** — the [REST API](https://docs.apify.com/api/v2.md).

For usage examples, see the [API](#api) section below.

For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt).

# README

## Package Registry Scraper — npm, PyPI & crates.io

**Unified package intelligence across three ecosystems — npm, PyPI and crates.io — in one actor and one output shape.** Look up by name or search (npm/crates), and get version, license, repository, dependency count and monthly downloads. Free, keyless, no proxies.

Instead of three different APIs with three different shapes, this actor normalizes all three registries into one consistent row — ideal for OSS market research, dependency auditing and tech due diligence.

### What you get

One row per package, same fields across every registry:

- `registry` (`npm`/`pypi`/`crates`), `name`, `version`, `description`
- **Links** — `homepage`, `repository` (cleaned git URL), canonical `url`
- `license`, `keywords`, `author`
- **Signals** — `dependenciesCount`, `downloadsLastMonth`, `latestReleaseDate`
- crates.io also returns `downloadsTotal`

### Output sample

npm (`registry: "npm"`):

```json
{
  "registry": "npm",
  "name": "express",
  "version": "4.19.2",
  "description": "Fast, unopinionated, minimalist web framework",
  "homepage": "http://expressjs.com/",
  "repository": "https://github.com/expressjs/express",
  "license": "MIT",
  "keywords": ["express", "framework", "web", "http"],
  "author": "TJ Holowaychuk",
  "dependenciesCount": 31,
  "downloadsLastMonth": 128394021,
  "latestReleaseDate": "2024-03-25T18:00:00.000Z",
  "url": "https://www.npmjs.com/package/express"
}
```

### Input

| Field | Type | Default | Description |
|-------|------|---------|-------------|
| `registry` | string | `npm` | `npm`, `pypi` or `crates` |
| `packages` | array | `["express","react"]` | Specific package names to look up |
| `query` | string | — | Keyword search — **npm & crates only** (PyPI has no public search API) |
| `maxResults` | integer | `100` | Cap on packages returned |

Provide `packages` and/or a `query`.

### Example input

```json
{
  "registry": "npm",
  "packages": ["express", "react", "vue"]
}
```

crates search:

```json
{ "registry": "crates", "query": "async runtime", "maxResults": 25 }
```

### Why this actor

- **Three registries, one shape** — no per-ecosystem glue code on your side.
- **Signals, not just metadata** — monthly downloads, dependency count and release date.
- **Keyless & reliable** — official public APIs with auto-retry on rate limits.
- **Search + lookup** — keyword search (npm/crates) plus direct name lookup.

### Pricing

Pay per result — **$1.50 per 1,000 results** (one package = one result). No subscription or platform fees.

### Related actors

- **GitHub Search Scraper** — repos, users and issues for deeper OSS due diligence.
- **Hacker News Scraper** — developer sentiment and launch signals.
- **Website Tech Stack Detector** — technographics for a target's live stack.

### Notes

- Data is from each registry's official public API; the actor sets a descriptive User-Agent and retries on 429/5xx.
- **PyPI search is unavailable** (no public search API) — pass explicit `packages` for PyPI.
- Some fields differ by registry (e.g. crates has no per-package author or dependency count) and are returned as `null`.
- This actor is an independent tool, not affiliated with npm, the PSF/PyPI or the Rust Foundation.

# Actor input Schema

## `registry` (type: `string`):

Which package registry to query.

## `packages` (type: `array`):

Specific packages to look up, e.g. \["express","react"] (npm), \["requests","numpy"] (pypi), \["serde","tokio"] (crates).

## `query` (type: `string`):

Keyword search — supported for npm and crates. PyPI has no public search API (use 'packages').

## `maxResults` (type: `integer`):

Cap on number of packages returned.

## Actor input object example

```json
{
  "registry": "npm",
  "packages": [
    "express",
    "react"
  ],
  "maxResults": 100
}
```

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "packages": [
        "express",
        "react"
    ]
};

// Run the Actor and wait for it to finish
const run = await client.actor("ponderable_hydrometer/package-registry-scraper").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = { "packages": [
        "express",
        "react",
    ] }

# Run the Actor and wait for it to finish
run = client.actor("ponderable_hydrometer/package-registry-scraper").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print("💾 Check your data here: https://console.apify.com/storage/datasets/" + run["defaultDatasetId"])
for item in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "packages": [
    "express",
    "react"
  ]
}' |
apify call ponderable_hydrometer/package-registry-scraper --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "command": "npx",
            "args": [
                "mcp-remote",
                "https://mcp.apify.com/?tools=ponderable_hydrometer/package-registry-scraper",
                "--header",
                "Authorization: Bearer <YOUR_API_TOKEN>"
            ]
        }
    }
}

```

## OpenAPI specification

Download the OpenAPI definition: https://api.apify.com/v2/actors/A3hoBh2EORB86ndPr/builds/Xg8oSeVcGw3ZiKQ28/openapi.json