npm-package-comparator

npm Package Comparator

Compare any set of npm packages side by side using live data from npm, GitHub, Bundlephobia, and Snyk — then give a clear recommendation based on what you actually need.

Pre-flight Check (REQUIRED)

Before making any TinyFish call, always run BOTH checks:

1. CLI installed?

which tinyfish && tinyfish --version || echo "TINYFISH_CLI_NOT_INSTALLED"

If not installed, stop and tell the user:

Install the TinyFish CLI: npm install -g @tiny-fish/cli

2. Authenticated?

tinyfish auth status

If not authenticated, stop and tell the user:

You need a TinyFish API key. Get one at: https://agent.tinyfish.ai/api-keys

Then authenticate:

tinyfish auth login

Do NOT proceed until both checks pass.

---

Step 1 — Gather inputs

You need:

• Package names — 2 to 4 packages to compare (e.g. zustand, jotai, redux)
• Use case (optional but improves recommendation) — e.g. "small React app", "large enterprise codebase", "need SSR support"

If the user hasn't specified a use case, ask:

"What are you building with it? (e.g. small side project, large team codebase, performance-critical app)"

If they don't know, proceed without it and give a general recommendation.

---

Step 2 — Parallel data fetch

For each package, fire agents across npm, GitHub, Bundlephobia, and Snyk simultaneously. Run ALL agents for ALL packages in parallel — one agent per package per source.

# ── For each PACKAGE, run all 4 agents in parallel ───────────

# npm stats
tinyfish agent run \
  --url "https://www.npmjs.com/package/{PACKAGE}" \
  "You are on the npm page for the package {PACKAGE}.
   Extract:
   - current version
   - weekly downloads (exact number shown)
   - total downloads if shown
   - last publish date
   - license
   - number of dependencies
   - TypeScript support (yes/no — check if types are listed)
   - maintainers count
   - repository URL
   STRICT RULES:
   - Do NOT click any links
   - Read only what is visible on this page
   - If a field is not shown, return null
   Return JSON: {package, version, weekly_downloads, last_published, license, dependency_count, typescript_support, maintainer_count, repo_url}" \
  --sync > /tmp/npm_{PACKAGE_SAFE}.json &

# GitHub stats
tinyfish agent run \
  --url "https://github.com/{OWNER}/{REPO}" \
  "You are on the GitHub repository page for {PACKAGE}.
   Extract:
   - star count
   - fork count
   - open issues count
   - last commit date
   - number of contributors (from sidebar or Insights)
   - latest release tag and date
   - whether the repo is actively maintained (check: last commit within 6 months)
   STRICT RULES:
   - Do NOT click any tabs or links
   - Read only what is visible on the main repo page
   Return JSON: {package, stars, forks, open_issues, last_commit, contributors, latest_release, latest_release_date, is_active}" \
  --sync > /tmp/gh_{PACKAGE_SAFE}.json &

# Bundle size
tinyfish agent run \
  --url "https://bundlephobia.com/package/{PACKAGE}" \
  "You are on the Bundlephobia page for {PACKAGE}.
   Extract:
   - minified size (in KB)
   - minified + gzipped size (in KB)
   - download time on slow 3G (if shown)
   - tree-shakeable (yes/no)
   - side-effect free (yes/no)
   STRICT RULES:
   - Do NOT click any links
   - Read only what is visible on this page
   - If the page hasn't loaded sizes yet, note it
   Return JSON: {package, minified_kb, gzipped_kb, tree_shakeable, side_effect_free}" \
  --sync > /tmp/bp_{PACKAGE_SAFE}.json &

# Known vulnerabilities
tinyfish agent run \
  --url "https://security.snyk.io/package/npm/{PACKAGE}" \
  "You are on the Snyk security page for the npm package {PACKAGE}.
   Extract:
   - total number of known vulnerabilities
   - number by severity: critical, high, medium, low
   - most recent vulnerability title and date (if shown)
   STRICT RULES:
   - Do NOT click any vulnerability links
   - Read only the summary visible on this page
   - If the page shows 'no vulnerabilities', return {total: 0}
   Return JSON: {package, total_vulns, critical, high, medium, low, latest_vuln_title, latest_vuln_date}" \
  --sync > /tmp/snyk_{PACKAGE_SAFE}.json &

# Repeat the above 4 agents for each additional package
# All backgrounded with & — fire everything at once then:
wait

# Collect all results
for p in {PACKAGE_LIST}; do
  echo "=== $p ===" 
  cat /tmp/npm_${p}.json
  cat /tmp/gh_${p}.json
  cat /tmp/bp_${p}.json
  cat /tmp/snyk_${p}.json
done