Hallmark API Endpoints: A Complete Technical Guide

Hallmark does not expose its own API endpoints—it is a purely client‑side static tool that makes exactly one external call to the GitHub REST API to fetch repository star counts.

Hallmark is a lightweight, browser‑based design skill created by Nutlope. Unlike server‑dependent applications, it runs entirely in the frontend and relies on no self‑hosted API infrastructure. This article breaks down the single network interaction Hallmark performs and how it implements client‑side caching for performance.

Does Hallmark Have Its Own API?

No. Hallmark is architected as a static, serverless project. All functionality executes in the browser via vanilla JavaScript loaded from site/js/main.js. There are no backend routes, no REST controllers, and no server‑side logic to maintain.

The package.json at the repository root confirms this: it lists only build‑time dependencies and static site tooling, with no server framework or API server configuration.

The Only External API Call: GitHub REST API

Hallmark makes precisely one HTTP request—a GET to the public GitHub REST API. This call retrieves the repository's star count for display on the landing page.

Request Details

Aspect	Value
Endpoint	https://api.github.com/repos/nutlope/hallmark
Method	GET
Headers	Accept: application/vnd.github+json
Source file	site/js/main.js (lines 712‑720)
Purpose	Fetch stargazers_count for UI display

Implementation in site/js/main.js

The fetch logic includes error handling, response validation, and immediate cache population:

// Retrieve the star count from the public GitHub API and cache it.
fetch(`https://api.github.com/repos/${REPO}`, {
  headers: { Accept: "application/vnd.github+json" }
})
  .then(r => (r.ok ? r.json() : null))
  .then(d => {
    if (!d || typeof d.stargazers_count !== "number") return;
    const n = d.stargazers_count;
    starEl.textContent = format(n);
    localStorage.setItem(CACHE_KEY, JSON.stringify({ n, t: Date.now() }));
  })
  .catch(() => { /* leave cached value unchanged */ });

The REPO variable resolves to nutlope/hallmark, and CACHE_KEY is a namespaced localStorage key specific to this data.

Client‑Side Caching Strategy

To minimize redundant API calls and improve perceived performance, Hallmark implements a time‑based caching layer using localStorage.

Cache Behavior

• TTL (time‑to‑live): 1 hour (3,600,000 milliseconds)
• Fallback: Stale cached values are displayed immediately while fresh data is fetched in the background
• Storage format: JSON string with numeric count and timestamp

Cache Retrieval Logic

From site/js/main.js, the page‑load sequence attempts to restore any cached value before initiating the network request:

// On page load, show a cached star count if it exists (even if stale).
try {
  const raw = localStorage.getItem(CACHE_KEY);
  if (raw) {
    const cached = JSON.parse(raw);
    if (cached && typeof cached.n === "number") {
      starEl.textContent = format(cached.n);
      cachedFresh = Date.now() - cached.t < TTL;
    }
  }
} catch (e) { /* ignore errors (e.g., private‑mode localStorage) */ }

This pattern ensures instant UI rendering even when the GitHub API is slow or unavailable.

Key Files and Their Roles

File	Role in API Architecture
site/js/main.js	Contains the sole API consumer logic, caching implementation, and DOM updates
site/index.html	Loads the JavaScript; contains no direct API references
package.json	Project metadata only; no server or API dependencies
site/css/*.css	Static styles; no network layer involvement

Why This Architecture Matters

Hallmark's zero‑API design offers several advantages:

1. Zero hosting costs — No server infrastructure to provision or scale
2. Maximum portability — Deployable to any static host (GitHub Pages, Vercel, Netlify)
3. Privacy by default — No user data touches external servers
4. Resilience — Cached values ensure functionality even during API outages

Summary

• Hallmark provides no native API endpoints—it is a client‑only static application
• The GitHub REST API (api.github.com/repos/nutlope/hallmark) is the sole external service consumed
• All network logic lives in site/js/main.js with one‑hour localStorage caching
• The architecture prioritizes speed, simplicity, and zero server maintenance

Frequently Asked Questions

Does Hallmark expose a public API I can call?

No. Hallmark has no server component and therefore exposes no API endpoints. Any integration needs must be built against the GitHub API directly or implemented client‑side in a fork of the project.

How does Hallmark handle GitHub API rate limits?

Hallmark caches responses in localStorage for one hour, reducing requests to at most one per hour per browser session. The GitHub API permits 60 unauthenticated requests per hour per IP address, so typical usage stays well within limits.

What happens if the GitHub API is unavailable?

The application gracefully degrades. Cached star counts remain visible indefinitely, and network errors are silently caught without breaking the UI. Users see potentially stale data rather than an error state.

Can I modify the caching duration?

Yes. In site/js/main.js, locate the TTL constant (line ~700) and adjust its millisecond value. A shorter TTL yields fresher data but increases API usage; a longer TTL reduces requests but may display outdated counts.

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}