How I Solved the WooCommerce REST API “401 Unauthorized” Error in Astro

Building a headless e-commerce site with Astro and WooCommerce seems straightforward until you try to connect your local development environment to the API. If you’ve been hitting a wall with 401 Unauthorized errors or circular structure crashes, here is exactly how I fixed it.

The Problems I Faced

1. The Insecure HTTP Block

By default, WooCommerce REST API keys (Consumer Key/Secret) require HTTPS. When working on a local site like http://e-commerce.local, WooCommerce rejects “Basic Auth” because it’s sent in plain text.

2. Library Compatibility Issues

Using the official @woocommerce/woocommerce-rest-api package in Astro/Vite often triggers a TypeError: ... is not a constructor. This is due to how Vite handles CommonJS modules. Furthermore, when an error occurs, the library returns a circular object that crashes Astro with a Converting circular structure to JSON error.

3. LocalWP “Live Link” Hurdles

Moving to a “Live Link” (HTTPS) introduces SSL certificate issues. Node.js (Astro’s backend) blocks self-signed certificates, leading to failed requests even when the URL is technically “public.”

The Solution: A Proper, Production-Ready Approach

Instead of using “hacky” fixes, I moved to a standardized method that works both locally and on Cloudflare edge servers.

Step 1: Use WordPress Application Passwords

Instead of WooCommerce-specific keys, use WordPress Application Passwords. They are more compatible with standard HTTP headers.

1. Go to Users > Profile in WordPress.
2. Generate a new Application Password.

Step 2: Switch to Native Fetch (No Libraries)

To avoid the “constructor” and “circular JSON” errors, use the native fetch API. It is lighter and works perfectly on Cloudflare.

---
const username = "saiful";
const appPassword = "your-24-character-password-here";
const siteUrl = "http://e-commerce.local";

// Base64 encode for Basic Auth
const auth = Buffer.from(`${username}:${appPassword}`).toString('base64');

let products = [];

try {
  const response = await fetch(`${siteUrl}/wp-json/wc/v3/products`, {
    headers: {
      'Authorization': `Basic ${auth}`,
      'Content-Type': 'application/json'
    }
  });

  if (!response.ok) throw new Error("API Connection Failed");
  products = await response.json();
} catch (error) {
  console.error("Connection Error:", error.message);
}
---

⚠️ Important Note

Never hardcode your WooCommerce credentials (username, application password, or API keys) directly in your code.
Always use environment variables to keep sensitive data secure.

If you’re deploying to platforms like Cloudflare Pages or Workers, make sure to store these values in your environment settings—not in your repository.

Also, avoid exposing authentication details to the client. All API requests involving credentials should be handled server-side only.

Summary

By switching from WooCommerce Keys to WordPress Application Passwords and using native fetch, I removed the need for extra libraries and fixed the authentication block. This setup is now ready to be deployed to Cloudflare!