[PocketBase] The Perfect Stack for Solo Devs: Implement SMS Auth via JS Hooks in 5 Minutes (No Paperwork)

For solo developers and side-project builders looking to launch a Minimum Viable Product (MVP) quickly, building a backend from scratch is often a significant bottleneck. While Backend-as-a-Service (BaaS) solutions like Firebase or Supabase speed things up, they can sometimes feel restrictive when you need custom server-side logic.

Enter PocketBase—an incredibly lightweight, open-source backend contained within a single file. One of its most powerful features is JS Hooks, which allows you to write server-side routing and business logic using plain JavaScript, completely bypassing the need to learn Go.

However, having a fast backend setup doesn't solve one of the biggest headaches in modern app development: SMS Authentication. Historically, integrating an SMS verification API meant dealing with a mountain of paperwork—submitting business registrations, proving mobile carrier subscriptions, pre-registering caller IDs, and waiting days for approval.

What if you could bypass all of that?

In this comprehensive tutorial, we will explore how to combine the single-file power of PocketBase with EasyAuth, a developer-centric SMS API that requires absolutely zero paperwork. By leveraging PocketBase JS Hooks, you can build a fully functional, highly secure SMS authentication API in just 5 minutes.

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Why Choose the PocketBase + EasyAuth Stack?

Before we dive into the code, let’s look at why this specific combination is the ultimate setup for solo developers, freelancers, and early-stage startups.

1. PocketBase JS Hooks: Extreme Productivity

PocketBase comes with an embedded Goja (V8-compatible) engine. This means you can drop a JavaScript file into a pb_hooks folder, and PocketBase will automatically parse it to create custom server-side routes, middleware, and background jobs. There’s no complex build step, no Node.js environment to configure, and no heavy dependencies to install.

2. EasyAuth: The Ultimate SMS API for MVPs

EasyAuth fundamentally tears down the barriers to entry that plague traditional SMS providers:

• Zero Paperwork: No need to submit business registration certificates or identity proofs.
• Instant Onboarding: Sign up, get your API key, and integrate within 5 minutes.
• Automatic Caller ID: Forget the cumbersome process of pre-registering your sending numbers.
• Cost-Effective: At roughly 15 to 25 KRW per message, it is nearly 50% cheaper than legacy competitors (which typically charge 30-50 KRW).
• Free Tier: EasyAuth provides 10 free messages upon sign-up, allowing you to test your integration without spending a dime.

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Step-by-Step Implementation Guide

In this tutorial, we will create two custom API endpoints using PocketBase JS Hooks:

1. POST /api/sms/send: To trigger an SMS containing a One-Time Password (OTP).
2. POST /api/sms/verify: To check if the user-provided code matches the sent OTP.

Step 1. Prerequisites and Setup

First, make sure you have the essentials ready:

1. Download PocketBase: Head over to the PocketBase official website and download the standalone executable for your operating system.
2. Get Your EasyAuth API Key: Visit EasyAuth, create an account, and grab your API key. (You'll also receive 10 free test credits instantly).

Step 2. Creating the JS Hooks Directory

Navigate to the directory where your PocketBase executable is located. Create a new folder named pb_hooks. Inside this folder, create a JavaScript file named main.pb.js. Your directory structure should look like this:

project-folder/
├── pocketbase (The executable file)
└── pb_hooks/
    └── main.pb.js

PocketBase automatically detects any .js files inside the pb_hooks directory upon startup.

Step 3. Implementing the /send Endpoint

We need an endpoint that accepts a phone number from the client frontend and forwards it to EasyAuth to send the text message. We will use the built-in $http.send global object provided by PocketBase to make external HTTP requests.

Open main.pb.js and add the following code:

// pb_hooks/main.pb.js

// 1. Endpoint to Send SMS Verification Code
routerAdd("POST", "/api/sms/send", (e) => {
    // Extract payload from the client request
    const body = $apis.requestInfo(e).data;
    const phone = body.phone;

    // Basic validation
    if (!phone) {
        return e.json(400, { error: "Phone number is required." });
    }

    try {
        // Call the EasyAuth /send API
        const res = $http.send({
            url: "https://api.easyauth.co/send",
            method: "POST",
            body: JSON.stringify({ phone: phone }),
            headers: {
                "Content-Type": "application/json",
                "Authorization": "Bearer YOUR_EASYAUTH_API_KEY" // Replace with your actual key
            }
        });

        // Pass the EasyAuth response back to the client
        return e.json(200, res.json);
    } catch (err) {
        // Handle potential network or API errors gracefully
        return e.json(500, { 
            error: "Failed to send SMS.", 
            details: err.message 
        });
    }
});

Step 4. Implementing the /verify Endpoint

Next, we need an endpoint to verify the code the user entered. EasyAuth’s /verify API is stateless and handles the logic internally, which means you don't even need to set up Redis or build database tables in PocketBase to temporarily store the OTP codes.

Append the following code to your main.pb.js file:

// 2. Endpoint to Verify SMS Code
routerAdd("POST", "/api/sms/verify", (e) => {
    // Extract phone and code from the client request
    const body = $apis.requestInfo(e).data;
    const phone = body.phone;
    const code = body.code;

    // Validate input presence
    if (!phone || !code) {
        return e.json(400, { error: "Both phone and code are required." });
    }

    try {
        // Call the EasyAuth /verify API
        const res = $http.send({
            url: "https://api.easyauth.co/verify",
            method: "POST",
            body: JSON.stringify({ phone: phone, code: code }),
            headers: {
                "Content-Type": "application/json",
                "Authorization": "Bearer YOUR_EASYAUTH_API_KEY" // Replace with your actual key
            }
        });

        // Return verification results
        return e.json(200, res.json);
    } catch (err) {
        return e.json(500, { 
            error: "Failed to verify code.", 
            details: err.message 
        });
    }
});

Step 5. Running and Testing the Server

Now, start your PocketBase server via your terminal:

./pocketbase serve

You should see output indicating that the server is running and your custom hooks have been loaded. You can test your brand new endpoints immediately using tools like Postman, Insomnia, or standard cURL commands.

Testing the Send API:

curl -X POST http://127.0.0.1:8090/api/sms/send \
  -H "Content-Type: application/json" \
  -d '{"phone": "01012345678"}'

Testing the Verify API:

curl -X POST http://127.0.0.1:8090/api/sms/verify \
  -H "Content-Type: application/json" \
  -d '{"phone": "01012345678", "code": "123456"}'

If everything is set up correctly, you should receive an SMS on your device almost instantaneously, and subsequently verify it!

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Tips & Best Practices for Production

While the code above works flawlessly for a quick MVP, you should implement a few best practices when transitioning to a production environment.

1. Secure Your API Keys Using Environment Variables

Never hardcode API keys directly into your source code. Instead, set an environment variable on your server and access it dynamically within PocketBase. PocketBase JS Hooks allow you to read environment variables using $os.getenv().

const apiKey = $os.getenv("EASYAUTH_API_KEY");
// Use `apiKey` in your headers instead of the raw string.

2. Client-Side Input Validation

Before dispatching a request to your POST /api/sms/send endpoint, ensure your frontend application validates the phone number format using Regular Expressions (Regex). This prevents unnecessary API calls and helps you save on your EasyAuth credits.

3. Implement Rate Limiting

To prevent abuse or malicious bot activities from depleting your SMS balance, it is highly recommended to implement rate limiting. You can achieve this by creating a "Verification Logs" collection within PocketBase to track requests by IP address or phone number, ensuring a specific number can only request an OTP once every few minutes.

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Conclusion

Combining the raw simplicity of PocketBase’s JS Hooks with the developer-friendly architecture of EasyAuth represents the fastest, most modern way to implement SMS authentication today.

For solo developers, freelancers, and startup founders rushing to launch an MVP, getting bogged down by bureaucratic paperwork just to send a text message is unacceptable. By utilizing EasyAuth, you bypass the red tape entirely, get automatic caller ID functionality out of the box, and save up to 50% on messaging costs.

Don't let legacy API requirements slow down your development momentum. You can build a robust, production-ready SMS verification flow in literally 5 minutes.

> 🚀 Ready to streamline your authentication? > Skip the paperwork and integrate the easiest SMS API built specifically for developers. > 👉 Start your free trial with EasyAuth today!