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The vij-sdk is a lightweight, framework-agnostic library that works in both browser and Node.js environments.

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Requirements

  • Node.js 18+ (for Node.js environments)
  • Modern browser (for browser environments)
  • TypeScript 4+ (optional, for TypeScript projects)

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Installation

Install vij-sdk using your preferred package manager: 
npm install vij-sdk

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Basic Setup

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Browser Applications

For vanilla JavaScript, React, Vue, Svelte, or any browser-based framework: 
// src/main.jsx or src/index.js
import { init } from "vij-sdk";

// Initialize VIJ before rendering your app
init({
  endpoint: "https://your-vij-admin.com/api/logs",
  appId: "my-react-app",
  environment: "production"
});

// Then render your app
ReactDOM.createRoot(document.getElementById('root')).render(<App />);

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Node.js Applications

For Express, Fastify, or any Node.js backend: 
// server.js or index.js
import express from "express";
import { init } from "vij-sdk";

// Initialize VIJ at the very top
init({
  endpoint: "https://your-vij-admin.com/api/logs",
  appId: "my-api-server",
  environment: "production"
});

const app = express();

// Your server code
app.listen(3000, () => {
  console.log("Server running on port 3000");
});

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Next.js Applications

Next.js requires special handling for App Router vs Pages Router:
Create a client component for SDK initialization:
lib/vij.js
"use client";
import { init } from "vij-sdk";

if (typeof window !== "undefined") {
  init({
    endpoint: process.env.NEXT_PUBLIC_VIJ_ENDPOINT,
    appId: "my-nextjs-app",
    environment: process.env.NODE_ENV === "production" ? "production" : "development"
  });
}

export default function VijInit() {
  return null;
}
Then import in your root layout:
app/layout.js
import VijInit from "./lib/vij";

export default function RootLayout({ children }) {
  return (
    <html>
      <body>
        <VijInit />
        {children}
      </body>
    </html>
  );
}
Add environment variable to .env.local:
NEXT_PUBLIC_VIJ_ENDPOINT=https://your-vij-admin.com/api/logs

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TypeScript Setup

vij-sdk includes full TypeScript definitions out of the box. No additional @types package needed!
example.ts
import { init, captureException, captureMessage, type InitOptions } from "vij-sdk";

const options: InitOptions = {
  endpoint: "https://your-vij-admin.com/api/logs",
  appId: "my-ts-app",
  environment: "production",
  batch: true,
  maxBatchSize: 20
};

init(options);

// TypeScript will provide full IntelliSense
captureException(new Error("Test error"), { userId: 123 }, "error");
captureMessage("User logged in", { email: "user@example.com" }, "info");

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Verification

After installation, verify that VIJ is working: 
import { captureMessage } from "vij-sdk";

// Send a test message
captureMessage("VIJ SDK initialized successfully!", { test: true }, "info");
Check your VIJ Admin dashboard at /logs — you should see the test message appear within a few seconds.

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Module Formats

vij-sdk is distributed in multiple formats for maximum compatibility:
  • ESM (dist/index.mjs) - Modern JavaScript modules
  • CommonJS (dist/index.cjs) - Legacy Node.js require()
  • TypeScript (dist/index.d.ts) - Type definitions
The package.json exports field ensures the correct format is used automatically.

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Bundle Size

vij-sdk is designed to be lightweight:
  • Minified: ~8KB
  • Gzipped: ~3KB
  • Zero dependencies (except tslib for TypeScript helpers)
vij-sdk is tree-shakeable. If you only use certain functions, your bundler will exclude unused code.

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Troubleshooting

Issue: Cannot find module 'vij-sdk'Solution:
  • Ensure you ran npm install vij-sdk
  • Check that node_modules/vij-sdk exists
  • Try deleting node_modules and running install again
  • For Yarn/PNPM, ensure the package is in your lock file
Issue: Errors not appearing in dashboardSolution:
  • Verify init() is called before any other code
  • Check that endpoint URL is correct and accessible
  • Look for CORS errors in browser console
  • Ensure your VIJ Admin instance is running
  • Check Network tab for failed POST requests to /api/logs
Issue: Type errors or missing IntelliSenseSolution:
  • Ensure TypeScript 4+ is installed
  • Check that node_modules/vij-sdk/dist/index.d.ts exists
  • Try restarting your IDE/TypeScript server
  • Verify moduleResolution in tsconfig.json is set to “bundler” or “node16”
Issue: ReferenceError: window is not definedSolution:
  • Wrap init() in typeof window !== "undefined" check
  • Use "use client" directive for App Router components
  • See Next.js setup examples above

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Next Steps

Configuration

Learn about all available SDK configuration options

Capturing Errors

Understand how to capture errors and messages

API Reference

Explore the complete SDK API documentation

Quickstart Guide

Follow our end-to-end quickstart guide