Introduction

NestLens is an elegant debugging and monitoring assistant for NestJS applications, inspired by Laravel Telescope. It provides deep insights into your application's behavior during development with a beautiful, real-time dashboard.

What is NestLens?

NestLens captures and visualizes everything happening in your NestJS application:

• HTTP Requests - Track all incoming requests with headers, body, response, and timing
• Database Queries - Monitor SQL queries with slow query detection
• Exceptions - Capture errors with full stack traces and request context
• Application Logs - View all log entries with level filtering
• Background Jobs - Track Bull/BullMQ queue jobs
• Scheduled Tasks - Monitor cron jobs and scheduled tasks
• Cache Operations - Track cache hits, misses, and operations
• And much more... - 18 watchers in total!

Why NestLens?

Feature	Description
Zero Configuration	Works out of the box with sensible defaults
18 Watchers	Complete visibility into every aspect of your app
Beautiful Dashboard	Modern React UI with dark mode support
Family Tracking	Group related entries by request or operation
Automatic ORM Detection	Built-in support for TypeORM and Prisma
TypeScript Native	Full type safety throughout
Production Ready	1,312 tests ensuring quality

Quick Preview

app.module.ts

import { Module } from '@nestjs/common';
import { NestLensModule } from 'nestlens';

@Module({
  imports: [
    NestLensModule.forRoot({
      enabled: process.env.NODE_ENV !== 'production',
    }),
  ],
})
export class AppModule {}

That's it! Open http://localhost:3000/nestlens to see your dashboard.

Comparison with Alternatives

Feature	NestLens	Nest DevTools	Custom Logging
Real-time Dashboard	Yes	Yes	No
Database Query Tracking	Yes	Limited	Manual
Family Grouping	Yes	No	No
Slow Query Detection	Yes	No	No
18 Entry Types	Yes	No	No
Dark Mode	Yes	No	N/A
Rate Limiting	Yes	N/A	Manual
Price	Free	Paid	Free

What's Next?

Get started with NestLens in just a few minutes:

• Installation - Install NestLens in your project
• Quick Start - Set up in 3 simple steps
• Watchers Overview - Learn about all 18 watchers