treblle

The official Treblle SDK for JavaScript frameworks including NestJS. Seamlessly integrate Treblle to manage communication with your dashboard, send errors, and secure sensitive data.

Treblle with NestJS

To integrate Treblle with NestJS, we provide an official unified SDK for JavaScript frameworks - treblle-node.

NestJS uses Express under the hood, so Treblle integrates by accessing the underlying Express instance.

Requirements

Node.js: >=16.0.0
NestJS: 9.x, 10.x, or 11.x

Installation


npm install treblle@^2.0.0

Don’t forget to load the required modules:


const { useNestTreblle } = require("treblle");

Setting up credentials

Create a free account on treblle.com to get your credentials:

sdkToken (SDK Token)
apiKey (API Key)

Add these to your .env file:


TREBLLE_SDK_TOKEN=your_sdk_token
TREBLLE_API_KEY=your_api_key

Basic Setup

Initialize Treblle in your main.ts file:


import { NestFactory } from "@nestjs/core";
import { AppModule } from "./app.module";
import { useNestTreblle } from "treblle";
 
async function bootstrap() {
  const app = await NestFactory.create(AppModule);
 
  // Get the underlying Express instance
  const expressInstance = app.getHttpAdapter().getInstance();
 
  // Add Treblle middleware
  useNestTreblle(expressInstance, {
    sdkToken: process.env.TREBLLE_SDK_TOKEN,
    apiKey: process.env.TREBLLE_API_KEY,
  });
 
  await app.listen(3000);
}
 
bootstrap();

Tip

That’s it! Your API requests and responses are now being sent to your Treblle Dashboard. You’ll get features like auto-documentation, real-time request/response monitoring, and error tracking.

Configuration Options

You can pass additional configuration options:


useNestTreblle(expressInstance, {
  sdkToken: process.env.TREBLLE_SDK_TOKEN,
  apiKey: process.env.TREBLLE_API_KEY,
  additionalFieldsToMask: ["customSecret", "internalId"], // Optional
  blocklistPaths: ["admin", "health"], // Optional: Skip logging certain paths
  ignoreDefaultBlockedPaths: false, // Optional: Disable default blocked paths
  debug: true, // Optional: Show Treblle errors in console
});

Available options:

Option

Description

sdkToken (required)

Your Treblle SDK token

apiKey (required)

Your Treblle API key

additionalFieldsToMask (optional)

Array of field names to mask in addition to default fields

blocklistPaths (optional)

Array of path prefixes or RegExp to exclude from logging

ignoreDefaultBlockedPaths (optional)

Boolean to disable default blocked paths (default: false)

debug (optional)

Boolean to show Treblle-related errors in console (default: false)

Using Environment Variables


import { ConfigService } from "@nestjs/config";
 
async function bootstrap() {
  const app = await NestFactory.create(AppModule);
  const configService = app.get(ConfigService);
  const expressInstance = app.getHttpAdapter().getInstance();
 
  useNestTreblle(expressInstance, {
    sdkToken: configService.get("TREBLLE_SDK_TOKEN"),
    apiKey: configService.get("TREBLLE_API_KEY"),
    debug: configService.get("NODE_ENV") !== "production",
  });
 
  await app.listen(3000);
}
 
bootstrap();

Important Notes

Note

Must be called after NestFactory.create() but before app.listen()
Only works with the Express adapter (default NestJS adapter)
For Fastify adapter, consider using the Fastify integration directly

Production-only Setup

Run Treblle only in production:


async function bootstrap() {
  const app = await NestFactory.create(AppModule);
 
  if (process.env.NODE_ENV === "production") {
    const expressInstance = app.getHttpAdapter().getInstance();
 
    useNestTreblle(expressInstance, {
      sdkToken: process.env.TREBLLE_SDK_TOKEN,
      apiKey: process.env.TREBLLE_API_KEY,
    });
  }
 
  await app.listen(3000);
}

Masking Sensitive Data

The following fields are automatically masked:

password, pwd, secret, password_confirmation, passwordConfirmation
cc, card_number, cardNumber, ccv
ssn
credit_score, creditScore

Add custom fields to mask:


useNestTreblle(expressInstance, {
  sdkToken: process.env.TREBLLE_SDK_TOKEN,
  apiKey: process.env.TREBLLE_API_KEY,
  additionalFieldsToMask: ["customSecret", "licensee_key"],
});

Debugging

Enable debug mode to see Treblle errors in your console:


useNestTreblle(expressInstance, {
  sdkToken: process.env.TREBLLE_SDK_TOKEN,
  apiKey: process.env.TREBLLE_API_KEY,
  debug: true,
});

Treblle Docs