Treblle with Express

treblle

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

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

Requirements

Node.js: >=14.0.0
Express: 4.x or 5.x

Installation

npm install treblle@^2.0.0

Don’t forget to load the required modules in your app.js:

const express = require("express");
const { useTreblle } = 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 app.js file:

const express = require("express");
const { useTreblle } = require("treblle");

const app = express();
app.use(express.json());

// Treblle must be registered after body parsing middleware
useTreblle(app, {
  sdkToken: process.env.TREBLLE_SDK_TOKEN,
  apiKey: process.env.TREBLLE_API_KEY,
});

app.get("/api/users", (req, res) => {
  res.json({ users: [] });
});

app.listen(3000);

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

Middleware Ordering

Ensure Treblle is registered after body parsing middleware:

app.use(express.json());        // First: body parsing
app.use(express.urlencoded({ extended: true }));

useTreblle(app, { /* config */ }); // Then: Treblle

// Finally: your routes
app.get('/api/users', handler);

Configuration Options

You can pass additional configuration options:

useTreblle(app, {
  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:

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)

Production-only Setup

Run Treblle only in production:

const app = express();
app.use(express.json());

if (process.env.NODE_ENV === "production") {
  useTreblle(app, {
    sdkToken: process.env.TREBLLE_SDK_TOKEN,
    apiKey: process.env.TREBLLE_API_KEY,
  });
}

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:

useTreblle(app, {
  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:

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