Stop debugging.
Start building.
return0's AI debugs and analyzes your production code execution in realtime — not already covered by logs — tracking any variables, stack traces, and execution flows to pinpoint root causes instantly.
When You Lack Context & Observability
The worst nightmare: something's broken, but you have no logs, no context, no observability. Whether it's silent failures or missing instrumentation, finding the root cause is impossible without proper visibility.
Debugging Scales with Human Labor
Finding root causes requires analyzing massive amounts of data and patterns that humans struggle with. Each debugging session takes hours of manual detective work, and as your infrastructure grows, you need more engineers doing the same inefficient manual work.
No Logs, No Context, No Clues
Silent failures with no logging, missing instrumentation, or insufficient observability. You're flying blind with no visibility into what's happening in your production environment.
Can't Reproduce the Issue
The issue only happens in production with real users and data. You can't reproduce it locally or in staging, making debugging impossible without direct production access.
AI-Powered Production Debugging That Scales
return0's AI agents automatically investigate and solve production issues without requiring you to reproduce problems or manually debug. Plus, our debugging capabilities scale automatically with your infrastructure.
No More Reproduction
Debug production issues directly where they occur. No need to reproduce problems in staging or local environments - AI investigates with real user data and system state.
Scales Automatically
From 10 to 10,000 services, return0's AI debugging capabilities scale seamlessly. No need to hire more engineers or add debugging infrastructure as your system grows.
Instant Visibility
Access missing runtime context that your existing observability tools didn't capture - variables, execution flow, and system state in real-time without waiting for deployments or release cycles.
Ready to Debug Production Like Never Before?
Join the developers who've eliminated the reproduction step and let AI handle the investigation. Start debugging production applications with confidence at any scale.
How return0 Solves Your Problems
See the transformation from the old way of debugging to the return0 way. We eliminate the reproduction step and let AI handle the investigation.
The Old Way
Hours of Manual Investigation
Spend hours manually investigating, reproducing issues, and analyzing logs. You're doing detective work that could be automated.
Try to Reproduce Locally
Attempt to reproduce the issue in staging or local environments. Often impossible with production-specific data and conditions.
Wait for Deployments
Wait for release cycles, testing, and deployments just to add logging code. By the time you can see what's happening, the issue is gone.
Guess What's Wrong
Make assumptions about what might be causing the issue. No visibility means you're flying blind.
The return0 Way
AI Automatically Investigates
Our AI agents automatically collect runtime context, analyze patterns, and find root causes without any manual intervention.
Debug Production Directly
AI investigates production issues directly where they occur with real user data and system state. No reproduction needed.
Instant Visibility
Get immediate context and observability without waiting for deployments.
Let Data Speak for Itself
No more guessing. AI analyzes the actual runtime data to find the real root cause, not assumptions.
No More Reproduction
Debug production issues directly where they occur with real user data
AI Does the Work
AI automatically investigates and finds root causes - no manual debugging required
Instant Results
Get immediate visibility and context without waiting for deployments
Powerful Features
Everything you need to debug production applications safely and efficiently.
Real-time Debugging
Automatically capture variable values and stack traces in production without restarting your application. Get instant visibility into runtime behavior.
Shadow Mode
Mirror production traffic to a shadow environment for safe debugging. Test fixes without affecting real users.
AI-Powered Root Cause Analysis
When you have no logs, no exceptions, just silent failures - our AI collects runtime context and investigates to find the root cause automatically.
Zero-Logging Context Collection
Collect runtime context even when your application has no logging code. No need to add console.logs or debug statements - we capture everything automatically. Works with distributed systems without redeployments.
Avoid Release Cycles
No more waiting for release cycles, testing, and coordinated deployments across multiple services just to add one line of logging code. Get instant visibility without touching production code.
Skip Issue Reproduction
Eliminate the time-consuming step of reproducing issues in staging or local environments. Debug production issues exactly where they occur with real user data and system state.
When Production Goes Silent
The worst nightmare: something's broken, but there are no logs, no exceptions, no errors. Just silent failures.
The Horror Scenario
Silent Failures
Users report issues, but your monitoring shows no errors, no exceptions, no obvious problems.
Distributed System Constraints
Big distributed systems can't be easily redeployed to add logging code. Release cycles, coordination across services, and deployment complexity make it impractical.
Fail-Forward Only Scenarios
When rollback isn't an option, you need to fix and deploy ASAP. But how do you debug without reproducing the issue first?
return0 Solution
Runtime Context Collection
We collect runtime context even without any existing logging code. No code changes needed, no redeployments needed.
AI-Powered Investigation
Our AI automatically analyzes the runtime context to identify patterns and potential root causes.
Skip Issue Reproduction
Debug production issues directly where they occur. No need to reproduce in staging or local environments.
Don't Let Silent Errors Haunt You
return0 gives you the visibility you need when you need it most.
Skip the reproduction step entirely and debug production issues directly where they occur.
Simple Setup
A simple process to transform how you debug production applications.
Install & Initialize
Add return0 to your Node.js application with a simple npm install and initialization call.
Connect to Broker
Your application connects to the return0 broker server for real-time configuration updates.
AI Running the Show
When issues occur with no logs, our AI automatically collects runtime context and investigates to find root causes.
Monitor & Debug
Watch real-time data flow, capture variable values, and debug issues as they happen.
Architecture Overview
Your Application
Node.js app with return0 SDK
return0 Broker
Real-time configuration & data collection
Dashboard
Web interface for debugging & monitoring
Get Started in Minutes
Set up return0 in your Node.js application with just a few lines of code
Quick Installation
Install the package
npm install return0
Add return0 to your Node.js project
Initialize in your app
import { initializeReturn0 } from 'return0';
await initializeReturn0({
apiKey: 'your-api-key-here'
});Initialize the debugger with your API key
Add Express middleware (optional)
import { return0Middleware } from 'return0';
app.use(return0Middleware);Enable automatic session tracking for Express apps
Resources & Support
Documentation
Complete API reference and guides
GitHub Repository
View source code and contribute
Community
Join our Discord for support
Example: Express.js Integration
// app.js
import express from 'express';
import {
initializeReturn0,
return0Middleware
} from 'return0';
const app = express();
// Initialize return0
await initializeReturn0({
apiKey: process.env.RETURN0_API_KEY
});
// Add middleware for session tracking
app.use(return0Middleware);
// Your routes
app.get('/api/users', (req, res) => {
// This function can now be debugged with tracepoints
const users = getUsers();
res.json({ users });
});
app.listen(3000);Ready to Transform Your Debugging?
Join developers who have reduced debugging time by 80% with return0