Catch the error.Review the fix.

The SDK sends the error and its source. Claude writes the patch. You get a pull request.

Join the betaPrivate beta
bugsnack · prod · apilive · sample data
  1. captureTypeError: Cannot read properties of undefined (reading 'cart')
  2. frameat renderCheckout (api/checkout.ts:142:18)
  3. context10 source lines around checkout.ts:142 attached
  4. ingestPOST /api/errors 202 Accepted
  5. analyzeClaude reading stack trace + source…
  6. causeuser.cart read before cart loads on direct visit
  7. githubbranch bugsnack/fix-a3f9c21d pushed
  8. prPull request opened · 1 file changed, +3 −1
  9. emailDiff sent to you for review
Built onNode.jsTypeScriptExpressReactGitHubClaude

The problem

Users find the bug before you do.

  • 01Silent failuresconsole.error lands in a log nobody tails.
  • 02Bare stack tracesFrames, no code. You still have to find the file.
  • 03Manual triageReproduce, read, patch, open the PR. Every time.
  • 04Repeat regressionsSame error next sprint. Nobody wrote down why.
server.tsthe whole setup
import bugsnack from "bugsnack";

bugsnack.init({
  serverUrl: process.env.BUGSNACK_URL,
  apiKey: process.env.BUGSNACK_KEY,
});

10

lines of source above and below each frame go with every error.

Read more →

Most error tools stop at the stack trace. BugSnack reads the source around the failing line, asks Claude for the root cause and a patch, then opens the pull request. You stay the reviewer.

How it works

Error in. Pull request out.

  1. SDK

    01 · Install

    init() with your server URL and key.

  2. Server

    02 · Capture

    Exceptions, rejections, console.error.

  3. Claude

    03 · Analyze

    Trace + source lines → root cause.

  4. GitHub

    04 · Review

    PR on bugsnack/fix-*, diff by email.

The output

The fix arrives as a diff.

Nothing merges without you.

fix: guard cart read before loadbugsnack/fix-a3f9c21d → main · sample
api/checkout.ts+3 −1
  140  export function renderCheckout(user: User) {  141    const items =- 142      user.cart.items;+ 142      user.cart?.items ?? [];+ 143    if (!user.cart) await loadCart(user);  144    return items;
Review changesMerge stays with you

Features

What ships in the beta.

Automatic capture
Uncaught exceptions, unhandled rejections, console.error, capture().
Source-aware analysis
Reads the code around the failing frame, then asks Claude.
React error boundary
Drop-in BugSnackBoundary for render crashes.
Email alerts
SMTP notice when an error is analyzed or a PR opens.
Self-hostable
Your infrastructure, your Anthropic and GitHub keys.

Private beta

Get your first fix PR.

We onboard teams in small batches. Leave your email and we'll reach out.