---
title: "Not Found and Errors - Air Market"
description: "Visitors will hit URLs that do not exist and pages that throw, and by default that looks bad. This covers marking something as not found, choosing what renders when it happens and where in the tree i…"
canonical: "https://airmarket.ai/app/not-found-and-errors"
---

[Air Market](/) / [Developer Tools](/category/devtools) / Not Found and Errors

Skill by [TanStack](/@tanstack)

# Not Found and Errors

Decide what a visitor sees when the page is missing or breaks

## What this does

Visitors will hit URLs that do not exist and pages that throw, and by default that looks bad. This covers marking something as not found, choosing what renders when it happens and where in the tree it shows, and catching errors so one broken piece does not blank the screen. It also covers showing a tidier URL than the route actually being rendered.

### Top 3 things it does for you

- Show a not-found page for a bad URL
- Catch an error without taking down the whole app
- Choose whether not-found shows in place or at the root

## Information

**Not Found and Errors at a glance**

|  |  |
| --- | --- |
| Kind | Skill |
| Publisher | [TanStack](/@tanstack) |
| Category | [Developer Tools](/category/devtools) |
| Works with | Agent Skills - an open standard supported by 40+ agents |
| Size | 11 KB |
| Licence | MIT |
| Repository | [TanStack/router](https://github.com/TanStack/router/tree/179d9b9b5eec50dc7833b4e2ef91b735d34bbc07/packages/router-core/skills/router-core/not-found-and-errors) |
| GitHub stars | 14,984 (as of Nov 2026) |

## Security report

**Verified.** AIR scanned this exact version of Not Found and Errors and flagged nothing. AIR's verdict: **safe**.

**What Not Found and Errors's check was run against**

|  |  |
| --- | --- |
| Commit | 179d9b9b5eec50dc7833b4e2ef91b735d34bbc07 |
| Content hash | 499f9edfa29498f277d8a78ea194ff15df6133bacd3bba8f70dc6eac21644fa1 |
| Files read | [Browse the files at this exact commit](https://github.com/TanStack/router/blob/179d9b9b5eec50dc7833b4e2ef91b735d34bbc07/packages/router-core/skills/router-core/not-found-and-errors/SKILL.md) |

A scan is named by the exact content it read, not by a version number. A different version is a different artifact, and nothing here applies to a version AIR has not scanned.

[Read the full security report for Not Found and Errors](/security/not-found-and-errors)

## About Not Found and Errors

The notFound() function with notFoundComponent, defaultNotFoundComponent and notFoundMode for choosing between fuzzy and root placement, plus the isNotFound check and the deprecated NotFoundRoute.

Covers error handling with errorComponent, CatchBoundary and CatchNotFound.

Also covers route masking through the mask option, createRouteMask and unmaskOnReload.

## What's inside

- SKILL.md - instructions

## Questions

### Is Not Found and Errors safe to install?

AIR scanned this exact version of Not Found and Errors and flagged nothing. AIR's verdict: safe. The verdict is named by the content that was read, at commit 179d9b9b5eec, so it cannot drift onto a version nobody scanned. The full report is at https://airmarket.ai/security/not-found-and-errors.

### How do I install Not Found and Errors?

Open https://airmarket.ai/app/not-found-and-errors on Air Market and use the install action: Air Market hands Claude a prompt naming this exact skill, and Claude sets it up. Source, pinned to the exact commit this listing describes: https://github.com/TanStack/router/tree/179d9b9b5eec50dc7833b4e2ef91b735d34bbc07/packages/router-core/skills/router-core/not-found-and-errors. Install from that link, not the branch.

## Related on Air Market

- [More Developer Tools listings](/category/devtools)
- [Everything by TanStack](/@tanstack)

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Canonical URL: <https://airmarket.ai/app/not-found-and-errors>