---
search:
  tags:
    - Operations
    - GET
seo:
  description: >-
    Owner-only. Use this after a deploy to see whether the iframe surfaced
    runtime errors.… Reference for the GET /app/{id}/diag endpoint in the
    Charming API API.
sidebar:
  badge: GET
  label: Read the per-app runtime error ring buffer
title: Read the per-app runtime error ring buffer
type: openapi-operation
---
Owner-only. Use this after a deploy to see whether the iframe surfaced runtime errors. 50-entry ring buffer; oldest entries roll off. Accepts `renderToken` so the in-page shell can fetch its own diag without cookies.

<Operation source="reference" id="get-app-diag" />

Found a bug or need a feature? [Tell us](/docs/capabilities/feedback) with `submit_feedback` or `POST /app/{id}/feedback`. Your feedback shapes what we build next.