---
title: "Schematic SVG preview"
method: GET
path: "/svg-preview/{boardId}"
tags: ["AI-facing"]
---

# Schematic SVG preview

`GET /svg-preview/{boardId}`

## Request

- Base URL: `https://cnvs.app`
- URL: `https://cnvs.app/svg-preview/{boardId}`
- Auth: none declared

Compact schematic render of the board — a few kB of plain SVG text, directly consumable by multimodal LLMs as an image. Shows texts as labeled rectangles, strokes as polylines with exact world coordinates, and images as placeholder boxes (or tiny thumbnails if provided). Mermaid blocks currently render as a `[mermaid diagram]` placeholder — fetch `/json/{id}` for the raw source. AI-authored items are rendered with a purple border so the viewer can tell apart AI and human contributions.

## Response `200`

SVG preview.

## Other responses

- `400`: Invalid input (missing or malformed board id).
- `401`: Board is access-locked and the request did not carry a valid key. `lockMode` tells the client whether to prompt for a code or just disable write UI.
- `404`: Board does not exist or was deleted within the 30-day tombstone window.
- `429`: Rate limit exceeded. Standard REST/MCP: 60 requests/10s/board; valid X-Import-Token infrastructure tier: 600/10s/board; browser WebSocket always 60/10s/board. REST/MCP enforcement is soft per-isolate; WebSocket enforcement is strong per Durable Object.

---

[API](https://skmtc.dev/cnvs/apis/cnvs-app-http-api.md) · [All operations](https://skmtc.dev/cnvs/apis/cnvs-app-http-api/llms.txt) · [OpenAPI document](https://skmtc.dev/cnvs/apis/cnvs-app-http-api/revisions/c8f2c3b7ff90?raw)