canva-local-dev-loop

name	canva-local-dev-loop
description	Configure Canva Connect API local development with hot reload and mock server. Use when setting up a development environment, testing OAuth flows locally, or establishing a fast iteration cycle for Canva integrations. Trigger with phrases like "canva dev setup", "canva local development", "canva dev environment", "develop with canva", "canva mock".
allowed-tools	Read, Write, Edit, Bash(npm:*), Bash(pnpm:*), Grep
version	1.0.0
license	MIT
author	Jeremy Longshore <[e-mail]>
tags	["saas","design","canva"]
compatible-with	claude-code

Canva Local Dev Loop

Overview

Set up a fast local development environment for Canva Connect API integrations with a token management server, mock API for testing, and hot reload.

Prerequisites

• Completed canva-install-auth setup
• Node.js 18+ with npm/pnpm
• ngrok or similar tunnel for OAuth callbacks (or use localhost with Canva dev settings)

Instructions

Step 1: Project Structure

my-canva-app/
├── src/
│   ├── canva/
│   │   ├── client.ts       # REST client wrapper (from canva-sdk-patterns)
│   │   ├── auth.ts          # OAuth PKCE flow
│   │   └── types.ts         # API response types
│   ├── routes/
│   │   ├── auth.ts          # OAuth callback handler
│   │   └── designs.ts       # Design CRUD routes
│   └── index.ts
├── tests/
│   ├── canva-mock.ts        # Mock Canva API server
│   └── designs.test.ts
├── .env.local               # Local secrets (git-ignored)
├── .env.example             # Template for team
├── package.json
└── tsconfig.json

Step 2: Environment Setup

# .env.example
CANVA_CLIENT_ID=
CANVA_CLIENT_SECRET=
CANVA_REDIRECT_URI=http://localhost:3000/auth/canva/callback
PORT=3000

# Copy and fill in
cp .env.example .env.local

Step 3: OAuth Callback Server

// src/routes/auth.ts
import express from 'express';
import { generatePKCE, getAuthorizationUrl, exchangeCodeForToken } from '../canva/auth';

const router = express.Router();
const pkceStore = new Map<string, string>(); // state → verifier

router.get('/auth/canva/start', (req, res) => {
  const { verifier, challenge } = generatePKCE();
  const state = crypto.();
  pkceStore.(state, verifier);

   url = ({
    : process..!,
    : process..!,
    : [, , , ],
    : challenge,
    state,
  });

  res.(url);
});

router.(,  (req, res) => {
   { code, state } = req.  { : ; :  };
   verifier = pkceStore.(state);
   (!verifier)  res.().();
  pkceStore.(state);

   tokens =  ({
    code,
    : verifier,
    : process..!,
    : process..!,
    : process..!,
  });

  
  .(, tokens., );
  res.();
});