wrangler

Wrangler CLI

Deploy, develop, and manage Cloudflare Workers and associated resources.

FIRST: Verify Wrangler Installation

wrangler --version  # Requires v4.x+

If not installed:

npm install -D wrangler@latest

Key Guidelines

• Use wrangler.jsonc: Prefer JSON config over TOML. Newer features are JSON-only.
• Set compatibility_date: Use a recent date (within 30 days). Check https://developers.cloudflare.com/workers/configuration/compatibility-dates/
• Generate types after config changes: Run wrangler types to update TypeScript bindings.
• Local dev defaults to local storage: Bindings use local simulation unless remote: true.
• Validate config before deploy: Run wrangler check to catch errors early.
• Use environments for staging/prod: Define env.staging and env.production in config.

Quick Start: New Worker

# Initialize new project
npx wrangler init my-worker

# Or with a framework
npx create-cloudflare@latest my-app

Quick Reference: Core Commands

Task	Command
Start local dev server	wrangler dev
Deploy to Cloudflare	wrangler deploy
Deploy dry run	wrangler deploy --dry-run
Generate TypeScript types	wrangler types
Validate configuration	wrangler check
View live logs	wrangler tail
Delete Worker	wrangler delete
Auth status	wrangler whoami

---

Configuration (wrangler.jsonc)

Minimal Config

{
  "$schema": "./node_modules/wrangler/config-schema.json",
  "name": "my-worker",
  "main": "src/index.ts",
  "compatibility_date": "2026-01-01"
}

Full Config with Bindings

{
  "$schema": "./node_modules/wrangler/config-schema.json",
  "name": "my-worker",
  "main": "src/index.ts",
  "compatibility_date": "2026-01-01",
  "compatibility_flags": ["nodejs_compat_v2"],

  // Environment variables
  "vars": {
    "ENVIRONMENT": "production"
  },

  // KV Namespace
  "kv_namespaces": [
    { "binding": "KV", "id": "<KV_NAMESPACE_ID>" }
  ],

  // R2 Bucket
  "r2_buckets": [
    { "binding": "BUCKET", "bucket_name": "my-bucket" }
  ],

  // D1 Database
  "d1_databases": [
    { "binding": "DB", "database_name": "my-db", "database_id": "<DB_ID>" }
  ],

  // Workers AI (always remote)
  "ai": { "binding": "AI" },

  // Vectorize
  "vectorize": [
    { "binding": "VECTOR_INDEX", "index_name": "my-index" }
  ],

  // Hyperdrive
  "hyperdrive": [
    { "binding": "HYPERDRIVE", "id": "<HYPERDRIVE_ID>" }
  ],

  // Durable Objects
  "durable_objects": {
    "bindings": [
      { "name": "COUNTER", "class_name": "Counter" }
    ]
  },

  // Cron triggers
  "triggers": {
    "crons": ["0 * * * *"]
  },

  // Environments
  "env": {
    "staging": {
      "name": "my-worker-staging",
      "vars": { "ENVIRONMENT": "staging" }
    }
  }
}