Wrangler

Wrangler CLI

Your knowledge of Wrangler CLI flags, config fields, and subcommands may be outdated. Prefer retrieval over pre-training for any Wrangler task.

Retrieval Sources

Fetch the latest information before writing or reviewing Wrangler commands and config. Do not rely on baked-in knowledge for CLI flags, config fields, or binding shapes.

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.
• Profile Worker startup: Run wrangler check startup to measure startup time and detect scripts that exceed the startup time limit.
• 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

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"],

  // 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" }
    }
  }
}

Generate Types from Config

# Generate worker-configuration.d.ts
wrangler types

# Custom output path
wrangler types ./src/env.d.ts

# Check types are up to date (CI)
wrangler types --check

Local Development

Start Dev Server

# Local mode (default) - uses local storage simulation
wrangler dev

# With specific environment
wrangler dev --env staging

# Force local-only (disable remote bindings)
wrangler dev --local

# Remote mode - runs on Cloudflare edge (legacy)
wrangler dev --remote

# Custom port
wrangler dev --port 8787

# Live reload for HTML changes
wrangler dev --live-reload

# Test scheduled/cron handlers
wrangler dev --test-scheduled
# Then visit: http://localhost:8787/__scheduled

Remote Bindings for Local Dev

Use remote: true in binding config to connect to real resources while running locally:

{
  "r2_buckets": [
    { "binding": "BUCKET", "bucket_name": "my-bucket", "remote": true }
  ],
  "ai": { "binding": "AI", "remote": true },
  "vectorize": [
    { "binding": "INDEX", "index_name": "my-index", "remote": true }
  ]
}

Recommended remote bindings: AI (required), Vectorize, Browser Rendering, mTLS, Images.

Local Secrets

Create .dev.vars for local development secrets:

API_KEY=local-dev-key
DATABASE_URL=postgres://localhost:5432/dev

Deployment

Deploy Worker

# Deploy to production
wrangler deploy

# Deploy specific environment
wrangler deploy --env staging

# Dry run (validate without deploying)
wrangler deploy --dry-run

# Keep dashboard-set variables
wrangler deploy --keep-vars

# Minify code
wrangler deploy --minify

Manage Secrets

# Set secret interactively
wrangler secret put API_KEY

# Set from stdin
echo "secret-value" | wrangler secret put API_KEY

# List secrets
wrangler secret list

# Delete secret
wrangler secret delete API_KEY

# Bulk secrets from JSON file
wrangler secret bulk secrets.json

Versions and Rollback

# List recent versions
wrangler versions list

# View specific version
wrangler versions view <VERSION_ID>

# Rollback to previous version
wrangler rollback

# Rollback to specific version
wrangler rollback <VERSION_ID>

KV (Key-Value Store)

Manage Namespaces

# Create namespace
wrangler kv namespace create MY_KV

# List namespaces
wrangler kv namespace list

# Delete namespace
wrangler kv namespace delete --namespace-id <ID>

Manage Keys

# Put value
wrangler kv key put --namespace-id <ID> "key" "value"

# Put with expiration (seconds)
wrangler kv key put --namespace-id <ID> "key" "value" --expiration-ttl 3600

# Get value
wrangler kv key get --namespace-id <ID> "key"

# List keys
wrangler kv key list --namespace-id <ID>

# Delete key
wrangler kv key delete --namespace-id <ID> "key"

# Bulk put from JSON
wrangler kv bulk put --namespace-id <ID> data.json

Config Binding

{
  "kv_namespaces": [
    { "binding": "CACHE", "id": "<NAMESPACE_ID>" }
  ]
}

R2 (Object Storage)

Manage Buckets

# Create bucket
wrangler r2 bucket create my-bucket

# Create with location hint
wrangler r2 bucket create my-bucket --location wnam

# List buckets
wrangler r2 bucket list

# Get bucket info
wrangler r2 bucket info my-bucket

# Delete bucket
wrangler r2 bucket delete my-bucket

Manage Objects

# Upload object
wrangler r2 object put my-bucket/path/file.txt --file ./local-file.txt

# Download object
wrangler r2 object get my-bucket/path/file.txt

# Delete object
wrangler r2 object delete my-bucket/path/file.txt

Config Binding

{
  "r2_buckets": [
    { "binding": "ASSETS", "bucket_name": "my-bucket" }
  ]
}

D1 (SQL Database)

Manage Databases

# Create database
wrangler d1 create my-database

# Create with location
wrangler d1 create my-database --location wnam

# List databases
wrangler d1 list

# Get database info
wrangler d1 info my-database

# Delete database
wrangler d1 delete my-database

Execute SQL

# Execute SQL command (remote)
wrangler d1 execute my-database --remote --command "SELECT * FROM users"

# Execute SQL file (remote)
wrangler d1 execute my-database --remote --file ./schema.sql

# Execute locally
wrangler d1 execute my-database --local --command "SELECT * FROM users"

Migrations

# Create migration
wrangler d1 migrations create my-database create_users_table

# List pending migrations
wrangler d1 migrations list my-database --local

# Apply migrations locally
wrangler d1 migrations apply my-database --local

# Apply migrations to remote
wrangler d1 migrations apply my-database --remote

Export/Backup

# Export schema and data
wrangler d1 export my-database --remote --output backup.sql

# Export schema only
wrangler d1 export my-database --remote --output schema.sql --no-data

Config Binding

{
  "d1_databases": [
    {
      "binding": "DB",
      "database_name": "my-database",
      "database_id": "<DATABASE_ID>",
      "migrations_dir": "./migrations"
    }
  ]
}

Vectorize (Vector Database)

Manage Indexes

# Create index with dimensions
wrangler vectorize create my-index --dimensions 768 --metric cosine

# Create with preset (auto-configures dimensions/metric)
wrangler vectorize create my-index --preset @cf/baai/bge-base-en-v1.5

# List indexes
wrangler vectorize list

# Get index info
wrangler vectorize get my-index

# Delete index
wrangler vectorize delete my-index

Manage Vectors

# Insert vectors from NDJSON file
wrangler vectorize insert my-index --file vectors.ndjson

# Query vectors
wrangler vectorize query my-index --vector "[0.1, 0.2, ...]" --top-k 10

Config Binding

{
  "vectorize": [
    { "binding": "SEARCH_INDEX", "index_name": "my-index" }
  ]
}

Hyperdrive (Database Accelerator)

Manage Configs

# Create config
wrangler hyperdrive create my-hyperdrive \
  --connection-string "postgres://user:pass@host:5432/database"

# List configs
wrangler hyperdrive list

# Get config details
wrangler hyperdrive get <HYPERDRIVE_ID>

# Update config
wrangler hyperdrive update <HYPERDRIVE_ID> --origin-password "new-password"

# Delete config
wrangler hyperdrive delete <HYPERDRIVE_ID>

Config Binding

{
  "compatibility_flags": ["nodejs_compat"],
  "hyperdrive": [
    { "binding": "HYPERDRIVE", "id": "<HYPERDRIVE_ID>" }
  ]
}

Workers AI

List Models

# List available models
wrangler ai models

# List finetunes
wrangler ai finetune list

Config Binding

{
  "ai": { "binding": "AI" }
}

Note: Workers AI always runs remotely and incurs usage charges even in local dev.

Queues

Manage Queues

# Create queue
wrangler queues create my-queue

# List queues
wrangler queues list

# Delete queue
wrangler queues delete my-queue

# Add consumer to queue
wrangler queues consumer add my-queue my-worker

# Remove consumer
wrangler queues consumer remove my-queue my-worker

Config Binding

{
  "queues": {
    "producers": [
      { "binding": "MY_QUEUE", "queue": "my-queue" }
    ],
    "consumers": [
      {
        "queue": "my-queue",
        "max_batch_size": 10,
        "max_batch_timeout": 30
      }
    ]
  }
}

Containers

Build and Push Images

# Build container image
wrangler containers build -t my-app:latest .

# Build and push in one command
wrangler containers build -t my-app:latest . --push

# Push existing image to Cloudflare registry
wrangler containers push my-app:latest

Manage Containers

# List containers
wrangler containers list

# Get container info
wrangler containers info <CONTAINER_ID>

# Delete container
wrangler containers delete <CONTAINER_ID>

Manage Images

# List images in registry
wrangler containers images list

# Delete image
wrangler containers images delete my-app:latest

Manage External Registries

# List configured registries
wrangler containers registries list

# Configure external registry (e.g., ECR)
wrangler containers registries configure <DOMAIN> \
  --public-credential <AWS_ACCESS_KEY_ID>

# Delete registry configuration
wrangler containers registries delete <DOMAIN>

Workflows

Manage Workflows

# List workflows
wrangler workflows list

# Describe workflow
wrangler workflows describe my-workflow

# Trigger workflow instance
wrangler workflows trigger my-workflow

# Trigger with parameters
wrangler workflows trigger my-workflow --params '{"key": "value"}'

# Delete workflow
wrangler workflows delete my-workflow

Manage Workflow Instances

# List instances
wrangler workflows instances list my-workflow

# Describe instance
wrangler workflows instances describe my-workflow <INSTANCE_ID>

# Terminate instance
wrangler workflows instances terminate my-workflow <INSTANCE_ID>

Config Binding

{
  "workflows": [
    {
      "binding": "MY_WORKFLOW",
      "name": "my-workflow",
      "class_name": "MyWorkflow"
    }
  ]
}

Pipelines

Manage Pipelines

# Create pipeline
wrangler pipelines create my-pipeline --r2 my-bucket

# List pipelines
wrangler pipelines list

# Show pipeline details
wrangler pipelines show my-pipeline

# Update pipeline
wrangler pipelines update my-pipeline --batch-max-mb 100

# Delete pipeline
wrangler pipelines delete my-pipeline

Config Binding

{
  "pipelines": [
    { "binding": "MY_PIPELINE", "pipeline": "my-pipeline" }
  ]
}

Secrets Store

Manage Stores

# Create store
wrangler secrets-store store create my-store

# List stores
wrangler secrets-store store list

# Delete store
wrangler secrets-store store delete <STORE_ID>

Manage Secrets in Store

# Add secret to store
wrangler secrets-store secret put <STORE_ID> my-secret

# List secrets in store
wrangler secrets-store secret list <STORE_ID>

# Get secret
wrangler secrets-store secret get <STORE_ID> my-secret

# Delete secret from store
wrangler secrets-store secret delete <STORE_ID> my-secret

Config Binding

{
  "secrets_store_secrets": [
    {
      "binding": "MY_SECRET",
      "store_id": "<STORE_ID>",
      "secret_name": "my-secret"
    }
  ]
}

Pages (Frontend Deployment)

# Create Pages project
wrangler pages project create my-site

# Deploy directory to Pages
wrangler pages deploy ./dist

# Deploy with specific branch
wrangler pages deploy ./dist --branch main

# List deployments
wrangler pages deployment list --project-name my-site

Observability

Tail Logs

# Stream live logs
wrangler tail

# Tail specific Worker
wrangler tail my-worker

# Filter by status
wrangler tail --status error

# Filter by search term
wrangler tail --search "error"

# JSON output
wrangler tail --format json

Config Logging

{
  "observability": {
    "enabled": true,
    "head_sampling_rate": 1
  }
}

Testing

Local Testing with Vitest

npm install -D @cloudflare/vitest-pool-workers vitest

vitest.config.ts:

import { defineWorkersConfig } from "@cloudflare/vitest-pool-workers/config";

export default defineWorkersConfig({
  test: {
    poolOptions: {
      workers: {
        wrangler: { configPath: "./wrangler.jsonc" },
      },
    },
  },
});

Test Scheduled Events

# Enable in dev
wrangler dev --test-scheduled

# Trigger via HTTP
curl http://localhost:8787/__scheduled

Troubleshooting

Common Issues

Debug Commands

# Check auth status
wrangler whoami

# Profile Worker startup time
wrangler check startup

# View config schema
wrangler docs configuration

Best Practices

1. Version control wrangler.jsonc: Treat as source of truth for Worker config.
2. Use automatic provisioning: Omit resource IDs for auto-creation on deploy.
3. Run wrangler types in CI: Add to build step to catch binding mismatches.
4. Use environments: Separate staging/production with env.staging, env.production.
5. Set compatibility_date: Update quarterly to get new runtime features.
6. Use .dev.vars for local secrets: Never commit secrets to config.
7. Test locally first: wrangler dev with local bindings before deploying.
8. Use --dry-run before major deploys: Validate changes without deployment.