Overview

Complete configuration reference for the Serverless API Gateway. Covers servers, CORS, JWT authorizer, paths, service binding, and wrangler setup.

This guide explains how to configure the Serverless API Gateway with secure practices for different environments.

📁 Configuration Files

Core Configuration Files

• src/api-config.json – Main API configuration

• src/api-config.schema.json – JSON schema for validation

• wrangler.toml – Cloudflare Workers configuration

• wrangler.auth.toml – Authentication-specific configuration (should be gitignored)

• docs/config-examples/*.json – Canonical, schema-validated examples used by tests/docs checks

Environment-Specific Configurations

You can keep separate config files per environment. If you do, validate each one against src/api-config.schema.json before deploy.

🔧 Configuration Templates

Basic API Configuration Template

{
  "$schema": "./api-config.schema.json",
  "title": "Your API Title",
  "description": "Description of your API",
  "cors": {
    "allow_origins": ["https://your-domain.com"],
    "allow_methods": ["GET", "POST", "PUT", "DELETE", "OPTIONS"],
    "allow_headers": ["Content-Type", "Authorization"],
    "expose_headers": ["*"],
    "allow_credentials": true,
    "max_age": 3600
  },
  "paths": [
    {
      "method": "GET",
      "path": "/health",
      "response": { "status": "ok", "version": "1.0.0" }
    },
    {
      "method": "GET",
      "path": "/api/v1/public",
      "response": {
        "message": "This is a public endpoint"
      },
      "auth": false
    }
  ]
}

Supabase Configuration Template

{
  "$schema": "./api-config.schema.json",
  "title": "Supabase API Gateway",
  "description": "API Gateway with Supabase authentication",
  "cors": {
    "allow_origins": ["https://app.example.com"],
    "allow_methods": ["GET", "POST", "PUT", "DELETE", "OPTIONS"],
    "allow_headers": ["*"],
    "expose_headers": ["*"],
    "allow_credentials": true,
    "max_age": 3600
  },
  "authorizer": {
    "type": "supabase",
    "jwt_secret": "$env.SUPABASE_JWT_SECRET",
    "issuer": "https://YOUR_PROJECT_ID.supabase.co/auth/v1",
    "audience": "authenticated"
  },
  "paths": [
    { "method": "GET", "path": "/health", "response": { "status": "ok" } },
    { "method": "POST", "path": "/api/v1/supabase/auth", "integration": { "type": "supabase_passwordless_auth" } },
    { "method": "POST", "path": "/api/v1/supabase/verify", "integration": { "type": "supabase_passwordless_verify" } },
    {
      "method": "GET",
      "path": "/api/v1/protected",
      "response": {
        "status": "success",
        "message": "This is a protected endpoint"
      },
      "auth": true
    }
  ]
}

Auth0 Configuration Template

{
  "$schema": "./api-config.schema.json",
  "title": "Auth0 API Gateway",
  "description": "API Gateway with Auth0 authentication",
  "cors": {
    "allow_origins": ["https://app.example.com"],
    "allow_methods": ["GET", "POST", "PUT", "DELETE", "OPTIONS"],
    "allow_headers": ["*"],
    "expose_headers": ["*"],
    "allow_credentials": true,
    "max_age": 3600
  },
  "authorizer": {
    "type": "auth0",
    "domain": "$env.AUTH0_DOMAIN",
    "client_id": "$env.AUTH0_CLIENT_ID",
    "client_secret": "$secrets.AUTH0_CLIENT_SECRET",
    "redirect_uri": "https://your-api.com/api/v1/auth0/callback",
    "callback_uri": "https://your-api.com/api/v1/auth0/callback-redirect",
    "jwks_uri": "https://your-domain.us.auth0.com/.well-known/jwks.json",
    "scope": "openid profile email"
  },
  "paths": [
    { "method": "GET", "path": "/health", "response": { "status": "ok" } },
    { "method": "GET", "path": "/api/v1/auth0/callback", "integration": { "type": "auth0_callback" } },
    { "method": "GET", "path": "/api/v1/auth0/profile", "integration": { "type": "auth0_userinfo" }, "auth": true },
    {
      "method": "GET",
      "path": "/api/v1/protected",
      "response": {
        "status": "success",
        "message": "This is a protected endpoint"
      },
      "auth": true
    }
  ]
}

Wrangler Configuration Template

# wrangler.toml
name = "your-api-gateway"
main = "src/index.js"
compatibility_date = "2025-01-01"
compatibility_flags = ["nodejs_compat"]
send_metrics = true
minify = true
workers_dev = false

find_additional_modules = true
rules = [
    { type = "ESModule", globs = ["services/*.js"]}
]

# Environment variables (non-sensitive)
[vars]
ENVIRONMENT = "production"
API_VERSION = "1.0.0"
# Add your non-sensitive environment variables here
# SUPABASE_URL = "https://YOUR_PROJECT_ID.supabase.co"
# AUTH0_DOMAIN = "your-domain.us.auth0.com"
# AUTH0_CLIENT_ID = "your_client_id"

# Secrets are set using: wrangler secret put SECRET_NAME

✅ Canonical Examples

Use these files as the source of truth for configuration examples:

• serverlessapigateway/docs/config-examples/minimal.json

• serverlessapigateway/docs/config-examples/auth0.json

• serverlessapigateway/docs/config-examples/supabase.json

Configuration Sections

For detailed documentation on each configuration section, see:

• Servers -- define upstream server aliases and URLs.

• CORS -- configure cross-origin resource sharing policies.

• Authorizer -- set up JWT-based authentication with HS256 or Auth0.

• Paths -- define path-based API routing, methods, and integrations.

• Service Binding -- bind API routes to Cloudflare Worker services.

• Variable Mapping -- transform request headers and query parameters dynamically.