Posted on Jun 26 • Originally published at thinkthroo.com

What is wrangler.jsonc file in 0.email codebase?

#wrangler #cloudflarechallenge #react #opensource

In this article, we will review What is wrangler.jsonc file in 0.email codebase? We will look at:

wrangler.jsonc file in 0.email
start script in package.json
What is Wrangler?

wrangler.jsonc file in 0.email

So at zero/apps/mail/wrangler.jsonc, you will find the below code:

{ "$schema": "node_modules/wrangler/config-schema.json", "name": "zero", "compatibility_date": "2025-05-01", "compatibility_flags": ["nodejs_compat"], "main": "./worker.ts", "observability": { "enabled": true, }, "env": { "local": { "vars": { "VITE_PUBLIC_BACKEND_URL": "http://localhost:8787", "VITE_PUBLIC_APP_URL": "http://localhost:3000", }, }, "staging": { "vars": { "VITE_PUBLIC_BACKEND_URL": "https://sapi.0.email", "VITE_PUBLIC_APP_URL": "https://staging.0.email", }, }, "production": { "vars": { "VITE_PUBLIC_BACKEND_URL": "https://api.0.email", "VITE_PUBLIC_APP_URL": "https://0.email", }, }, }, }

`start` script in package.json

In zero/apps/mail/package.json, you will find the below script:

"start": "wrangler dev --port 3000 --show-interactive-dev-session=false",

Here, Wrangler is used to start this 0.mail frontend.

"types": "wrangler types", "deploy": "wrangler deploy",

Similarly, there is also a script for types and deploy.

What is Wrangler?

Wrangler, the Cloudflare Developer Platform command-line interface (CLI), allows you to manage Worker projects.

API : A set of programmatic APIs that can be integrated with local Cloudflare Workers-related workflows.
Bundling : Review Wrangler’s default bundling.
Commands : Create, develop, and deploy your Cloudflare Workers with Wrangler commands.
Configuration : Use a configuration file to customize the development and deployment setup for your Worker project and other Developer Platform products.
Custom builds : Customize how your code is compiled, before being processed by Wrangler.
Deprecations : The differences between Wrangler versions, specifically deprecations and breaking changes.
Environments : Use environments to create different configurations for the same Worker application.
Install/Update Wrangler : Get started by installing Wrangler, and update to newer versions by following this guide.
Migrations : Review migration guides for specific versions of Wrangler.
System environment variables : Local environment variables that can change Wrangler’s behavior.