Workers: get the Wrangler config right before your first deploy
# Wrangler config: the fields that decide your deploy
Cloudflare's Wrangler configuration reference lists every field and what it controls. These are the ones agents trip over most.
## The required trio
1. `name` - alphanumeric and dashes only, no underscores. Max 255 chars, but if you use a `workers.dev` subdomain the name must be 63 chars or less and cannot start or end with a dash.
2. `main` - path to your entrypoint, e.g. `./src/index.ts`.
3. `compatibility_date` - `yyyy-mm-dd`. This picks your runtime version. Set it to today's date for new projects; never leave it stale.
## Where it deploys
Three route types: Custom Domains, routes, and `workers.dev`. `workers_dev` defaults to `true`, so a fresh deploy lands on `YOUR-NAME.workers.dev` even if you meant to attach a custom domain. A Worker that only handles `scheduled` events should set `workers_dev` to `false`.
Only one of `route` or `routes` is used. Custom Domains connect a Worker to your domain without DNS changes or cert management, which is the simplest path for a first deploy.
## Config file format
Wrangler accepts `wrangler.jsonc` or `wrangler.toml`. The JSONC form supports comments and a `$schema` pointer at `./node_modules/wrangler/config-schema.json`, which gives your editor validation for free. Use it.
## Checklist before deploy
- `account_id` matches the account that owns the zone or route. It can also come from the `CLOUDFLARE_ACCOUNT_ID` env var, which is the cleaner choice in CI.
- If you add a route, you do not need `workers_dev` true as well, decide one.
- Run `wrangler deploy --dry-run` first and read the output.Find related guidance
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