## Problem
`generateFrontConfig()` writes `window._env_.REACT_APP_SERVER_BASE_URL =
process.env.SERVER_URL` unconditionally. The frontend then pins to that
absolute URL. For self-hosted deployments reachable from multiple
hostnames (Tailscale IP, LAN IP, internal DNS, SSH tunnel to localhost,
public DNS), only the one matching `SERVER_URL` works — others hit CORS
errors or unreachable hosts because the frontend tries to call the API
at the configured URL, not the one the user came in via.
The frontend already supports the right fallback:
`packages/twenty-front/src/config/index.ts:20-21` reads
`window._env_?.REACT_APP_SERVER_BASE_URL` and falls back to
`getDefaultUrl()` (which uses `window.location`) when the env var is
absent. But the server-side `generateFrontConfig` always populates
`_env_`, so the fallback never runs.
## Fix
One file: `packages/twenty-server/src/utils/generate-front-config.ts`.
Add a `FRONT_AUTO_BASE_URL=true` opt-in (also triggered when
`SERVER_URL` is unset entirely). When the toggle is on, inject
`window._env_ = {}` so the frontend's existing `getDefaultUrl()`
fallback resolves the origin from `window.location` at runtime.
## Backwards compatibility
When `SERVER_URL` is set AND `FRONT_AUTO_BASE_URL` is unset (or anything
other than `'true'`): unchanged — `REACT_APP_SERVER_BASE_URL:
process.env.SERVER_URL` is injected exactly as before.
The toggle is strictly additive. Existing single-hostname deployments
are not affected.
## Use case
Self-hosted Twenty reachable via:
- `http://100.115.12.29` over Tailscale
- `http://localhost:4440` over SSH tunnel
- `http://twenty.internal` over LAN DNS
- `http://crm.example.com` public
With `FRONT_AUTO_BASE_URL=true`, all four paths work without rebuilds or
per-hostname server processes.
## Test plan
- [ ] `SERVER_URL=http://x.com` (toggle unset) → `<script>window._env_ =
{"REACT_APP_SERVER_BASE_URL":"http://x.com"};</script>` (unchanged from
main)
- [ ] `SERVER_URL` unset → `<script>window._env_ = {};</script>` (new
fallback path)
- [ ] `SERVER_URL=http://x.com FRONT_AUTO_BASE_URL=true` →
`<script>window._env_ = {};</script>` (toggle wins)
- [ ] `FRONT_AUTO_BASE_URL=false SERVER_URL=http://x.com` → unchanged
(only `'true'` triggers the toggle)
---------
Co-authored-by: martmull <martmull@hotmail.fr>
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Why Twenty
Twenty gives technical teams the building blocks for a custom CRM that meets complex business needs and quickly adapts as the business evolves. Twenty is the CRM you build, ship, and version like the rest of your stack.
Learn more about why we built Twenty
Installation
Cloud
The fastest way to get started. Sign up at twenty.com and spin up a workspace in under a minute, with no infrastructure to manage and always up to date.
Build an app
Scaffold a new app with the Twenty CLI:
npx create-twenty-app my-app
Define objects, fields, and views as code:
import { defineObject, FieldType } from 'twenty-sdk/define';
export default defineObject({
nameSingular: 'deal',
namePlural: 'deals',
labelSingular: 'Deal',
labelPlural: 'Deals',
fields: [
{ name: 'name', label: 'Name', type: FieldType.TEXT },
{ name: 'amount', label: 'Amount', type: FieldType.CURRENCY },
{ name: 'closeDate', label: 'Close Date', type: FieldType.DATE_TIME },
],
});
Then ship it to your workspace:
npx twenty app:publish --private
See the app development guide for objects, views, agents, and logic functions.
Self-hosting
Run Twenty on your own infrastructure with Docker Compose, or contribute locally via the local setup guide.
Everything you need
Twenty gives you the building blocks of a modern CRM (objects, views, workflows, and agents) and lets you extend them as code. Here's a tour of what's in the box.
Want to go deeper? Read the User Guide for product walkthroughs, or the
Documentation for developer reference.
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Stack
TypeScript
Nx
NestJS, with BullMQ,
PostgreSQL,
Redis
React, with Jotai, Linaria and Lingui
Thanks
Thanks to these amazing services that we use and recommend for UI testing (Chromatic), code review (Greptile), catching bugs (Sentry) and translating (Crowdin).
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