## What kind of change does this PR introduce?
Docs update. Aligns documentation and style guides with the **Sign in /
Sign out / Sign up** platform standard.
Closes DOCS-1328. Related to
[#49874](https://github.com/supabase/supabase/pull/49874).
## What is the current behavior?
Docs style guides prefer _login_ / _log in_. Guide prose uses mixed
login and sign in wording.
## What is the new behavior?
- [WORD_LIST.md](apps/docs/WORD_LIST.md) and
[copywriting.mdx](apps/design-system/content/docs/copywriting.mdx)
document the sign in standard
- Design-system auth examples updated
- Guide prose and API reference spec descriptions updated
### Terminology
**Standard:** Use _sign in_, _sign out_, and _sign up_ as verbs. Use
_sign-in_, _sign-out_, and _sign-up_ as nouns and adjectives. Match
Studio UI labels (**Sign in**, **Sign out**, **Sign up**).
**Preserved intentionally:**
| Category | Keep as-is | Example |
| -------- | ---------- | ------- |
| Feature name | social login | `/social-login`, `features.mdx` heading,
OAuth provider section |
| URL slugs | `login` in paths | `/phone-login`, `/login-flows`,
`choosing-login-flow` |
| CLI | `supabase login` / `supabase logout` | Reference ids
`supabase-login` / `supabase-logout`; executable commands unchanged |
| SDK methods | `logout()` | Kotlin/Swift method names in API reference
titles and examples |
| Third-party UI | Provider product labels | Facebook Login, Kakao
Login, portal **Login** buttons |
| Postgres | Database terminology | login privileges, login credentials,
login via role |
| Audit/logging | Log prose | "Generates the following **log** in the
Postgres Logs" |
| Code and routes | Paths and filenames | `app/login/`, `Login.tsx`,
`demos/android-login` |
| External URLs | Third-party login pages | `dash.cloudflare.com/login`,
`console.neon.tech/login`, `vercel.com/login` |
| API identifiers | Event and field names | Audit actions
`login`/`logout`, `should_logout_user` |
## To test
- Run `pnpm lint:mdx` in `apps/docs`
- Spot-check `features.mdx`, `social-login.mdx`, and a provider guide
(e.g. Facebook, Kakao)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Documentation**
* Standardized authentication terminology across guides, reference
material, CLI documentation, and copywriting guidance using “sign in,”
“sign out,” and “sign up.”
* Updated authentication instructions, headings, link text, examples,
and SSO guidance for clearer, more consistent wording.
* Corrected related grammar, spelling, hyphenation, and documentation
links while preserving established product names and implementation
commands.
* **Style**
* Refined code examples with consistent import ordering and spacing.
* **Examples**
* Updated authentication button and menu labels to “Sign in” and “Sign
out.”
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.
YES
## Problem
The Docs E2E link checker found broken links throughout docs, starting
with `phone-login.mdx` pointing to `/docs/guides/cli/config` (404).
Old links like `/docs/guides/cli/config` still work on the live site
because `supabase.com` has redirects set up for them, but these links
break on the docs preview site, which is what the E2E check tests
against. These issues look clean on the live site, and I didn't catch
them in my first pass because I was testing production instead of the
preview.
The E2E check only tests the ~20 pages a given PR happens to touch, so
fixing the pages it flagged kept exposing more of the same problem one
page at a time as each fix pulled in a new file. To stop chasing this
incrementally, I cross-referenced every `/docs/guides/*` and
`/docs/reference/*` redirect source in `apps/www/lib/redirects.js`
against actual usage across all of `apps/docs`, and verified each
candidate against the live preview.
## Solution
Rather than updating the Docs E2E link checker, this PR resolves the
links. **Why:** we own these docs, so keeping the links clean without
redirects is keeping the house maintained. See [Broken Window
Theory](https://blog.codinghorror.com/the-broken-window-theory/).
Updated every link still using an old path to point straight at the
current page instead of relying on a redirect. This covers old links
like:
- `/docs/guides/cli/config` →
`/docs/guides/local-development/cli/config`
- `/docs/guides/cli/getting-started` →
`/docs/guides/local-development/cli/getting-started`
- `/docs/guides/cli/local-development` →
`/docs/guides/local-development/database-migrations`
- `/docs/guides/cli/managing-environments` →
`/docs/guides/deployment/managing-environments`
- `/docs/guides/cli/seeding-your-database` →
`/docs/guides/local-development/seeding-your-database`
- bare `/docs/guides/cli` → `/docs/guides/local-development`
- `/docs/guides/platform/compute-add-ons` →
`/docs/guides/platform/compute-and-disk`
- `/docs/guides/platform/shared-responsibility-model` →
`/docs/guides/deployment/shared-responsibility-model`
- `/docs/guides/database` → `/docs/guides/database/overview`
- `/docs/reference/javascript`, `/docs/reference/dart`,
`/docs/reference/kotlin`, `/docs/reference/python`,
`/docs/reference/csharp` → their `/introduction` pages (the redirect's
own destination, `/start`, turned out to be dead even on production — a
separate bug in `redirects.js` I didn't touch here)
- and about 35 more of the same pattern, listed in the commit messages
Also fixed a handful of dead heading anchors found along the way (links
that resolve to the right page but point at a `#section` that got
renamed or moved), including the original `#bigquery` anchor and a few
in `connecting-to-postgres.mdx` where content moved to its own dedicated
page.
Left alone on purpose:
- `content/guides/cli.mdx` — this page has no route in the docs app at
all (no `app/guides/cli/` directory), so it 404s even in production
before the `www` redirect ever fires. Fixing its internal link wouldn't
change that; it needs an actual routing/content decision, not a link
fix.
- A few candidates that already resolve fine as-is (`pg_partman`, bare
`/docs/reference/api`, bare `/docs/reference/cli`) — confirmed via curl,
left untouched.
## Manual testing
1. Confirmed every new link target actually exists by checking the
destination file/page and matching heading anchors.
2. Cross-referenced every `/docs/guides/*` and `/docs/reference/*`
redirect source in `apps/www/lib/redirects.js` against real usage in
`apps/docs`, and curl-verified each old path (404) and new path (200)
against the live PR preview before fixing it.
3. Ran the Docs E2E link checker locally against changed pages.
4. Spot-checked the original broken link from CI
(`/docs/guides/cli/config`) to confirm it now points to a working page.
Danny White