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52 lines
3.7 KiB
Plaintext
52 lines
3.7 KiB
Plaintext
---
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title: Overview
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description: Configure the app itself — its identity, default permissions, and what runs at install time.
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icon: screwdriver-wrench
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---
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A Twenty app's **config layer** is what describes the app *to the platform* — its identity, the permissions it holds, and the code that runs during install or upgrade. These declarations don't add new data shapes or runtime behavior; they tell Twenty *who the app is* and *how to set it up*.
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```text
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┌────────────────────────────────────────────────────────┐
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│ Application — identity, default role, variables, │
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│ marketplace metadata │
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│ │
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│ ┌──────────────────────────────────────────────────┐ │
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│ │ Role — what the app's logic functions can read │ │
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│ │ and write (referenced by Application) │ │
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│ └──────────────────────────────────────────────────┘ │
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└────────────────────────────────────────────────────────┘
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│
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▼ (at install / upgrade time)
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┌──────────────────────────────────┐
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│ Pre-install hook │ before metadata migration
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└──────────────────────────────────┘
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┌──────────────────────────────────┐
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│ Post-install hook │ after metadata migration
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└──────────────────────────────────┘
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```
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## In this section
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<CardGroup cols={2}>
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<Card title="Application Config" icon="rocket" href="/l/ru/developers/extend/apps/config/application">
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`defineApplication` — identity, default role, variables, marketplace metadata.
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</Card>
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<Card title="Roles & Permissions" icon="shield-halved" href="/l/ru/developers/extend/apps/config/roles">
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`defineRole` — declare what your app's logic functions can read and write.
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</Card>
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<Card title="Install Hooks" icon="wrench" href="/l/ru/developers/extend/apps/config/install-hooks">
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`definePreInstallLogicFunction` and `definePostInstallLogicFunction` — back up data, seed defaults, validate upgrades.
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</Card>
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</CardGroup>
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## How the pieces relate
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* **Application** is the entry point. Every app has exactly one `defineApplication()` call, and it points at one **Role** as its default.
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* The **Role** controls what the app's logic functions and front components can read and write. Follow least-privilege: only grant the permissions your code actually needs.
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* **Install Hooks** run during install or upgrade — pre-install before the metadata migration (so it can refuse a risky upgrade), post-install after the migration (so it can seed default data against the new schema).
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<Note>
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Install hooks share the [logic function](/l/ru/developers/extend/apps/logic/logic-functions) runtime — same handler signature, same environment variables, same typed API client — but they're declared with their own define functions and live outside the regular trigger model (HTTP, cron, database events).
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</Note>
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