# Put an application in a service

`POST https://evohub.io/api/v1/catalog/applications/{id}/component`

Part of the [Catalog API](https://docs.evohub.io/catalog.md) reference · operationId `bindApplication`.

Binds the application, and every member now and as members come and
go, to a service (`{"component": "<id or slug>"}`), or unbinds it
(`{"component": null}`). A member bound on its own, by its annotation
or by hand, keeps its own binding.

Requires the `catalog:resource:write` scope.

## Authorization

Any one of:

- `bearerKey`
- `headerKey`

Where:

- `bearerKey`: HTTP Bearer — An EvoHub API key (`evohub_…`) as a bearer token.
- `headerKey`: API key in the header `X-API-Key` — An EvoHub API key (`evohub_…`).

## Path parameters

- `id` (string, required, example `app_9c1e3a5b7d9f2b4d6f8a0c2e4b6d8f1a`): The application's ID.

## Request body (required)

Content type: `application/json`

Type: `BindRequest`

- `component` (string | null, required): A service's ID or slug, or null to unbind.

## Responses

### 200 — The application.

Content type: `application/json`

Type: `object`

- `data` (Application)
  - `id` (string)
  - `environment_id` (string)
  - `namespace` (string)
  - `provider` (string)
  - `key_source` (string): What grouped it, such as an Argo CD application or a Helm release.
  - `key` (string)
  - `name` (string)
  - `component_id` (string | null)
  - `component_bound_by` (string | null)
  - `owner_hint` (string | null): The team its `evohub.io/team`, `team` or `owner` label names.
  - `status` (string, one of `live`, `missing`, `gone`)
  - `members` (integer)
  - `by_status` (object)
    - Other keys: integer
  - `kinds` (object)
    - Other keys: integer
  - `images` (array of string)
  - `health` (Health, one of `healthy`, `degraded`, `down`, `idle`, `unknown`)
  - `ready` (integer)
  - `desired` (integer)
  - `first_seen_at` (string (date-time))
  - `last_seen_at` (string (date-time))

### 400 — The request is not valid: a field or filter value is wrong (`VALIDATION_ERROR`, with a sentence saying what), the body is not the expected JSON or carries an unknown field (`INVALID_BODY`), the cursor is not one this list gave (`INVALID_CURSOR`), a binding names a service that does not exist (`UNKNOWN_COMPONENT`), or a `PATCH` tries to change a slug (`SLUG_IMMUTABLE`).

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required, example `NOT_FOUND`)
  - `message` (string, required, example `not found`)
  - `request_id` (string)

### 401 — No API key was sent, or it is unknown, revoked or expired (`UNAUTHORIZED`).

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required, example `NOT_FOUND`)
  - `message` (string, required, example `not found`)
  - `request_id` (string)

### 403 — The key lacks a scope this endpoint needs (`FORBIDDEN`).

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required, example `NOT_FOUND`)
  - `message` (string, required, example `not found`)
  - `request_id` (string)

### 404 — Nothing with this ID (or slug) exists in the organization (`NOT_FOUND`).

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required, example `NOT_FOUND`)
  - `message` (string, required, example `not found`)
  - `request_id` (string)

### 429 — Too many requests (`RATE_LIMITED`). Wait for `Retry-After` seconds.

Headers:

- `Retry-After` (integer): Seconds to wait before retrying.

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required, example `NOT_FOUND`)
  - `message` (string, required, example `not found`)
  - `request_id` (string)

### 500 — Something went wrong on EvoHub's side (`INTERNAL_ERROR`). Retry later.

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required, example `NOT_FOUND`)
  - `message` (string, required, example `not found`)
  - `request_id` (string)

## Example request

```bash
curl -X POST 'https://evohub.io/api/v1/catalog/applications/app_9c1e3a5b7d9f2b4d6f8a0c2e4b6d8f1a/component' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <TOKEN>' \
  -d '{
  "component": "cmp_7a1d3f5b9c2e4a6b8d0f1e3c5a7b9d2f"
}'
```