# Class: ConnectionError

Error thrown when a connection or network operation fails. Use for database pool errors, API failures, timeouts, etc.

## Example[​](#example "Direct link to Example")

```typescript
throw new ConnectionError("Query failed", { cause: pgError });
throw new ConnectionError("No response received from SQL Warehouse API");

```

## Extends[​](#extends "Direct link to Extends")

* [`AppKitError`](./docs/api/appkit/Class.AppKitError.md)

## Constructors[​](#constructors "Direct link to Constructors")

### Constructor[​](#constructor "Direct link to Constructor")

```ts
new ConnectionError(message: string, options?: {
  cause?: Error;
  context?: Record<string, unknown>;
}): ConnectionError;

```

#### Parameters[​](#parameters "Direct link to Parameters")

| Parameter          | Type                                                              |
| ------------------ | ----------------------------------------------------------------- |
| `message`          | `string`                                                          |
| `options?`         | { `cause?`: `Error`; `context?`: `Record`<`string`, `unknown`>; } |
| `options.cause?`   | `Error`                                                           |
| `options.context?` | `Record`<`string`, `unknown`>                                     |

#### Returns[​](#returns "Direct link to Returns")

`ConnectionError`

#### Inherited from[​](#inherited-from "Direct link to Inherited from")

[`AppKitError`](./docs/api/appkit/Class.AppKitError.md).[`constructor`](./docs/api/appkit/Class.AppKitError.md#constructor)

## Properties[​](#properties "Direct link to Properties")

### cause?[​](#cause "Direct link to cause?")

```ts
readonly optional cause: Error;

```

Optional cause of the error

#### Inherited from[​](#inherited-from-1 "Direct link to Inherited from")

[`AppKitError`](./docs/api/appkit/Class.AppKitError.md).[`cause`](./docs/api/appkit/Class.AppKitError.md#cause)

***

### code[​](#code "Direct link to code")

```ts
readonly code: "CONNECTION_ERROR" = "CONNECTION_ERROR";

```

Error code for programmatic error handling

#### Overrides[​](#overrides "Direct link to Overrides")

[`AppKitError`](./docs/api/appkit/Class.AppKitError.md).[`code`](./docs/api/appkit/Class.AppKitError.md#code)

***

### context?[​](#context "Direct link to context?")

```ts
readonly optional context: Record<string, unknown>;

```

Additional context for the error

#### Inherited from[​](#inherited-from-2 "Direct link to Inherited from")

[`AppKitError`](./docs/api/appkit/Class.AppKitError.md).[`context`](./docs/api/appkit/Class.AppKitError.md#context)

***

### isRetryable[​](#isretryable "Direct link to isRetryable")

```ts
readonly isRetryable: true = true;

```

Whether this error type is generally safe to retry

#### Overrides[​](#overrides-1 "Direct link to Overrides")

[`AppKitError`](./docs/api/appkit/Class.AppKitError.md).[`isRetryable`](./docs/api/appkit/Class.AppKitError.md#isretryable)

***

### statusCode[​](#statuscode "Direct link to statusCode")

```ts
readonly statusCode: 503 = 503;

```

HTTP status code suggestion (can be overridden)

#### Overrides[​](#overrides-2 "Direct link to Overrides")

[`AppKitError`](./docs/api/appkit/Class.AppKitError.md).[`statusCode`](./docs/api/appkit/Class.AppKitError.md#statuscode)

## Methods[​](#methods "Direct link to Methods")

### toJSON()[​](#tojson "Direct link to toJSON()")

```ts
toJSON(): Record<string, unknown>;

```

Convert error to JSON for logging/serialization. Sensitive values in context are automatically redacted.

#### Returns[​](#returns-1 "Direct link to Returns")

`Record`<`string`, `unknown`>

#### Inherited from[​](#inherited-from-3 "Direct link to Inherited from")

[`AppKitError`](./docs/api/appkit/Class.AppKitError.md).[`toJSON`](./docs/api/appkit/Class.AppKitError.md#tojson)

***

### toString()[​](#tostring "Direct link to toString()")

```ts
toString(): string;

```

Create a human-readable string representation

#### Returns[​](#returns-2 "Direct link to Returns")

`string`

#### Inherited from[​](#inherited-from-4 "Direct link to Inherited from")

[`AppKitError`](./docs/api/appkit/Class.AppKitError.md).[`toString`](./docs/api/appkit/Class.AppKitError.md#tostring)

***

### apiFailure()[​](#apifailure "Direct link to apiFailure()")

```ts
static apiFailure(service: string, cause?: Error): ConnectionError;

```

Create a connection error for API failures

#### Parameters[​](#parameters-1 "Direct link to Parameters")

| Parameter | Type     |
| --------- | -------- |
| `service` | `string` |
| `cause?`  | `Error`  |

#### Returns[​](#returns-3 "Direct link to Returns")

`ConnectionError`

***

### clientUnavailable()[​](#clientunavailable "Direct link to clientUnavailable()")

```ts
static clientUnavailable(clientType: string, hint?: string): ConnectionError;

```

Create a connection error for client unavailable

#### Parameters[​](#parameters-2 "Direct link to Parameters")

| Parameter    | Type     |
| ------------ | -------- |
| `clientType` | `string` |
| `hint?`      | `string` |

#### Returns[​](#returns-4 "Direct link to Returns")

`ConnectionError`

***

### poolError()[​](#poolerror "Direct link to poolError()")

```ts
static poolError(operation: string, cause?: Error): ConnectionError;

```

Create a connection error for pool errors

#### Parameters[​](#parameters-3 "Direct link to Parameters")

| Parameter   | Type     |
| ----------- | -------- |
| `operation` | `string` |
| `cause?`    | `Error`  |

#### Returns[​](#returns-5 "Direct link to Returns")

`ConnectionError`

***

### queryFailed()[​](#queryfailed "Direct link to queryFailed()")

```ts
static queryFailed(cause?: Error): ConnectionError;

```

Create a connection error for query failure

#### Parameters[​](#parameters-4 "Direct link to Parameters")

| Parameter | Type    |
| --------- | ------- |
| `cause?`  | `Error` |

#### Returns[​](#returns-6 "Direct link to Returns")

`ConnectionError`

***

### transactionFailed()[​](#transactionfailed "Direct link to transactionFailed()")

```ts
static transactionFailed(cause?: Error): ConnectionError;

```

Create a connection error for transaction failure

#### Parameters[​](#parameters-5 "Direct link to Parameters")

| Parameter | Type    |
| --------- | ------- |
| `cause?`  | `Error` |

#### Returns[​](#returns-7 "Direct link to Returns")

`ConnectionError`