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# Log variables

> Learn more about configurable log variables, including gateway cluster ID and application mode.

## GATEWAY\_LOG\_CONSOLE\_JSON

Determines whether console logs display in the default format or JSON format. When set to `false`, logs display in the default format:

```
2024-02-14T09:18:28-06:00 INF grpc server is starting up
```

When set to `true`, logs display in JSON format:

```
{"level":"info","time":"2024-02-14T09:18:28-06:00","message":"grpc server is starting up"}
```

### Environment Variable

`GATEWAY_LOG_CONSOLE_JSON`

### File

**Section:** `log`

**Key:** `console_json`

### Default

`false`

---

## GATEWAY\_LOG\_FILE\_ENABLED

Determines whether the gateway writes to a log file.

### Environment Variable

`GATEWAY_LOG_FILE_ENABLED`

### File

**Section:** `log`

**Key:** `file_enabled`

### Default

`true`

---

## GATEWAY\_LOG\_FILE\_JSON

Determines whether file logs display in the default format or JSON format. When set to `false`, logs display in the default format:

```
2024-02-14T09:18:28-06:00 INF grpc server is starting up
```

When set to `true`, logs display in JSON format:

```
{"level":"info","time":"2024-02-14T09:18:28-06:00","message":"grpc server is starting up"}
```

### Environment Variable

`GATEWAY_LOG_FILE_JSON`

### File

**Section:** `log`

**Key:** `file_json`

### Default

`false`

---

## GATEWAY\_LOG\_LEVEL

Sets the verbosity of the logs that the gateway displays to the console and file
logs.

### Environment Variable

`GATEWAY_LOG_LEVEL`

### File

**Section:** `log`

**Key:** `level`

### Default

`INFO`

### Log Levels

`["TRACE", "DEBUG", "INFO", "WARN", "ERROR", "FATAL", "DISABLED"]`

---

## GATEWAY\_LOG\_SERVER\_DIR

Sets the directory for the `gateway.log` file when you launch the gateway as a server. When you don't launch the gateway as a server or runner, the system places logs in `GATEWAY_APPLICATION_WORKING_DIR`.

### Environment Variable

`GATEWAY_LOG_SERVER_DIR`

### File

**Section:** `log`

**Key:** `server_dir`

### Default

`/var/log/gateway`

---

## GATEWAY\_LOG\_TIMESTAMP\_TIMEZONE

Sets the timezone for timestamps in gateway logs. For example:

```
2024-05-03T10:36:55-05:00 INF using local connection
```

Timezones are shown in UTC by default. When you set this to `local`, the gateway uses your machine's timezone. You can also set a timezone (`tz`) identifier such as `America/New_York`.

### Environment Variable

`GATEWAY_LOG_TIMESTAMP_TIMEZONE`

### File

**Section:** `log`

**Key:** `timestamp_timezone`

### Default

`utc`

### Timezone Values

`["utc", "local", ...any tz identifier]`

> Learn more about configurable log variables, including gateway cluster ID and application mode.