| FormatterInterface | Interface for formatters |
| ChromePHPFormatter | Formats a log message according to the ChromePHP array format |
| ElasticaFormatter | Format a log message into an Elastica Document |
| ElasticsearchFormatter | Format a log message into an Elasticsearch record |
| FlowdockFormatter | formats the record to be used in the FlowdockHandler |
| FluentdFormatter | Class FluentdFormatter |
| GelfMessageFormatter | Serializes a log message to GELF |
| GoogleCloudLoggingFormatter | Encodes message information into JSON in a format compatible with Cloud logging. |
| HtmlFormatter | Formats incoming records into an HTML table |
| JsonFormatter | Encodes whatever record data is passed to it as json |
| LineFormatter | Formats incoming records into a one-line string |
| LogglyFormatter | Encodes message information into JSON in a format compatible with Loggly. |
| LogmaticFormatter | Encodes message information into JSON in a format compatible with Logmatic. |
| LogstashFormatter | Serializes a log message to Logstash Event Format |
| MongoDBFormatter | Formats a record for use with the MongoDBHandler. |
| NormalizerFormatter | Normalizes incoming records to remove objects/resources so it's easier to dump to various targets |
| ScalarFormatter | Formats data into an associative array of scalar values. |