# Kafka Connect GzipDecompress SMT Usage Reference for Confluent Platform The `GzipDecompress` SMT (`io.confluent.connect.transforms.GzipDecompress`) decompresses a Gzip-compressed byte array back to its original uncompressed byte array. #### NOTE GzipDecompress is not available for [managed connectors](https://docs.confluent.io/cloud/current/connectors/index.html). ## Description The `GzipDecompress` SMT decompresses a byte-array input that was previously Gzip-compressed. It works only with byte-array (`BYTES`) input. The SMT decompresses the input using `java.util.zip.GZIPInputStream` and returns the resulting byte array. Based on your requirements, use the transformation type designed for the record key (`io.confluent.connect.transforms.GzipDecompress$Key`) or the record value (`io.confluent.connect.transforms.GzipDecompress$Value`). ## Installation Confluent develops this transformation and does not ship it by default with Apache Kafka® or Confluent Platform. You can install this transformation using the [confluent connect plugin install](https://docs.confluent.io/confluent-cli/current/command-reference/connect/plugin/confluent_connect_plugin_install.html) command: ```bash confluent connect plugin install confluentinc/connect-transforms:latest ``` ## Examples The following example shows how to configure and use `GzipDecompress`. ### Gzip-decompress a byte-array value This configuration snippet shows how to decompress a Gzip-compressed value. ```json "transforms": "gzipDecompress", "transforms.gzipDecompress.type": "io.confluent.connect.transforms.GzipDecompress$Value" ``` Because the values are binary, this example uses base64 to display them as readable text. To prepare the input, encode the text `Hello world` as base64, then Gzip-compress the result: ```bash # Encode "Hello world" as base64 echo "Hello world" | base64 # Output: SGVsbG8gd29ybGQK # Gzip-compress the base64-encoded value echo "SGVsbG8gd29ybGQK" | gzip ``` The SMT decompresses the Gzip-compressed value back to the base64-encoded text: - Before: the Gzip-compressed bytes produced by compressing `SGVsbG8gd29ybGQK` - After: `SGVsbG8gd29ybGQK` (the base64 encoding of `Hello world`) ## Predicates Configure transformations with predicates to ensure they process only records that satisfy a particular condition. You can also use predicates in a transformation chain with the [Kafka Connect Filter (Kafka) SMT Usage Reference for Confluent Platform](filter-ak.md#ak-filter) to conditionally filter specific records. For more information, see [Predicates](filter-ak.md#predicates).