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Imposter uses plugins to control its behaviour and provide specialised mocks.

You can also write your own plugins, if you want to customise behaviour further.

The following table describes the available plugins.

Category Plugin name Description Details
Mock hbase HBase mocks. See HBase plugin.
Mock openapi OpenAPI (and Swagger) mocks. Built-in. See OpenAPI (and Swagger) plugin.
Mock rest REST mocks. Built-in. See REST plugin.
Mock sfdc SFDC (Salesforce) mocks. See SFDC (Salesforce) plugin.
Mock soap SOAP (and WSDL) mocks. Built-in. See SOAP plugin.
Mock wiremock WireMock mappings support. See WireMock plugin.
Scripting js-graal Graal.js scripting. Graal.js JavaScript scripting support. See Modern JavaScript features.
Scripting js-nashorn Nashorn scripting. This is the default JavaScript script engine
Store store-dynamodb DynamoDB store implementation. See DynamoDB store.
Store store-redis Redis store implementation. See Redis store.
Store store-graphql GraphQL store queries. See GraphQL.
Configuration config-detector Detects plugins from *-config files. Built-in
Configuration meta-detector Detects plugins from META-INF. Built-in
Data generator fake-data Generates fake data. See Fake data generator.

Plugin loading

Imposter loads plugins from the plugin directory. This is configured using the following environment variable:


When you set this environment variable, plugin JAR files placed in this directory will be loaded by Imposter on startup.

Using the CLI

If you are using the Imposter CLI, you can install a plugin with:

imposter plugin install -d <plugin name>

The CLI automatically manages the plugin directory, so you do not have to set the IMPOSTER_PLUGIN_DIR environment variable.

For example:

imposter plugin install -d stores-dynamodb

This will install the plugin version matching the current engine version used by the CLI. The next time you run imposter up, the plugin will be available.

Using the Docker image

If you are using the Docker image, you can bind-mount a local directory to the /opt/imposter/plugins directory within the container.

For example:

docker run --rm -it \
    -v /path/to/plugin/dir:/opt/imposter/plugins \
    -v /path/to/config/dir:/opt/imposter/config \
    -p 8080:8080 \

The Docker container sets the environment variable IMPOSTER_PLUGIN_DIR=/opt/imposter/plugins, so you do not have to set it explicitly.