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Imposter

Scriptable, lightweight mock server for REST and SOAP APIs

Developer Tools & Git Easy setup GPL-3.0

Imposter is a scriptable, lightweight mock server for creating mock REST, SOAP and other APIs from OpenAPI specs or simple config. It is self-hosted as a single binary or container for testing.

Official siteSource code

Key features

  • Mock from OpenAPI specs
  • Scriptable behavior
  • REST and SOAP support
  • Self-hostable

Strengths

  • Released under the GPL-3.0 license
  • Easy to set up — beginner-friendly
  • First-class Docker support for quick deployment
  • Written in Kotlin

Is Imposter secure?

OSV.dev has no published security advisories for Imposter's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

Imposter replaces

Self-hosted WireMock alternatives

Health badge

Maintain Imposter? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 99 · excellent

Markdown
[![SelfHostIndex health score for Imposter](https://selfhostindex.com/badge/imposter-mock.svg)](https://selfhostindex.com/app/imposter-mock/)
HTML
<a href="https://selfhostindex.com/app/imposter-mock/"><img src="https://selfhostindex.com/badge/imposter-mock.svg" alt="SelfHostIndex health score for Imposter"></a>
reStructuredText
.. image:: https://selfhostindex.com/badge/imposter-mock.svg
   :alt: SelfHostIndex health score for Imposter
   :target: https://selfhostindex.com/app/imposter-mock/

The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

Compare Imposter

3 head-to-head comparisons.

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