What is Insomnia Mockbin used for?

Insomnia Mockbin is a backend for Insomnia's API mocking feature, maintained by Kong, that echoes and mocks HTTP requests in HAR format; source-visible rather than open source. It is a good fit for mocking endpoints during API development and inspecting HTTP requests in tests.

Is Insomnia Mockbin open source?

Yes. Insomnia Mockbin is open source under a custom licence. Its source code is on GitHub at Kong/insomnia-mockbin and is written mainly in JavaScript.

Is Insomnia Mockbin free?

Yes. Insomnia Mockbin is open source, so the software itself is free to use under the terms of its own licence.

What is Insomnia Mockbin an alternative to?

Insomnia Mockbin is an open-source alternative to Beeceptor and Webhook.site. Other open-source alternatives to Beeceptor include Mocky, Mockoon and DummyJSON.

Is Insomnia Mockbin actively maintained?

Yes. The most recent commit to Insomnia Mockbin was on 24 September 2026, and the latest release is v2.0.2, published on 1 July 2024. The project has 2.1k stars on GitHub.

Insomnia Mockbin: open-source alternative to Beeceptor

About Insomnia Mockbin

Insomnia Mockbin is the service behind the API mocks capability of the Insomnia API client. It is built and maintained by Kong, the company behind the open-source Kong Gateway. The README states plainly that the repository is source-visible but not open source, so the LICENSE file should be read before using it.

The tool uses the HAR format and can return responses as JSON, YAML, XML, or HTML. It works well behind proxies by respecting the usual forwarding headers. Topics cover API mocking, testing, and API management. The repository documents how to run it with Node or with Docker Compose, and publishes API docs, a software bill of materials, and instructions to verify container image signatures and provenance.

Mockbin suits developers and QA engineers who need a quick endpoint for generating, inspecting, and mocking HTTP requests during API development and testing, and teams that want to host the same backend that powers Insomnia's mocks.

Key features

HTTP request mocking and echoing
Uses the HAR format
JSON, YAML, XML, and HTML output
Runs with Node or Docker Compose
Signed container images with SBOM
API documentation

Good fit for

→Mocking endpoints during API development
→Inspecting HTTP requests in tests

Built with: JavaScript
Tags: api-mocking; mockbin; insomnia; kong; http; har; api-testing; nodejs

Insomnia Mockbin: questions and answers

What is Insomnia Mockbin used for?: Insomnia Mockbin is a backend for Insomnia's API mocking feature, maintained by Kong, that echoes and mocks HTTP requests in HAR format; source-visible rather than open source. It is a good fit for mocking endpoints during API development and inspecting HTTP requests in tests.
Is Insomnia Mockbin open source?: Yes. Insomnia Mockbin is open source under a custom licence. Its source code is on GitHub at Kong/insomnia-mockbin and is written mainly in JavaScript.
Is Insomnia Mockbin free?: Yes. Insomnia Mockbin is open source, so the software itself is free to use under the terms of its own licence.
What is Insomnia Mockbin an alternative to?: Insomnia Mockbin is an open-source alternative to Beeceptor and Webhook.site. Other open-source alternatives to Beeceptor include Mocky, Mockoon and DummyJSON.
Is Insomnia Mockbin actively maintained?: Yes. The most recent commit to Insomnia Mockbin was on 24 September 2026, and the latest release is v2.0.2, published on 1 July 2024. The project has 2.1k stars on GitHub.