# StubEngine — AI Connector

Generate live API mocks from plain descriptions. StubEngine is listed under Developer Tools in the ChatGPT apps directory, built by StubEngine.

Source: https://node8.ai/ai-connectors/developer-tools/stubengine/

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[AI Connectors](https://node8.ai/ai-connectors/) · [Developer Tools](https://node8.ai/ai-connectors/developer-tools/)

# StubEngine

Generate live API mocks from plain descriptions

Listed in ChatGPT

[ChatGPT listing](https://chatgpt.com/plugins/stubengine?open_in_app) [stubengine.com](https://stubengine.com)

Overview

## What StubEngine does

StubEngine converts written requirements into running mock endpoints. A request describes the route, the status code, and the response body in ordinary language, and the app creates a mock that can be called right away.

Scope ranges from one endpoint to a set of related endpoints held together as a project. Mocks live in a shared workspace, so a team works against the same definitions instead of local stubs that drift apart.

Two skills are listed, one for creating mocks and one for managing them. The sample requests include a GET route returning a healthy status payload and a POST payments route that answers with a 402 error, which suggests error paths are part of the intended use.

### Who it is for

Backend and integration teams that need a stand-in API before the real service exists.

### What stands out

Mock definitions sit in a shared team workspace rather than on individual machines.

Availability

## Where StubEngine is listed

StubEngine is listed in the ChatGPT apps directory only. StubEngine has no connector under the same domain in the Claude directory; 392 of the 3,150 products here are on both marketplaces, and this is not one of them.

ChatGPT apps are built on MCP, and the same server can back a Claude connector, so the absence is a distribution decision rather than a technical one.

ChatGPT listing

## In the ChatGPT apps directory

Developer

StubEngine

Filed under

Developer Tools

Listed since

July 2026

Authentication

Authenticates when installed

Website

[stubengine.com](https://stubengine.com)

Policies published

Privacy policy · Terms of service

Official listing

[Open in ChatGPT](https://chatgpt.com/plugins/stubengine?open_in_app)

Snapshot

August 2026

### Named skills

StubEngine declares 2 named skills, which puts it in the 6.7% of ChatGPT-listed apps that do.

-   **create-api-mock**
-   **manage-api-mocks**

### Example prompts from the listing

-   Create a GET endpoint /api/v1/status. It should return a 200 OK status and a JSON body containing {"status": "healthy"}
-   Create a POST mock payments charge that returns a 402 error.

Nearby

## Other Developer Tools connectors

### [Deplixo](https://node8.ai/ai-connectors/developer-tools/deplixo/)

Deploy a web app to a live URL in one call

Claude

### [Lightrun](https://node8.ai/ai-connectors/developer-tools/lightrun/)

Live runtime snapshots and metrics from running applications

Claude

### [Rezonant](https://node8.ai/ai-connectors/developer-tools/rezonant/)

Product specs, PRDs, and tasks pulled into a coding session

Claude

### [Error Log Parser](https://node8.ai/ai-connectors/developer-tools/error-log-parser/)

Turns raw error logs into structured JSON

ChatGPT

### [Ezoic Setup](https://node8.ai/ai-connectors/developer-tools/ezoic-setup/)

Implementation help for Ezoic ad integration on websites

Claude · ChatGPT

### [Git Diff Patcher Bridge](https://node8.ai/ai-connectors/developer-tools/git-diff-patcher-bridge/)

Repository inspection with patches queued for local review

ChatGPT

[All 188 Developer Tools connectors](https://node8.ai/ai-connectors/developer-tools/)

This is an independent catalogue entry compiled by Node8 from StubEngine's public marketplace listing as it stood in August 2026. Listing facts come from the marketplaces; the comparisons against the rest of the directory and any live-endpoint measurements are Node8's. Node8 is not affiliated with StubEngine, and inclusion here is not an endorsement.

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