3.6 / 5

API Mocker

Describe an API endpoint, get a working mock server instantly

Useful

Instant

Zero Cost

The Problem

Backend isn't ready, frontend is blocked waiting for APIs

Current Solutions (Not Great)

JSON Server, MSW, hardcoded data

Who Needs This

Frontend developers, teams with parallel workstreams

Backend not ready? Describe your endpoints in plain English and get a working mock server with realistic data, configurable delays, and error simulation. Export as MSW handlers or OpenAPI spec.

Honest Take

Genuinely useful for frontend teams blocked on backend. MSW and json-server exist but require setup. The AI angle speeds up mock creation. Could integrate well with OpenAPI/Swagger ecosystems. The challenge: most devs only need this occasionally, so retention is low. Best as a feature in a larger API development platform.

Monetization Ideas

Ways to turn this into revenue

Free / Open Source

GitHub stars, Twitter followers, job opportunities

Freemium

Free basic, $5-15/mo for pro

One-Time Purchase

$9-49 per license

Features

Key features that make this app valuable

Describe endpoints in plain English
Generates realistic response data
Simulates delays, errors, edge cases
OpenAPI spec generation
Works as local server or service worker
Stateful mock (remembers POSTs)

Build Prompt

Use this prompt with an AI assistant to start building

Build a React PWA called 'API Mocker' using WebInfer for AI inference. UI: endpoint builder where user describes API in natural language (e.g., 'GET /users returns list of users with id, name, email. POST /users creates new user. GET /users/:id returns single user'). Use generateObject to return { endpoints: [{ method: string, path: string, description: string, responseSchema: object, sampleResponse: object, errorResponses: object }] }. Generates mock server code (MSW service worker or Express). Preview panel lets you test endpoints directly in browser. Options: response delay (ms), error rate %, data count. Export as MSW handlers, Express server, or OpenAPI spec YAML. Stateful mode remembers created resources across requests. Realistic data generation for common types (emails, names, dates, UUIDs).

Score Breakdown

Pain