Mock Server Studio: Local API

LKPixel

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About this app

Mock Server Studio transforms your Android device into a high-performance, offline-capable local mock API server. Built for mobile app developers, QA automation engineers, frontend teams, and backend architects who need rapid, reliable endpoint simulation without configuring remote servers or depending on internet access.

Whether you are testing edge-case network resilience, verifying client integrations, or prototyping UI flows before backend deployment, Mock Server Studio delivers a zero-config testing backend directly across your local network.

CORE PROTOCOLS & CAPABILITIES

• Full REST API Simulation
Simulate GET, POST, PUT, PATCH, and DELETE requests. Return static or templated JSON, raw text, HTML, and binary payloads (PNG/PDF). Configure custom HTTP status codes, latency delays (ms), custom response headers, and parameterized path routing (/api/v1/users/:id).

• Stateful In-Memory Collections (CRUD Engine)
Simulate functional in-memory databases with persistent RAM state. POST requests create auto-incremented records with UUID identifiers, GET retrieves dynamic arrays, and PUT/PATCH/DELETE modify records via path IDs in real time.

• Import & Export Suite
Migrate and share testing environments across your developer toolkit:
- Bulk Import: Instantly load Postman Collection v2.1 exports or browser HAR 1.2 network sessions, preserving route paths, payloads, custom headers, and auth tokens.
- Postman Export: Share mock routes directly with frontend and QA teams.
- HAR 1.2 Session Archive: Inspect captured history across Chrome DevTools.
- Diagnostic PDF Audit Reports: Generate session summaries with KPI telemetry, latency analytics, and failure traces.

• Real-Time WebSocket Server
Establish persistent two-way WebSocket channels (ws://) for reactive UI testing. Enable bi-directional message echoing or schedule automated telemetry frames with custom broadcast intervals.

• Server-Sent Events (SSE) & AI Streaming
Validate generative AI apps without live inference fees. Stream token-by-token payloads using OpenAI-compatible formats (chat.completion.chunk) or trigger automated repeating JSON tickers.

• GraphQL Operation Matching
Serve POST requests to /graphql with automatic operation resolution. Map multiple queries and mutations through a single endpoint by matching against operation names.

• Dynamic Templating & Faker Engine
Generate varied mock schemas dynamically on every request:
- Identifiers: {{uuid}}, {{timestamp}}, {{index}}
- Faker Entities: {{random.name}}, {{random.email}}, {{random.city}}, {{random.price}}
- Request Context: {{params.id}}, {{query.filter}}, {{header.User-Agent}}

• Deep Traffic Inspector & Multipart Diagnostics
Analyze all inbound and outbound network traffic in real time:
- Detailed breakdown of query strings, headers, and request/response payloads
- Multipart form-data inspection with file upload capture and binary image previews
- Performance metrics: average latency, pass/fail ratios, and bandwidth usage
- Failure isolation filters to pinpoint 4xx and 5xx errors instantly

• Security & Auth Simulation
Safeguard mock routes with granular credential policies:
- API Key verification via x-api-key
- Bearer token authentication via Authorization: Bearer
- Custom rejection status codes and structured 401 error payloads

ENGINEERED FOR PRODUCTION WORKFLOWS

- Local & Offline Execution: Operates on local Wi-Fi, mobile hotspots, or loopback localhost.
- Emulator Ready: Instant Android emulator tunneling using "adb reverse tcp:8080 tcp:8080".
- Background Persistence: Low-overhead foreground service maintains uninterrupted server listening during background testing.
- Visual Route Reordering: Reorder endpoints to control routing priority.
- Zero Data Tracking: Complete privacy compliance. Your payload data, headers, and logs never leave your device.

What’s new

Initial release of Mock Server Studio!
• Run local offline mock API servers on localhost & Wi-Fi.
• Support for REST, WebSocket, SSE AI streaming, and GraphQL.
• Stateful in-memory CRUD collections.
• Real-time network traffic inspector & request logs.
• Export reports to Postman, HAR, and PDF.