ragilhadi/mimic
Mimic is a fast, lightweight HTTP mock server. Perfect for testing, development, and API prototyping
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ragilhadi/mimic repository overview
🧩 Mimic - Lightweight HTTP Mock Server
Mimic is a fast, lightweight HTTP mock server built with Rust and Axum. Perfect for testing, development, and API prototyping. Define your mock responses in simple JSON files and let Mimic handle the rest.
✨ Features
- 🚀 Blazing Fast - Built with Rust and Axum for maximum performance
- 💾 Ultra Lightweight - Only 1.66 MiB memory usage
- 📁 File-Based Configuration - Define mocks in simple JSON files
- 🔄 Hot Reload - Changes to mock files are reflected immediately
- 🐳 Docker Ready - Pre-built images available on Docker Hub
- ✅ Well Tested - 35+ unit tests with 90% code coverage
- 🔧 Easy to Use - Simple configuration, no complex setup
📊 Performance
Mimic is incredibly efficient and lightweight:
CONTAINER ID NAME CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS
b056ebec5099 mimic 0.02% 1.66MiB / 6.238GiB 0.03% 17.1kB / 34.6kB 0B / 0B 17
Key Metrics:
- Memory Usage: Only 1.66 MiB (yes, megabytes!)
- CPU Usage: 0.02% at idle
- Startup Time: < 1 second
- Response Time: < 10ms for most requests
Perfect for resource-constrained environments, CI/CD pipelines, and local development.
🚀 Quick Start
Using Docker (Recommended)
Pull the latest image from Docker Hub:
docker pull ragilhadi/mimic:latest
Run with your mock files:
docker run -d \
--name mimic \
-p 8080:8080 \
-v $(pwd)/mocks:/app/mocks:ro \
ragilhadi/mimic:latest
Test it:
curl http://localhost:8080/health
Using Docker Compose
- Create a
docker-compose.yml:
services:
mimic:
image: ragilhadi/mimic:latest
container_name: mimic
ports:
- "8080:8080"
volumes:
- ./mocks:/app/mocks:ro
environment:
- PORT=8080
- RUST_LOG=info
restart: unless-stopped
- Start the service:
docker compose up -d
📝 Configuration
Environment Variables
Create a .env file to customize your setup:
# Port configuration (default: 8080)
PORT=8080
# Logging level: trace, debug, info, warn, error (default: info)
RUST_LOG=info
Log Levels:
trace- Very detailed debuggingdebug- Detailed debugginginfo- General information (recommended)warn- Warnings onlyerror- Errors only
Mock Files
Mimic reads mock definitions from JSON files in the /app/mocks directory (or ./mocks locally).
Mock File Structure:
{
"method": "GET",
"path": "/users",
"status": 200,
"response": {
"users": [
{
"id": 1,
"name": "Alice Johnson",
"email": "[email protected]"
}
]
}
}
Fields:
method- HTTP method (GET, POST, PUT, DELETE, PATCH, etc.)path- URL path (e.g.,/users,/api/v1/products)status- HTTP status code (200, 201, 404, 500, etc.)response- JSON response body (can be object, array, or null)
📁 Mock Examples
Example 1: GET Request
File: mocks/get_users.json
{
"method": "GET",
"path": "/users",
"status": 200,
"response": {
"users": [
{
"id": 1,
"name": "Alice Johnson",
"email": "[email protected]",
"role": "admin"
},
{
"id": 2,
"name": "Bob Smith",
"email": "[email protected]",
"role": "user"
}
],
"total": 2
}
}
Usage:
curl http://localhost:8080/users
Example 2: POST Request
File: mocks/post_login.json
{
"method": "POST",
"path": "/login",
"status": 200,
"response": {
"success": true,
"token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
"user": {
"id": 1,
"username": "admin",
"email": "[email protected]"
},
"expiresIn": 3600
}
}
Usage:
curl -X POST http://localhost:8080/login
Example 3: Error Response
File: mocks/get_error.json
{
"method": "GET",
"path": "/error",
"status": 500,
"response": {
"error": "Internal Server Error",
"message": "Something went wrong",
"code": "ERR_500"
}
}
Usage:
curl http://localhost:8080/error
Example 4: DELETE Request
File: mocks/delete_user.json
{
"method": "DELETE",
"path": "/users/123",
"status": 204,
"response": null
}
Usage:
curl -X DELETE http://localhost:8080/users/123
Tag summary
Content type
Image
Digest
sha256:db1252039…
Size
34 MB
Last updated
27 days ago
docker pull ragilhadi/mimic