OmniSerp

A modular, plugin-based search engine abstraction package for Go that provides a unified interface for multiple search engines.

Overview

The omniserp package provides:

• Unified Client SDK: Single API that fronts multiple search engine backends
• Normalized Responses: Optional unified response structures across all engines (engine-agnostic)
• Capability Checking: Automatic validation of operation support across different backends
• Unified Interface: Common Engine interface for all search providers
• Plugin Architecture: Easy addition of new search engines
• Multiple Providers: Built-in support for Serper, SerpAPI, Brave Search, and Exa.ai
• Type Safety: Structured parameter and result types
• Registry System: Automatic discovery and management of engines
• MCP Server: Model Context Protocol server for AI integration with optional secure credentials
• CLI Tool: Command-line interface for quick searches

Quick Start

package main

import (
    "context"
    "fmt"
    "log"

    "github.com/plexusone/omniserp"
    "github.com/plexusone/omniserp/client"
)

func main() {
    // Set API key
    // export SERPER_API_KEY="your_key"

    // Create client (auto-selects engine)
    c, err := client.New()
    if err != nil {
        log.Fatal(err)
    }

    // Perform a search
    result, err := c.Search(context.Background(), omniserp.SearchParams{
        Query: "golang programming",
    })
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("Results: %+v\n", result.Data)
}

Project Structure

omniserp/
├── client/                 # Search engine client implementations
│   ├── client.go           # Unified Client SDK with capability checking
│   ├── serper/             # Serper.dev implementation
│   ├── serpapi/            # SerpAPI implementation
│   ├── brave/              # Brave Search API
│   └── exa/                # Exa.ai neural search
├── cmd/                    # Executable applications
│   ├── mcp-omniserp/       # MCP server for AI integration
│   └── omniserp/           # CLI tool
├── examples/               # Example programs
│   ├── capability_check/   # Capability checking demo
│   └── normalized_search/  # Normalized responses demo
├── types.go                # Core types and Engine interface
├── normalized.go           # Normalized response types
├── normalizer.go           # Response normalizer
└── omniserp.go             # Utility functions

Installation

go get github.com/plexusone/omniserp@latest

Environment Configuration

# Choose which engine to use (optional, defaults to "serper")
export SEARCH_ENGINE="serper"  # or "serpapi", "brave", "exa"

# API keys for respective engines
export SERPER_API_KEY="your_serper_key"
export SERPAPI_API_KEY="your_serpapi_key"
export BRAVE_API_KEY="your_brave_key"
export EXA_API_KEY="your_exa_key"

Supported Engines

Engine	Best For	Key Features
Serper	Full SERP data	All 12 search types, Lens support
SerpAPI	Google scraping	Reliable, well-documented
Brave	Privacy, speed	Free tier, summarizer, goggles
Exa	LLM/AI apps	Neural search, content extraction

See Engines Overview for detailed feature comparison.