OpenSERP is a free, open-source API and CLI for accessing normalized search engine results from Google, Yandex, Baidu, Bing, DuckDuckGo, and Ecosia.

Run it locally, self-host it, or use the optional hosted API when you do not want to manage infrastructure.

Official website: openserp.org

Feedback: GitHub Issues · Telegram · feedback@openserp.org

💡 OpenSERP is free and open-source. Only links listed in this repository and on the official website are associated with the project.

• 🔍 Multi-engine - search with dedicated endpoints for each engine
• 🌐 Megasearch - cross-engine aggregation with deduplication
• 🖼 Images - image search is also available
• 🎯 Advanced filters - language, date range, file type, and site queries
• 🌍 Configurable - proxy, cache, and resilient mode
• 🐳 Docker-ready - local and container deployment
• 📝 Data Formats - JSON, Markdown, Text, NdJSON response formats

# Run the API server via prebuilt image
docker run -p 127.0.0.1:7000:7000 -it karust/openserp serve -a 0.0.0.0 -p 7000

# Or use docker-compose
docker compose up --build

git clone https://github.com/karust/openserp.git
cd openserp
go build -o openserp .
./openserp serve

• Self-hosted (this repo) - free, MIT-licensed, with full control over runtime, proxies, cache, and scaling.
• Hosted API - optional managed version from the project maintainers, with the same API shape.

The hosted API helps fund continued development of the open-source project. Same endpoints, same response schema, and client code can migrate either direction.

Once the server is running, the interactive docs are available locally:

• Swagger UI: http://127.0.0.1:7000/docs
• OpenAPI YAML: http://127.0.0.1:7000/openapi.yaml

To browse the spec without running the server, see docs/openapi.yaml. For a higher-level overview of how OpenSERP works internally, see the architecture docs.

Available engine names: google, yandex, baidu, bing, duckduckgo, ecosia.

Dedicated engine endpoints:

curl "http://127.0.0.1:7000/google/search?text=golang&limit=10"

Image search:

curl "http://127.0.0.1:7000/bing/image?text=golang+logo&limit=10"

Megasearch:

# Search all configured engines
curl "http://127.0.0.1:7000/mega/search?text=golang&limit=10"

# Fast mode: only one fastest engine is queried
curl "http://127.0.0.1:7000/mega/search?text=golang&mode=fast&engines=google,bing,yandex"

# Any mode: sequential fallback in provided order (default order if none provided)
curl "http://127.0.0.1:7000/mega/search?text=golang&mode=any&engines=google,yandex,bing"

# Balanced mode (default): parallel all engines with aggregation controls
curl "http://127.0.0.1:7000/mega/search?text=golang&mode=balanced&dedupe=true&merge=true"

# Advanced filtering
curl "http://127.0.0.1:7000/mega/search?text=golang&engines=google,bing&limit=20&date=20250101..20251231&lang=EN&region=US"

# Image megasearch
curl "http://127.0.0.1:7000/mega/image?text=golang+logo&limit=20"

List engines:

curl "http://127.0.0.1:7000/mega/engines"

Common parameters:

Engine-specific parameters:

{
  "query": {
    "text": "golang",
    "engines_requested": ["google"]
  },
  "meta": {
    "request_id": "019dc6c1-da45-706e-a57c-d671fa2862ee",
    "requested_at": "2026-04-25T22:27:52Z",
    "took_ms": 6410,
    "engines_failed": [],
    "version": "2.1"
  },
  "results": [
    {
      "id": "s_78341aa47c336101",
      "rank": 1,
      "type": "organic",
      "title": "Documentation - The Go Programming Language",
      "url": "https://go.dev/doc/",
      "display_url": "go.dev > doc",
      "snippet": "Official Go documentation, tutorials, references, and release notes.",
      "domain": "go.dev",
      "favicon": "https://go.dev/favicon.ico",
      "position": {
        "absolute": 1
      },
      "engine": "google",
      "domain_info": {
        "tld": "dev",
        "sld": "go",
        "category": ""
      }
    }
  ],
  "pagination": {
    "page": 1,
    "has_more": true,
    "next_start": 25
  }
}

/mega/search returns the same envelope plus clusters. Results are deduplicated by normalized URL; clusters keep the per-engine occurrences.

{
  "id": "c_a1b2c3d4e5f6a1b2",
  "canonical_url": "https://go.dev/",
  "domain": "go.dev",
  "title": "The Go Programming Language",
  "occurrences": [
    { "engine": "google", "rank": 1, "result_id": "s_78341aa47c336101" },
    { "engine": "bing", "rank": 2, "result_id": "s_20f9f15f0c3d9f6d" }
  ],
  "engines_count": 2,
  "best_rank": 1,
  "score": 0.75
}

{
  "id": "i_a1b2c3d4e5f6a1b2",
  "rank": 1,
  "type": "image",
  "title": "Go Gopher Logo",
  "image": {
    "url": "https://example.com/images/go-logo.png",
    "thumbnail": "https://example.com/images/go-logo-thumb.png",
    "width": 1200,
    "height": 800
  },
  "source": {
    "page_url": "https://go.dev/brand/",
    "domain": "go.dev"
  },
  "engine": "bing"
}

400 Bad Request:

{
  "error": "bad_request",
  "code": 400,
  "message": "EMPTY_QUERY: query cannot be empty: provide text, site, or file parameter",
  "reason": "EMPTY_QUERY"
}

503 Service Unavailable:

{
  "error": "service_unavailable",
  "code": 503,
  "message": "captcha found, please stop sending requests for a while: captcha detected"
}

OpenSERP supports HTTP and SOCKS5 proxies.

Simple global proxy:

./openserp serve --proxy socks5://127.0.0.1:1080
./openserp search bing "query" --proxy http://user:pass@127.0.0.1:8080

Advanced proxy configuration is available in config.yaml. You can enable tagged proxy pools and per-request override via X-Use-Proxy: <tag> or X-Use-Proxy: direct.

A managed API is also available for teams that do not want to operate infrastructure.

curl -i "http://127.0.0.1:7000/health"
curl "http://127.0.0.1:7000/ready"
curl "http://127.0.0.1:7000/stats"
curl "http://127.0.0.1:7000/stats/cache"
curl "http://127.0.0.1:7000/stats/proxy"
curl "http://127.0.0.1:7000/stats/cb"

This project is licensed under the MIT License. See LICENSE.

Contributions are welcome. See docs/CONTRIBUTING.md.

• GitHub Issues - bugs, feature ideas, and reproducible issues.
• Telegram channel - OpenSERP news, release notes, and project updates. Direct messages are open for quick feedback and hosted API questions.
• feedback@openserp.org - private notes, longer feedback, or anything that does not fit GitHub Issues.