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@hanai/mcp-server-searxng

v0.1.0

Published

Self-hosted MCP server that wraps SearXNG's /search API as a single search tool, served over MCP Streamable HTTP.

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hanaihanai

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Readme

@hanai/mcp-server-searxng

A self-hosted MCP server that wraps SearXNG's /search API as a single search tool, served over MCP Streamable HTTP. Deployable on Bun, Docker, and Cloudflare Workers.

Tool

search — parameters: query (required), categories, engines, language, pageno, time_range (day|month|year), safesearch (0|1|2). Returns results as a Markdown list. categories and engines are comma-separated lists.

Configuration

Copy config.example.json to config.json and edit. AppConfig covers both the upstream SearXNG endpoints and this server's own bearer tokens:

  • endpoints[] — { url, headers? }, at least one. headers are sent to that endpoint.
  • mcp.path — optional MCP endpoint path, default /mcp. Use /searxng/mcp only when your gateway forwards that full path to this app; if the gateway strips /searxng, keep the default /mcp.
  • mcp.bearerTokens[] — one or more tokens; any is accepted on the MCP endpoint.
  • mcp.allowedHosts[] — optional. Required for non-localhost deployments (Cloudflare Workers, or any host reached via a real domain/IP): set it to the hostname(s) this server is reached at, otherwise every request is rejected with 403.
  • requestTimeoutMs — optional, default 10000.

SearXNG prerequisite

Every configured endpoint must have json listed under search.formats in its settings.yml. This server always requests format=json; an endpoint without it returns 403 on every request.

Deployment note: request-body limits

Bearer auth is this server's primary protection, but the MCP HTTP layer (createMcpHonoApp) parses a request's JSON body before the bearer-token check runs. On Bun/VPS there is no built-in body-size limit, so an unauthenticated client could send a large body that gets buffered and parsed before being rejected with 401. Put a reverse proxy or platform limit in front that caps request body size (e.g. Traefik/nginx maxRequestBodyBytes; Cloudflare Workers enforces its own limits). This matches the intended self-hosted-behind-a-proxy deployment model.

Run

Bun (local / VPS)

bun install && CONFIG_PATH=./config.json bun run src/entry-bun.ts (port via PORT, default 3000).

Published package CLI:

bunx @hanai/mcp-server-searxng@latest

Docker

docker compose up (mounts ./config.json, runs the published package via bunx).

Cloudflare Workers

bunx wrangler secret put CONFIG_JSON then bunx wrangler deploy.

Development

  • bun test — run the automated suite.
  • bun run typecheck — type-check with tsc --noEmit.
  • bun run build — bundle the Bun entry to dist/entry-bun.js (published as mcp-server-searxng).
  • bun run scripts/manual-search.ts <query> — manual integration check against a real instance.

Verify-before-code rule

Any use of a library/framework/API must be verified against current official docs (via context7) and, for SearXNG behavior, against https://docs.searxng.org/dev/search_api.html before writing code. This applies for the whole lifetime of the project.