MCP JavaScript Server
About
An unofficial JavaScript SDK to create customized servers for the Model Context Protocol, allowing definition of prompts, resources, and tools for tailored interactions.
Details
- Author
- davlgd
- Repository
- davlgd/mcp-js-server
- GitHub stars
- 2
- Downloads
- 384
- License
- Apache License 2.0
- Categories
- Developer Tools, AI
Jump to
- Define prompts, resources, and tools in JavaScript
- Supports async tool handlers with JSON Schema validation
- Lightweight, unofficial implementation of the MCP spec
- Available as an npm package (mcp-js-server)
- Logs stored in platform‑specific system directories
Setting up with Highlight
Follow these steps to add this server as a custom Highlight plugin:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
MCP JavaScript ServerCommand (node, npx, python, etc.)npxArguments-
Argument 1
-y -
Argument 2
@highlight/mcp-server
Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
-
Argument 1
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
Import the package to your project:
npm install mcp-js-server
Create files to define the server's prompts, resources, and tools. See mcp-clever-demo, or the examples below:
simple_tool
A simple tool that returns the current date and time.
complex_tool
A complex tool that takes two parameters (param1, param2) and returns a formatted string. Parameters: param1 (string), param2 (string).
// tools.js
export const tools = {
simple_tool: {
description: 'A simple tool',
handler: async () => new Date().toLocaleString(),
schema: {
type: 'object',
properties: {},
required: []
}
},
complex_tool: {
description: 'A complex tool',
handler: async ({ param1, param2 }) => {
return param1: ${param1}, param2: ${param2};
},
schema: {
type: 'object',
properties: {
param1: { type: 'string' },
param2: { type: 'string' }
},
required: ['param1', 'param2']
}
}
};
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"mcp javascript server": {
"env": {},
"args": [
"-y",
"@highlight/mcp-server"
],
"command": "npx"
}
}
}Linux
{
"env": [],
"args": [
"-y",
"@highlight/mcp-server"
],
"command": "npx"
}Macos
{
"env": [],
"args": [
"-y",
"@highlight/mcp-server"
],
"command": "npx"
}Windows
{
"env": [],
"args": [
"/c",
"npx",
"-y",
"@highlight/mcp-server"
],
"command": "cmd"
}Server
Then create a server instance with the following code:
// server.js
import { MCP } from 'mcp-server';
import { tools } from './tools.js';
import { prompts } from './prompts.js';
import { resources } from './resources.js';
const infos = {
name: 'mcp-demo-server',
version: '0.1.0'
};
const server = new MCP(infos, prompts, resources, tools);
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