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Claim this listingExplore, analyze, and decompile Java JAR files via MCP
Quick Install
Automated & IDE SetupCopy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.
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Manual Client & Custom JSON ConfigExpand JSON ▾
Client Config & Setup
Choose your client or environment
Target File:
💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.
Documentation Overview
dejared-mcp: Java decompiler MCP server
dejared-mcp is a Java decompiler and JAR analyzer that speaks the Model Context
Protocol. It lets an AI coding agent (Claude Code, Codex, Cursor, VS Code)
open a .jar, .war, .ear, or .aar, list what is inside, search its
bytecode, and decompile any class back to Java source using CFR, Vineflower,
or Procyon.
Table of Contents
- Overview
- Prerequisites
- Quick Start
- Install as a plugin (recommended)
- Install as an MCP server
- Features
- Decompiler Engines
- Custom Java Path
- Server Configuration
- How It Works
- FAQ and Troubleshooting
- Contributing
- Third-Party Licenses
- License
Overview
dejared-mcp is a Java-based MCP server distributed as an npm package.
It provides nine tools organized into three categories: discovery, hunting,
and deep analysis. AI assistants use these tools to navigate JAR file
structures, search for classes and string literals in bytecode, and
decompile .class files back to readable Java source code.
Reach for it whenever a dependency ships without sources: reading what a
third-party library actually does, recovering an application.yml or
MANIFEST.MF embedded in a JAR, following a stack trace into a library you
have no source for, or inspecting an obfuscated plugin or mod. It replaces
hand-running jar tf, unzip, javap, or a desktop decompiler.
Any ZIP-based Java archive works: .jar, .war, .ear, .aar, and
Spring Boot fat-jars.
The npm package acts as a thin wrapper that downloads and caches the
server JAR on first run, then spawns it via java -jar using stdio
transport.
Prerequisites
- Node.js 20 or later
- Java 17 or later (JRE is sufficient)
Quick Start
The best install is the plugin. One command pair gives your agent both halves:
the nine MCP tools, and the jar-analysis skill that tells it when to
reach for them instead of shelling out to jar tf, unzip, or javap.
Codex carries the same bundle. See Install as a plugin. Every other client takes the plain MCP config.
Install as a plugin (recommended)
The MCP server on its own gives an agent nine tools. It does not tell the agent
when to use them, so most agents keep reaching for jar tf, unzip -p, and
javap -p out of habit and never touch the tools you installed.
A plugin ships both parts together:
| Part | What it does |
|---|---|
| MCP server | The nine tools listed under Features |
jar-analysis skill | Routes JAR questions to those tools, picks the cheap tool before the expensive one, and knows which decompiler to retry with |
Two tools support that bundle today. Everything else is MCP-only.
Claude Code
Inside a session, the same commands work as /plugin marketplace add ... and
/plugin install .... If the install summary says Run /reload-plugins to activate, run it.
Codex
Start a new session afterwards so the bundled skill and server load. Check with
codex mcp list. dejared should be listed as enabled.
Install as an MCP server
For clients without a plugin system. You get the tools, but not the skill that steers the agent toward them.
Most clients accept this standard config:
From the command line
If your tool has a CLI, one line is enough:
Where the config file lives
Drop the standard config into the file for your tool:
| Tool | Location |
|---|---|
| Claude Desktop | %APPDATA%\Claude\claude_desktop_config.json (Windows) · ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) |
| Claude Code | .mcp.json in the project root |
| Cursor | .cursor/mcp.json (project) · ~/.cursor/mcp.json (global) |
| Windsurf | MCP servers panel in settings, or mcpServers in your settings file |
| Cline | MCP settings file, via the extension's MCP Servers panel |
| Antigravity Editor | ~/.gemini/antigravity/mcp_config.json |
| Kiro | .kiro/settings/mcp.json |
| Copilot CLI | ~/.copilot/mcp-config.json, or run /mcp add |
| Gemini CLI | ~/.gemini/settings.json (global) · .gemini/settings.json (project) |
| Goose | Advanced settings → Extensions → Add custom extension, type STDIO |
| JetBrains IDEs | Settings → Tools → AI Assistant → Model Context Protocol (MCP) |
| Qodo Gen | Chat panel → Connect more tools → + Add new MCP |
A few setups need more than the standard config. Expand those below.
Codex: TOML instead of JSON
The -- matters: everything after it is the server's launch command.
Or edit ~/.codex/config.toml (global) or .codex/config.toml (project):
VS Code (GitHub Copilot): uses servers, not mcpServers
Create or edit .vscode/mcp.json:
After saving, click Start above the server entry, then use Agent mode in Copilot Chat.
opencode: command is an array
Edit ~/.config/opencode/opencode.json:
Pure Java (no Node.js required)
If you prefer to run the server JAR directly without Node.js:
-
Download the latest JAR from GitHub Releases.
-
Run it:
-
Configure your MCP client to use the JAR directly instead of
npx:
Features
Discovery
Browse and read JAR contents.
| Tool | Description |
|---|---|
dejared_list_packages | List all packages with class counts |
dejared_list_classes | List classes in a specific package |
dejared_list_resources | List non-class resource files |
dejared_read_resource | Read text resources (YAML, XML, properties, JSON, and others) |
Hunting
Search inside JAR files.
| Tool | Description |
|---|---|
dejared_search_class | Search classes by name |
dejared_search_string | Search string literals in bytecode (URLs, SQL, error messages) |
Deep Analysis
Inspect metadata and decompile classes.
| Tool | Description |
|---|---|
dejared_get_metadata | Extract class metadata via ASM (fast, no decompilation) |
dejared_dump_package_metadata | Batch metadata extraction for entire packages |
dejared_decompile_class | Decompile .class files to Java source code |
Decompiler Engines
dejared-mcp supports three decompiler engines. The engine can be
specified per request via the dejared_decompile_class tool.
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