# Streamparse Mcp

> Parse partial / truncated / messy JSON for LLM tool calls and structured outputs.

- **Type:** MCP server
- **Install:** `agentstack add mcp-mukundakatta-streamparse-mcp`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [MukundaKatta](https://agentstack.voostack.com/s/mukundakatta)
- **Installs:** 0
- **Category:** [AI & ML](https://agentstack.voostack.com/c/ai-and-ml)
- **Latest version:** 1.0.1
- **License:** MIT
- **Upstream author:** [MukundaKatta](https://github.com/MukundaKatta)
- **Source:** https://github.com/MukundaKatta/streamparse-mcp

## Install

```sh
agentstack add mcp-mukundakatta-streamparse-mcp
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# streamparse-mcp

[](https://www.npmjs.com/package/@mukundakatta/streamparse-mcp)
[](#)
[](https://modelcontextprotocol.io)

An [MCP](https://modelcontextprotocol.io) server that gives AI assistants the
ability to parse partial / messy / truncated JSON.

Built on top of [`@mukundakatta/streamparse`](https://github.com/MukundaKatta/streamparse).
Works with Claude Desktop, Cursor, Cline, Windsurf, Zed, and any other MCP client.

## Tools exposed

### `parse_partial_json`

Recover a JSON value from a possibly-truncated string. Always returns a valid
value with synthetic closure of any open strings, arrays, or objects.

```json
{
  "text": "{\"type\":\"tool_use\",\"name\":\"edit_file\",\"input\":{\"path\":\"a/b.ts\",\"cont"
}
```

→

```json
{
  "value": {
    "type": "tool_use",
    "name": "edit_file",
    "input": { "path": "a/b.ts", "cont": null }
  },
  "complete": false,
  "path": ["input", "cont"],
  "bytes_consumed": 67,
  "confidence": 0.65
}
```

### `extract_json_from_text`

Strip prose, ` ```json ` fences, and comments around a JSON value embedded in
LLM output. Returns the first parseable value.

```
Sure, here you go:
```json
{ "answer": 42 }
```
Let me know!
```

→ `{ "answer": 42 }`

### `validate_json`

Strict-mode RFC 8259 validator. Returns `ok=true` and the parsed value on
success, or `ok=false` with a precise byte position and error message on
failure.

## Install

### Claude Desktop

Add to `claude_desktop_config.json`:

```json
{
  "mcpServers": {
    "streamparse": {
      "command": "npx",
      "args": ["-y", "@mukundakatta/streamparse-mcp"]
    }
  }
}
```

### Cursor / Cline / Windsurf / Zed

Same shape, in the appropriate `mcp.json` for your client. Most clients
auto-discover via `npx -y @mukundakatta/streamparse-mcp`.

### Local install

```bash
npm install -g @mukundakatta/streamparse-mcp
mcp-streamparse        # listens on stdio
```

## Why this matters

When an LLM is mid-tool-call and you need the assistant to reason about the
half-formed JSON it just wrote, no other tool gives a usable answer. Standard
`JSON.parse` throws. Regex extraction misses nested structure. This MCP server
gives Claude (or whichever model is driving) a real handle on partial JSON,
right where it lives.

## License

MIT.

## Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [MukundaKatta](https://github.com/MukundaKatta)
- **Source:** [MukundaKatta/streamparse-mcp](https://github.com/MukundaKatta/streamparse-mcp)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v1.0.1 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **1.0.1** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/mcp-mukundakatta-streamparse-mcp
- Seller: https://agentstack.voostack.com/s/mukundakatta
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.