ccf

Watch Claude Code JSONL output files and emit structured events as a Node.js EventEmitter.

Install

npm install @lanmower/ccf

Usage

import { watch } from '@lanmower/ccf';

const watcher = watch()
  .on('conversation_created', ({ conversation }) => {
    console.log('New session:', conversation.title);
  })
  .on('streaming_progress', ({ block, role }) => {
    if (block.type === 'text') process.stdout.write(block.text);
  })
  .on('streaming_complete', ({ conversationId }) => {
    console.log('Done:', conversationId);
  });

process.on('SIGINT', () => watcher.stop());

CommonJS:

const { watch, JsonlWatcher } = require('@lanmower/ccf');

API

watch(projectsDir?) → JsonlWatcher

Creates and starts a watcher. projectsDir defaults to ~/.claude/projects.

new JsonlWatcher(projectsDir?)

Class constructor. Call .start() manually after attaching listeners.

watcher.start() → this

Scans for existing .jsonl files and begins watching. Chainable.

watcher.stop()

Closes file descriptors and directory watcher.

Events

Event	Payload
conversation_created	{ conversation: { id, title, cwd }, timestamp }
streaming_start	{ conversationId, conversation, timestamp }
streaming_progress	{ conversationId, conversation, block, role, seq, timestamp }
streaming_complete	{ conversationId, conversation, seq, timestamp }
streaming_error	{ conversationId, error, recoverable, timestamp }
error	Error

block.type values: text, tool_use, tool_result, system, result, etc.

Requirements

Node >= 18. Zero external dependencies.

License

MIT