v2.1.0

• Add function name hints to hot lines section.
• Output suggestions when --stacks <function_name> doesn't return any matches.

v2.0.0

This project used to be about generating an HTML flamegraph for Node traces, but then lay dormant since 2018. In 2026, as of v2.0.0, it is revived with a new purpose: to be a useful CLI tool in the age of AI.

Flamebearer is now a CLI that summarizes CPU traces for AI agents and humans, designed for JavaScript performance optimization loops. Reads Chrome DevTools Performance recordings (.json / .json.gz) and Node .cpuprofile files,
and prints a compact, structured text summary — top CPU offenders, hot source lines, long tasks, with a way to drill down further.

npm install -g flamebearer

# Profile a Node script (wraps `node --cpu-prof`)
flamebearer-node bench.js

# Summarize a Chrome DevTools or node --cpu-prof trace
flamebearer profile.json.gz
flamebearer CPU.*.cpuprofile

v1.1.3

• Added a tooltip. (Thanks @ibesora!)
• Fixed a bug that could hide some bars after zooming.

v1.1.2

• Style tweaks and better experience on mobile.
• Slightly improved hover performance.

v1.1.1

• Add a missing file in the NPM package.

v1.1.0

• Added a search field.
• Added browser history support (back/forward buttons).
• Cleaner UI.

v1.0.2

• Reduced resulting HTML size (~20% smaller, gzipped ~35% smaller)
• Reduced noise in the graph (by converting absolute file paths to relative ones)

v1.0.1

• Fix command line tool breaking on really big logs.
• Add engines field to indicate this can only be used on Node v8.5.0+.

v1.0.0

First release.