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wtf is 0x?

kazarmy/0x — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2022-06-20

Audience · developerComplexity · 2/5DormantSetup · easy

TL;DR

A tool that profiles your Node.js app while it runs and turns the results into an interactive flamegraph so you can see exactly what's slowing your code down.

Mindmap

mindmap
  root((0x))
    What it does
      Records CPU time
      Generates flamegraph
      Interactive HTML output
    Tech stack
      Node.js
    Use cases
      Debug slow REST API
      Profile data pipelines
      Optimize background workers
    Audience
      Node.js developers
      Backend engineers
    Platforms
      macOS
      Linux
      Windows
      Android

Code map

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filefunction / class

Why would anyone build with this?

REASON 1

Find which function is consuming the most CPU time in a slow REST API.

REASON 2

Profile a data processing script to see where time is actually being spent.

REASON 3

Diagnose a slow background worker without adding any manual instrumentation.

REASON 4

Share a self-contained HTML flamegraph with teammates to discuss a performance bottleneck.

What's in the stack?

Node.js

How it stacks up

kazarmy/0x0verflowme/alarm-clock0verflowme/seclists
Language—CSS—
Last pushed2022-06-202022-10-032020-05-03
MaintenanceDormantDormantDormant
Setup difficultyeasyeasyeasy
Complexity2/52/51/5
Audiencedevelopervibe coderops devops

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · easy Time to first run · 5min

Just run your app through the 0x command, no code changes or instrumentation needed.

No license information was found in the explanation.

Yoink these prompts

Prompt 1
Show me how to run 0x against my Node.js app to generate a flamegraph and find the slowest function.
Prompt 2
Explain how to read a 0x flamegraph so I can tell whether my API's slowness comes from database calls or CPU-bound code.
Prompt 3
Help me profile my REST API with 0x while a load-testing tool sends it realistic traffic.
Prompt 4
Walk me through using 0x on a production server without disrupting the running application.

Frequently asked questions

wtf is 0x?

A tool that profiles your Node.js app while it runs and turns the results into an interactive flamegraph so you can see exactly what's slowing your code down.

Is 0x actively maintained?

Dormant — no commits in 2+ years (last push 2022-06-20).

What license does 0x use?

No license information was found in the explanation.

How hard is 0x to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is 0x for?

Mainly developer.

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