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wtf is node-memwatch?

deepak1556/node-memwatch — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2022-12-29

★ 6C++Audience · developerComplexity · 3/5DormantSetup · moderate

TL;DR

node-memwatch monitors a Node.js app's memory over time and alerts you to leaks, with a HeapDiff tool to pinpoint exactly what's not being cleaned up.

Mindmap

mindmap
  root((node-memwatch))
    What it does
      Detects memory leaks
      Tracks GC cycles
      HeapDiff snapshots
    Tech stack
      C++
      Node.js
      V8 garbage collector
    Use cases
      Debug long-running servers
      Compare memory snapshots
      Catch leaks early
    Audience
      Backend developers
      Ops engineers
    Notable
      Leak alerts
      Object type breakdown

Code map

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filefunction / class

Why would anyone build with this?

REASON 1

Monitor a long-running Node.js server for gradual memory growth.

REASON 2

Take before-and-after HeapDiff snapshots around a suspect function to find leaked objects.

REASON 3

Set up leak alerts so you catch a growing memory footprint before production crashes.

REASON 4

Track memory usage trends over weeks on a chat or data-processing service.

What's in the stack?

C++Node.js

How it stacks up

deepak1556/node-memwatchkeyan/ev_routing_enginesiddontang/tpush
Stars655
LanguageC++C++C++
Last pushed2022-12-292021-03-192013-11-05
MaintenanceDormantDormantDormant
Setup difficultymoderatemoderatehard
Complexity3/54/54/5
Audiencedeveloperdeveloperdeveloper

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

How do you spin it up?

Difficulty · moderate Time to first run · 30min

Native C++ addon, requires a build toolchain to compile for your Node.js version.

The README does not specify license details.

Yoink these prompts

Prompt 1
Show me how to use node-memwatch's HeapDiff to compare memory snapshots before and after running a function.
Prompt 2
Set up node-memwatch to alert me when my Node.js server's memory usage keeps growing across GC cycles.
Prompt 3
Explain what a HeapDiff report from node-memwatch is telling me about leaked objects.
Prompt 4
Help me integrate node-memwatch into a long-running Node.js chat server to catch leaks early.

Frequently asked questions

wtf is node-memwatch?

node-memwatch monitors a Node.js app's memory over time and alerts you to leaks, with a HeapDiff tool to pinpoint exactly what's not being cleaned up.

What language is node-memwatch written in?

Mainly C++. The stack also includes C++, Node.js.

Is node-memwatch actively maintained?

Dormant — no commits in 2+ years (last push 2022-12-29).

What license does node-memwatch use?

The README does not specify license details.

How hard is node-memwatch to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is node-memwatch for?

Mainly developer.

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