memory-leak-debugging

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Diagnoses and resolves memory leaks in JavaScript/Node.js applications. Use when a user reports high memory usage, OOM errors, or wants to analyze heapsnapshots or run memory leak detection tools like memlab.

2installs

Sourcechromedevtools/chrome-devtools-mcp

Added on2026-03-27

NPX Install

npx skill4agent add chromedevtools/chrome-devtools-mcp memory-leak-debugging

SKILL.md Content

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Memory Leak Debugging

This skill provides expert guidance and workflows for finding, diagnosing, and fixing memory leaks in JavaScript and Node.js applications.

Core Principles

Prefer
memlab
: Do NOT attempt to read raw
```
.heapsnapshot
```
files directly, as they are extremely large and will consume too many tokens. Always recommend and use
```
memlab
```
to process snapshots and identify leak traces.
Isolate the Leak: Determine if the leak is in the browser (client-side) or Node.js (server-side).
Common Culprits: Look for detached DOM nodes, unhandled closures, global variables, event listeners not being removed, and caches growing unbounded. Note: Detached DOM nodes are sometimes intentional caches; always ask the user before nulling them.

Workflows

1. Capturing Snapshots

When investigating a frontend web application memory leak, utilize the

chrome-devtools-mcp

tools to interact with the application and take snapshots.

Use tools like
```
click
```
,
```
navigate_page
```
,
```
fill
```
, etc., to manipulate the page into the desired state.
Revert the page back to the original state after interactions to see if memory is released.
Repeat the same user interactions 10 times to amplify the leak.
Use
```
take_memory_snapshot
```
to save
```
.heapsnapshot
```
files to disk at baseline, target (after actions), and final (after reverting actions) states.

2. Using Memlab to Find Leaks (Recommended)

Once you have generated

.heapsnapshot

files using

take_memory_snapshot

, use

memlab

to automatically find memory leaks.

Read references/memlab.md for how to use
```
memlab
```
to analyze the generated heapsnapshots.
Do not read raw
```
.heapsnapshot
```
files using
```
read_file
```
or
```
cat
```
.

3. Identifying Common Leaks

When you have found a leak trace (e.g., via

memlab

output), you must identify the root cause in the code.

Read references/common-leaks.md for examples of common memory leaks and how to fix them.

4. Fallback: Comparing Snapshots Manually

If

memlab

is not available, you MUST use the fallback script in the references directory to compare two

.heapsnapshot

files and identify the top growing objects and common leak types.

Run the script using Node.js:

bash

node compare_snapshots.js <baseline.heapsnapshot> <target.heapsnapshot>

The script will analyze and output the top growing objects by size and highlight the 3 most common types of memory leaks (e.g., Detached DOM nodes, closures, Contexts) if they are present.