NodeJS - JavaScript heap out of memory

Problem

When running the SeaLights NodeJS agent, the error "JavaScript heap out of memory" is encountered.

Solution

By default node is limited in the amount of memory it is allocated, and sometimes the SeaLights node agent requires more memory that what was allocated. More memory can be allocated by using the max-old-space-size flag.

The flag can be passed either by using the NODE_OPTION environment variable, for example:

Linux

export NODE_OPTIONS=--max-old-space-size=4096

Windows

Alternatively, it can be passed directly to node process running the SeaLights agent, for example:

node --max-old-space-size=4096 ./node_modules/.bin/slnodejs scan ...

To show the current max heap size being used by Node.js at runtime (after accounting for NODE_OPTIONS or any CLI overrides), you can execute:

node -p "v8.getHeapStatistics().heap_size_limit / 1024 / 1024 + ' MB'"

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