JavaScript heap out of memory

[hawksight]

I've recently had this error on Zenko Cloudserver:

<--- Last few GCs --->

[110:0x52ad1f0] 314544871 ms: Mark-sweep 993.6 (1019.3) -> 991.5 (1019.5) MB, 1297.0 / 0.0 ms  (average mu = 0.124, current mu = 0.052) allocation failure scavenge might not succeed
[110:0x52ad1f0] 314546247 ms: Mark-sweep 993.6 (1019.5) -> 991.5 (1019.5) MB, 1357.9 / 0.0 ms  (average mu = 0.071, current mu = 0.013) task scavenge might not succeed


<--- JS stacktrace --->

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
 1: 0xb00e10 node::Abort() [/usr/local/bin/node]
 2: 0xa1823b node::FatalError(char const*, char const*) [/usr/local/bin/node]
 3: 0xcee09e v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [/usr/local/bin/node]
 4: 0xcee417 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [/usr/local/bin/node]
 5: 0xea65d5  [/usr/local/bin/node]
 6: 0xea70b6  [/usr/local/bin/node]
 7: 0xeb4fee  [/usr/local/bin/node]
 8: 0xeb5a30 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [/usr/local/bin/node]
 9: 0xeb89ae v8::internal::Heap::AllocateRawWithRetryOrFailSlowPath(int, v8::internal::AllocationType, v8::internal::AllocationOrigin, v8::internal::AllocationAlignment) [/usr/local/bin/node]
10: 0xe79b12 v8::internal::Factory::AllocateRaw(int, v8::internal::AllocationType, v8::internal::AllocationAlignment) [/usr/local/bin/node]
11: 0xe72124 v8::internal::FactoryBase<v8::internal::Factory>::AllocateRawWithImmortalMap(int, v8::internal::AllocationType, v8::internal::Map, v8::internal::AllocationAlignment) [/usr/local/bin/node]
12: 0xe73e40 v8::internal::FactoryBase<v8::internal::Factory>::NewRawOneByteString(int, v8::internal::AllocationType) [/usr/local/bin/node]
13: 0x1250045 v8::internal::IncrementalStringBuilder::Extend() [/usr/local/bin/node]
14: 0xf9e810 v8::internal::JsonStringifier::SerializeString(v8::internal::Handle<v8::internal::String>) [/usr/local/bin/node]
15: 0xfa08a1 v8::internal::JsonStringifier::Result v8::internal::JsonStringifier::Serialize_<true>(v8::internal::Handle<v8::internal::Object>, bool, v8::internal::Handle<v8::internal::Object>) [/usr/local/bin/node]
16: 0xfa4301 v8::internal::JsonStringifier::Result v8::internal::JsonStringifier::Serialize_<false>(v8::internal::Handle<v8::internal::Object>, bool, v8::internal::Handle<v8::internal::Object>) [/usr/local/bin/node]
17: 0xfa2250 v8::internal::JsonStringifier::Result v8::internal::JsonStringifier::Serialize_<true>(v8::internal::Handle<v8::internal::Object>, bool, v8::internal::Handle<v8::internal::Object>) [/usr/local/bin/node]
18: 0xfa4301 v8::internal::JsonStringifier::Result v8::internal::JsonStringifier::Serialize_<false>(v8::internal::Handle<v8::internal::Object>, bool, v8::internal::Handle<v8::internal::Object>) [/usr/local/bin/node]
19: 0xfa53d1 v8::internal::JsonStringifier::SerializeArrayLikeSlow(v8::internal::Handle<v8::internal::JSReceiver>, unsigned int, unsigned int) [/usr/local/bin/node]
20: 0xfa41a4 v8::internal::JsonStringifier::Result v8::internal::JsonStringifier::Serialize_<false>(v8::internal::Handle<v8::internal::Object>, bool, v8::internal::Handle<v8::internal::Object>) [/usr/local/bin/node]
21: 0xfa5c1f v8::internal::JsonStringify(v8::internal::Isolate*, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>) [/usr/local/bin/node]
22: 0xd70427 v8::internal::Builtin_JsonStringify(int, unsigned long*, v8::internal::Isolate*) [/usr/local/bin/node]
23: 0x15e7dd9  [/usr/local/bin/node]
Aborted (core dumped)
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
error Command failed with exit code 134.
...
ERROR: "start_mdserver" exited with 134.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
{"name":"S3","time":1655125262842,"level":"info","message":"server shutting down","hostname":"zenko-cloudserver-ff9648f46-cxd5b","pid":71}

I'm looking to see if there are any environment variables I can set to scale up the "JavaScript heap out of memory"?
Or where I can even find where it's set or what fills it up.

In our implementation we are purely using an api to post a retrieve data from this service... so I'm not sure where Javascript plays a role in this.