jaguardb

The simplest in-process database for Node.js that could possible work.
v0.1.3 URL: https://unpkg.com/jaguardb@0.1.3/index.js
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databaseembeddedin-processsmalldatabase for node.jsembedded database for node.jsjavascript database for node.js

wise-json-db

Blazing fast, crash-proof embedded JSON database for Node.js with batch operations, TTL, indexes, and segmented checkpointing.
v5.5.0 URL: https://unpkg.com/wise-json-db@5.5.0/wise-json/index.js
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jsondatabasedbnodejsembeddedfile-basednosqlsafecheckpointwalwisejsonsegmentfsynctransactionacidpersistencefastlightweightttlindexbatchdurablelocalstorageatomicrecoveryjavascriptnpm

slimcryptdb

A minimalist, ultra-secure embedded database for Node.js applications
v2.2.2 URL: https://unpkg.com/slimcryptdb@2.2.2/dist/SlimCryptDB.min.js
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databaseencryptionembeddedlightweightsecuritynosqljsonedge-computingiotserverlessaes-256-gcmwalacidtransactions

nestdb

The JavaScript Database for Node.js, nwjs, Electron, and the browser
v2.0.0 URL: https://unpkg.com/nestdb@2.0.0/index.js
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databasedatastoreembeddednestednestdbnedbnedb2nedb3nedb-corenewdbmongo-litemongodb-lite

@seald-io/nedb

File-based embedded data store for node.js
v4.1.1 URL: https://unpkg.com/@seald-io/nedb@4.1.1/index.js
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databasedatastoreembedded