MongoDB Client Encryption

The Node.js wrapper for libmongocrypt

Note This library provides encryption functionality for the MongoDB Node.js driver, but is not intended to be consumed in isolation. The public API that uses the functionality in this library is available in the mongodb package.

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Only the following version combinations with the MongoDB Node.js Driver are considered stable.

| | mongodb-client-encryption@1.x | mongodb-client-encryption@2.x | mongodb-client-encryption@6.x | mongodb-client-encryption@7.x |
| ------------- | ------------------------------- | ------------------------------- | ------------------------------- | ------------------------------- |
| mongodb@7.x | N/A | N/A | N/A | ✓ |
| mongodb@6.x | N/A | N/A | ✓ | N/A |
| mongodb@5.x | N/A | ✓ | N/A | N/A |
| mongodb@4.x | ✓ | ✓ | N/A | N/A |
| mongodb@3.x | ✓ | N/A | N/A | N/A |

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You can install mongodb-client-encryption with the following:

``bash
npm install mongodb-client-encryption
`

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Releases are created automatically and signed using the Node team's GPG key. This applies to the git tag as well as all release packages provided as part of a GitHub release. To verify the provided packages, download the key and import it using gpg:

`
gpg --import node-driver.asc
`

The GitHub release contains a detached signature file for the NPM package (named
mongodb-client-encryption-X.Y.Z.tgz.sig).

The following command returns the link npm package.
`shell
npm view mongodb-client-encryption@vX.Y.Z dist.tarball
`

Using the result of the above command, a curl command can return the official npm package for the release.

To verify the integrity of the downloaded package, run the following command:
`shell
gpg --verify mongodb-client-encryption-X.Y.Z.tgz.sig mongodb-client-encryption-X.Y.Z.tgz
`

>[!Note]
No verification is done when using npm to install the package. The contents of the Github tarball and npm's tarball are identical.

To verify the native .node packages, follow the same steps as above using mongodb-client-encryption-X.Y.Z-platform.tgz and the corresponding .sig file.

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#### Setup


Run the following command to build libmongocrypt and you are setup to develop the node bindings:

`shell
npm run install:libmongocrypt
`

#### libmongocrypt.mjs

`
node libmongocrypt.mjs [optional flags]

By default attempts to download and compile the bindings with the crypto prebuilds of libmongocrypt.
Can be configured to clone and build without crypto.

--gitURL=string A custom remote git repository to clone libmongocrypt from. You must also set --build to use this.
--libVersion=string A custom version reference to either download or checkout after cloning.
You may use "latest" to get current libmongocrypt HEAD.
--clean Combined with --build, the script will not skip cloning and rebuilding libmongocrypt.
--build Instead of downloading, clone and build libmongocrypt along with the bindings.
--dynamic Skips cloning or downloading libmongocrypt, runs prebuild with build_type set to "dynamic" to compile
a prebuild that links to a system copy of libmongocrypt.
--skip-bindings Skips running prebuild. Useful if only the libmongocrypt dependency is desired.

Only suitable for local development:

--fastDownload If you are improving this script or otherwise repeatedly downloading libmongocrypt,
this flag will interrupt the un-tar operation as early as possible. It should work, most of the time.
`

#### Prebuild Platforms

Below are the platforms that are available as prebuilds on each github release.
prebuild-install downloads these automatically depending on the platform you are running npm install on.

- Linux GLIBC 2.28 or later
- s390x
- arm64
- x64
- Linux MUSL 1.1.20
- arm64
- x64
- MacOS universal binary
- x64
- arm64
- Windows
- x64

#### Linting

We lint both the c++ bindings and the Typescript.

To lint the Typescript, you can run npm run check:eslint -- --fix. To lint the c++, run npm run clang-format.

#### Testing

The unit tests require the binding to be built. Run npm run rebuild to build the addon from the c++ source. Then the tests can be run with npm test`.

Note: changes to c++ source are not automatically re-compiled. One needs to rebuild the bindings after each change.