# @bcc-code/db_masker

> Db Masker is a library for masking database data by performing updates on the data and optionally removing it. The updates and removals are specified in yaml configuration files.

Latest version **0.4.1** (published 2026-09-17) · ISC license · 0 weekly downloads

## Install

```sh
npm install @bcc-code/db_masker
pnpm add @bcc-code/db_masker
yarn add @bcc-code/db_masker
bun add @bcc-code/db_masker
```

Provides the commands `db_masker`, `db_masker_cjs`.

## Health

**Score 60/100 (C)** — status: active.

Positive: esm support; no vulnerabilities; recently updated; high maintenance score.

Warnings: low downloads; no types; pre 1.0.

## Facts

| | |
|---|---|
| Version | 0.4.1 |
| Published | 2026-09-17 |
| First published | 2023-02-08 |
| Weekly downloads | 0 |
| License | ISC |
| TypeScript types | none |
| Module format | ESM + CommonJS |
| Node | ^20.19.0 \|\| ^22.13.0 \|\| >=24.0.0 |
| Dependencies | 5 |
| Unpacked size | 33.5 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 0 |
| Author | Gerard Lamusse |
| Maintainers | karsten.kuepper, nbogdan, it.accounts, adelinn, laurensgroeneveld, u12206050, jakubc-projects |
| Keywords | anonymiser, anonymizer, mysql, postgres, faker, knex |

## Links

- npm: https://www.npmjs.com/package/@bcc-code/db_masker
- Repository: https://github.com/bcc-code/db_masker
- Homepage: https://github.com/bcc-code/db_masker#readme
- Issues: https://github.com/bcc-code/db_masker/issues
- npm.io page: https://npm.io/package/@bcc-code/db_masker

## Dependencies (5)

- [knex](https://npm.io/package/knex.md) ^3.3.0
- [js-yaml](https://npm.io/package/js-yaml.md) ^5.4.2
- [fs-extra](https://npm.io/package/fs-extra.md) ^11.4.0
- [lodash-es](https://npm.io/package/lodash-es.md) ^4.18.1
- [@faker-js/faker](https://npm.io/package/@faker-js/faker.md) ^10.6.0

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## Recent versions

- 0.4.1 (latest) — 2026-09-17
- 0.4.0 — 2024-06-06
- 0.3.1 — 2024-03-21
- 0.3.0 — 2024-03-18
- 0.2.5 — 2023-07-21
- 0.2.4 — 2023-06-27
- 0.2.3 — 2023-02-16
- 0.2.2 — 2023-02-16
- 0.2.0 — 2023-02-08

## README

# Db Masker

Db Masker is a library for masking database data by performing updates on the data and optionally removing it. The updates and removals are specified in yaml configuration files.

### Supports

- Postgres
- MySQL / MySQL2
- SQLite

Install the correspond client library to use the database.

## Configuring Db Masker
To configure Db Masker, you'll need to set up the following:

The database connection information in the db-masker-config.yaml file.
```yaml
tasksDir: "./tasks" # relative to the config file
client: "pg"
connection:
  host: "127.0.0.1"
  user: "user"
  password: "password"
  database: "database"
```

Alternatively, a js file can be used to configure the database connection. The js file should export a function that returns the configuration object. The function will be passed the environment variable `NODE_ENV` as an argument. This allows you to configure the database connection based on the environment.

```js
module.exports = (env) => {
  return {
    tasksDir: "./tasks",
    client: "pg", // or mysql or sqlite3
    connection: () => {
      // return connection settings
    },
  }
}
```

The data updates and removals in one or more yaml files in the `tasks` directory. Each file corresponds to a namespace, and the data updates and removals are specified by table.

Here's an example of a yaml file:

```yaml
[namespace]: # A single namespace per config file
  [table]: # The exact table name on which to take actions (Can have multiple tables per namespace)
    id: "column_name" #(optional default: id) The column name that is the primary key for the table
    delete: true #(optional) remove all data from the table ( can also be a raw where clause eg. "column_name2 > 100" )
    updates:
      - column: "column_name"
        fn: "person.firstName" # use the faker function person.firstName to update the column
      - column: "column_name2"
        fn: "number.int" # use the faker function number.int to update the column
        args: [{ min: 1, max: 100 }] # pass options to the function
      - column: "column_name3"
        fn: "raw" # use the raw sql to update the column
        query: "CONCAT(column_name, ' ', column_name2)"
```

[https://fakerjs.dev/api/](https://fakerjs.dev/api/) has a list of all the faker functions that can be used. REMEMBER THE NAMESPACE IS REQUIRED, eg. `internet.email`

Note: Faker v10 renamed some namespaces (`name.*` → `person.*`, `address.*` → `location.*`) and removed `mersenne.rand` (use `number.int` instead).

## Usage

To run Db Masker, run the following command in your terminal:

```bash
npx db_masker db-masker-config.yaml
```

This will mask the data in your database according to the specifications in the yaml configuration files. The output will be logged to the console, and the process will exit with a status code of 0 on success or 1 on failure.

---
_Source: https://npm.io/package/@bcc-code/db_masker · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._