nanvc

nanvc is a lightweight TypeScript client for the HashiCorp Vault HTTP API. It is built for Node.js applications that need typed Vault access without a large framework around secrets, auth, or infrastructure automation.

Use it for typed KV v1/KV v2 secret workflows, AppRole authentication, response wrapping, system policy helpers, database secrets, optional request logging, and raw Vault API calls when you need an escape hatch.

Full documentation: zailic.github.io/nanvc

Why nanvc

• Typed Vault client for TypeScript: exported request and response types for the v2 client surface.
• KV shortcuts that feel like the Vault CLI: read, write, delete, and list support KV v1 by default and KV v2 with { engineVersion: 2 }.
• Focused high-level APIs: helpers for AppRole, KV v1, KV v2, system policies, response wrapping, and database secrets.
• Raw API escape hatch: RawVaultClient lets you call unsupported Vault endpoints without leaving the same client setup.
• Result-based error handling: use tuple-style results or .unwrap(), .unwrapOr(), and related helpers.
• Production-friendly basics: ESM, Node.js >=20, optional TLS/mTLS, and opt-in request lifecycle logs.

Install

npm install nanvc

import { VaultClientV2 } from 'nanvc';
const vault = new VaultClientV2();
await vault.write('secret/apps/demo', { password: 's3cr3t' }).unwrap();
const secret = await vault.read<{ password: string }>('secret/apps/demo').unwrap();

Common Workflows

KV v2

await vault.write(
    'secret-v2',
    'apps/demo',
    { apiKey: 'dev-key' },
    { engineVersion: 2 },
).unwrap();

const value = await vault.read<{ apiKey: string }>(
    'secret-v2',
    'apps/demo',
    { engineVersion: 2 },
).unwrap();

For the full versioned KV workflow, including patch, metadata, history, soft-delete, undelete, destroy, automatic deletion, and CAS examples, see the versioned KV guide.

AppRole

const login = await vault.auth.loginWithAppRole({
    role_id: process.env.VAULT_ROLE_ID,
    secret_id: process.env.VAULT_SECRET_ID,
}).unwrap();

See the runnable VaultClientV2 AppRole example.

Response Wrapping

const wrapped = await vault.sys.wrapping.wrap(
    { role_id: '...', secret_id: '...' },
    '5m',
).unwrap();

const unwrapped = await vault.sys.wrapping.unwrap(wrapped.wrap_info.token).unwrap();

See the request wrapping example.

Database Secrets

await vault.secret.db.configureConnection('database', 'postgres', {
    plugin_name: 'postgresql-database-plugin',
    connection_url: 'postgresql://{{username}}:{{password}}@localhost/postgres',
    allowed_roles: ['readonly'],
}).unwrap();

const creds = await vault.secret.db.generateCredentials('database', 'readonly').unwrap();

Error Handling

VaultClientV2 and RawVaultClient return a promise-like Result<T>. You can use tuple-style handling:

const [secret, error] = await vault.read<{ password: string }>('secret/apps/demo');

if (error) {
    console.error(error.message);
} else {
    console.log(secret.password);
}

Or use helpers:

const secret = await vault.read<{ password: string }>('secret/apps/demo').unwrap();
const fallback = await vault.read('secret/missing').unwrapOr({ password: 'fallback' });

Read more in the error handling guide.

Raw Vault API

When a high-level helper does not cover an endpoint yet, call Vault directly:

const info = await vault.raw.get('/sys/host-info').unwrap();

See the VaultClientV2 API reference for the full typed surface.

Logging

Logging is disabled by default. Enable request lifecycle logs with:

NANVC_LOG_LEVEL=debug node app.js

Supported levels are error, warn, info, and debug. Logs include method, URL, status, and duration, but never tokens or request/response bodies.

Client Versions

New development is focused on VaultClientV2, the typed client built on RawVaultClient. The original VaultClient remains available for compatibility and for optional mTLS support.

Original client documentation:

• VaultClient v1 API
• Original AppRole example

CommonJS consumers can load this ESM-only package with dynamic import():

const { VaultClientV2 } = await import('nanvc');

Links

• Documentation
• Getting started
• Examples
• Changelog
• Issues

Requirements

• Node.js >=20
• ESM project or dynamic import() from CommonJS

License

MIT