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# Where to Store JWT Secrets: Env Vars vs Vault vs KMS

Choosing where to store your JWT secrets is one of the most consequential security decisions in your application architecture.

## Environment Variables

The simplest approach — store the secret in your deployment environment.

**Pros:**
- Zero infrastructure overhead
- Supported natively by every platform
- Easy local development setup

**Cons:**
- Secrets appear in process listings
- No automatic rotation
- Risk of accidental exposure in logs

**Best for:** Small projects, early-stage startups, simple deployments.

```bash
JWT_SECRET=your-256-bit-secret-here
```

## HashiCorp Vault

A dedicated secrets management platform with dynamic secrets, fine-grained access control, and audit logging.

**Pros:**
- Centralized secret management
- Automatic rotation with lease TTLs
- Full audit trail
- Dynamic secret generation

**Cons:**
- Significant operational overhead
- Requires dedicated infrastructure
- Learning curve for teams

**Best for:** Medium to large teams with dedicated DevOps/platform engineering capacity.

```javascript
const vault = require('node-vault')({ endpoint: 'https://vault.internal' });
const { data } = await vault.read('secret/jwt');
const secret = data.jwt_secret;
```

## Cloud KMS (AWS KMS, Google Cloud KMS, Azure Key Vault)

Managed key management services provided by cloud providers — keys never leave the HSM.

**Pros:**
- Hardware Security Module (HSM) backed
- No key material ever exposed
- Built-in rotation, auditing, and access control
- Compliance-ready (SOC2, HIPAA, PCI-DSS)

**Cons:**
- Latency on each signing operation
- Vendor lock-in
- Additional cost

**Best for:** Enterprise, regulated industries, high-security requirements.

## Recommendation

| Stage | Recommendation |
|-------|---------------|
| Development | Environment variables |
| Production (small) | Secrets manager (AWS Secrets Manager, Doppler) |
| Production (enterprise) | Cloud KMS with envelope encryption |

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