NOMYO.js — Secure JavaScript Chat Client

OpenAI-compatible secure chat client with end-to-end encryption for NOMYO Inference Endpoints

• All prompts and responses are automatically encrypted and decrypted
• Hybrid encryption: AES-256-GCM payload + RSA-OAEP-SHA256 key exchange, 4096-bit keys
• Drop-in replacement for OpenAI's ChatCompletion API
• Works in both Node.js and browsers

Quick Start

Installation

npm install nomyo-js

Basic Usage (Node.js)

import { SecureChatCompletion } from 'nomyo-js';

const client = new SecureChatCompletion({
  apiKey: process.env.NOMYO_API_KEY,
});

const response = await client.create({
  model: 'Qwen/Qwen3-0.6B',
  messages: [{ role: 'user', content: 'Hello!' }],
  temperature: 0.7,
});

console.log(response.choices[0].message.content);
client.dispose();

Basic Usage (Browser)

<script type="module">
  import { SecureChatCompletion } from 'https://unpkg.com/nomyo-js/dist/browser/index.js';

  const client = new SecureChatCompletion({
    baseUrl: 'https://api.nomyo.ai',
    apiKey:  'your-api-key',
  });

  const response = await client.create({
    model: 'Qwen/Qwen3-0.6B',
    messages: [{ role: 'user', content: 'What is 2+2?' }],
  });

  console.log(response.choices[0].message.content);
</script>

Documentation

Full documentation is in the doc/ directory:

• Getting Started — walkthrough for new users
• API Reference — complete constructor options, methods, types, and error classes
• Models — available models and selection guide
• Security Guide — encryption, memory protection, key management, compliance
• Rate Limits — limits, automatic retry behaviour, batch throttling
• Examples — 12+ code examples for common scenarios
• Troubleshooting — error reference and debugging tips

Security Features

Hybrid Encryption

• Payload encryption: AES-256-GCM (authenticated encryption)
• Key exchange: RSA-OAEP-SHA256
• Key size: 4096-bit RSA keys
• Scope: All communication is end-to-end encrypted

Key Management

• Ephemeral by default: A fresh key pair is generated in memory on first use and never written to disk. Set keyDir to persist and reuse keys across runs (Node.js only); existing keys in that directory are reloaded automatically.
• Password protection: Optional AES-encrypted private key files (minimum 8 characters).
• Secure permissions: Private key files saved at 0600 (owner-only).
• Auto-rotation: Keys rotate every 24 hours by default (configurable via keyRotationInterval).
• Explicit lifecycle: Call dispose() to zero in-memory key material and stop the rotation timer.

Secure Memory

The library wraps all intermediate sensitive buffers (AES keys, plaintext payload, decrypted bytes) in SecureByteContext, which zeroes them in a finally block immediately after use.

Pure JavaScript cannot lock pages to prevent OS swapping (mlock). For environments where swap-file exposure is unacceptable, install the optional nomyo-native addon. Check the current protection level:

import { getMemoryProtectionInfo } from 'nomyo-js';

const info = getMemoryProtectionInfo();
// Without addon: { method: 'zero-only', canLock: false }
// With addon:    { method: 'mlock',     canLock: true  }

Security Tiers

Pass security_tier per request to route inference to increasingly isolated hardware:

Tier	Hardware	Use case
"standard"	GPU	General secure inference
"high"	CPU/GPU balanced	Sensitive business data
"maximum"	CPU only	HIPAA PHI, classified data

const response = await client.create({
  model:         'Qwen/Qwen3-0.6B',
  messages:      [{ role: 'user', content: 'Patient record summary...' }],
  security_tier: 'maximum',
});

Usage Examples

With API Key

const client = new SecureChatCompletion({ apiKey: process.env.NOMYO_API_KEY });

Error Handling

import {
  SecureChatCompletion,
  AuthenticationError,
  RateLimitError,
  ForbiddenError,
} from 'nomyo-js';

try {
  const response = await client.create({ model: 'Qwen/Qwen3-0.6B', messages: [...] });
} catch (err) {
  if (err instanceof AuthenticationError) console.error('Check API key:', err.message);
  else if (err instanceof RateLimitError)    console.error('Rate limit hit:', err.message);
  else if (err instanceof ForbiddenError)    console.error('Model/tier mismatch:', err.message);
  else throw err;
}

Per-Request Router Override

Send a single request to a different router without changing the main client:

const response = await client.create({
  model:    'Qwen/Qwen3-0.6B',
  messages: [{ role: 'user', content: 'Hello from secondary router' }],
  base_url: 'https://secondary.nomyo.ai:12435',  // temporary — main client unchanged
});

Tool / Function Calling

const response = await client.create({
  model:    'Qwen/Qwen3-0.6B',
  messages: [{ role: 'user', content: "What's the weather in Paris?" }],
  tools: [
    {
      type: 'function',
      function: {
        name:        'get_weather',
        description: 'Get weather information for a location',
        parameters: {
          type: 'object',
          properties: { location: { type: 'string' } },
          required: ['location'],
        },
      },
    },
  ],
  tool_choice: 'auto',
});

Thinking Models

const response = await client.create({
  model:    'LiquidAI/LFM2.5-1.2B-Thinking',
  messages: [{ role: 'user', content: 'Is 9.9 larger than 9.11?' }],
});

const { content, reasoning_content } = response.choices[0].message;
console.log('Reasoning:', reasoning_content);
console.log('Answer:',    content);

Resource Management

const client = new SecureChatCompletion({ apiKey: process.env.NOMYO_API_KEY });

try {
  const response = await client.create({ model: 'Qwen/Qwen3-0.6B', messages: [...] });
  console.log(response.choices[0].message.content);
} finally {
  client.dispose();  // zeros key material, stops rotation timer
}

Local Development (HTTP)

const client = new SecureChatCompletion({
  baseUrl:   'http://localhost:12435',
  allowHttp: true,  // required — also prints a visible warning
});

API Reference

SecureChatCompletion — Constructor Options

new SecureChatCompletion(config?: ChatCompletionConfig)

Option	Type	Default	Description
baseUrl	string	'https://api.nomyo.ai'	NOMYO router URL. Must be HTTPS in production.
allowHttp	boolean	false	Allow HTTP connections. Local development only.
apiKey	string	undefined	Bearer token for Authorization header.
secureMemory	boolean	true	Zero sensitive buffers immediately after use.
timeout	number	60000	Request timeout in milliseconds.
debug	boolean	false	Print verbose logging to the console.
keyDir	string | null	null	Directory to load/save RSA keys on startup. Omit for ephemeral in-memory keys that are never written to disk. Node.js only.
keyRotationInterval	number	86400000	Auto-rotate keys every N ms. 0 disables rotation.
keyRotationDir	string	keyDir	Directory for rotated key files. Rotated keys are only persisted when keyDir or keyRotationDir is set. Node.js only.
keyRotationPassword	string	undefined	Password for encrypted rotated key files.
maxRetries	number	2	Extra retry attempts on 429/5xx/network errors. Exponential backoff (1 s, 2 s, …).

Methods

• create(request): Promise<ChatCompletionResponse> — send an encrypted chat completion
• acreate(request): Promise<ChatCompletionResponse> — alias for create()
• dispose(): void — zero key material and stop the rotation timer

create() Request Fields

All standard OpenAI fields (model, messages, temperature, top_p, max_tokens, stop, n, tools, tool_choice, user, frequency_penalty, presence_penalty, logit_bias) plus:

Field	Description
security_tier	"standard" | "high" | "maximum" — hardware isolation level
api_key	Per-request API key override
base_url	Per-request router URL override — creates a temporary client, used once, then disposed

SecureCompletionClient — Constructor Options

Lower-level client. All options above apply, with these differences:

Option	Type	Default	Description
routerUrl	string	'https://api.nomyo.ai'	Base URL (baseUrl is renamed here)
keySize	2048 | 4096	4096	RSA modulus length

Methods

• generateKeys(options?) — generate a new RSA key pair
• loadKeys(privateKeyPath, publicKeyPath?, password?) — load existing PEM files
• fetchServerPublicKey() — fetch the server's RSA public key
• encryptPayload(payload) — encrypt a request payload
• decryptResponse(encrypted, payloadId) — decrypt a response body
• sendSecureRequest(payload, payloadId, apiKey?, securityTier?) — full encrypt → POST → decrypt cycle
• dispose() — zero key material and stop rotation timer

Secure Memory Public API

import {
  getMemoryProtectionInfo,
  disableSecureMemory,
  enableSecureMemory,
  SecureByteContext,
} from 'nomyo-js';

Export	Description
getMemoryProtectionInfo()	Returns { method, canLock, isPlatformSecure, details? }
disableSecureMemory()	Disable global secure-memory zeroing
enableSecureMemory()	Re-enable global secure-memory zeroing
SecureByteContext	Low-level buffer wrapper — zeros in finally block

Error Classes

import {
  AuthenticationError, InvalidRequestError, RateLimitError,
  ForbiddenError, ServerError, ServiceUnavailableError,
  APIConnectionError, SecurityError, DisposedError, APIError,
} from 'nomyo-js';

Class	HTTP	Thrown when
AuthenticationError	401	Invalid or missing API key
InvalidRequestError	400	Malformed request
ForbiddenError	403	Model not allowed for the security tier
RateLimitError	429	Rate limit exceeded (after all retries)
ServerError	500	Internal server error (after all retries)
ServiceUnavailableError	503	Backend unavailable (after all retries)
APIError	varies	Other HTTP errors
APIConnectionError	—	Network failure or timeout (after all retries)
SecurityError	—	HTTPS not used, header injection, or crypto failure
DisposedError	—	Method called after dispose()

Platform Support

Node.js

• Minimum: Node.js 22.22.2+
• Recommended: Node.js 22 LTS or later
• Key storage: File system (keyDir directory, default client_keys/)

Browsers

• Supported: Chrome 37+, Firefox 34+, Safari 11+, Edge 79+
• Key storage: In-memory only (not persisted)
• Limitation: File-based key operations (keyDir, loadKeys) are not available

Security Best Practices

• Always use HTTPS (allowHttp is false by default)
• Load API key from an environment variable, never hardcode it
• Use password-protected key files (keyRotationPassword)
• Store keys outside the project directory and outside version control
• Add client_keys/ and *.pem to .gitignore
• Call dispose() when the client is no longer needed
• Use security_tier: 'maximum' for HIPAA PHI or classified data
• Consider the nomyo-native addon if swap-file exposure is unacceptable

License

See LICENSE file.