How to Secure ElevenLabs API Keys in a Node.js App

Keep your ElevenLabs API key on the server, load it into Node.js from managed secret storage at runtime, and send it to ElevenLabs in the xi-api-key header. Never put a long-lived key in browser code, a mobile app, a frontend bundle, or a public repository.

Keep the key behind your backend

An ElevenLabs API key is a secret credential: requests use it for authentication and to track API usage. ElevenLabs explicitly warns: “Your API key is a secret. Do not share it with others or expose it in any client-side code (browsers, apps).” See ElevenLabs API authentication.

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For a web or mobile product, make the client call your own backend. Your server authenticates and authorizes the app user, reads the key from its runtime configuration, and makes the ElevenLabs request. This keeps the provider credential out of code and network responses controlled by the client. If a client-side flow genuinely needs to invoke an endpoint, check whether that endpoint supports a single-use token rather than exposing the long-lived API key.

Choose a key for the environment

Use a service account key for a production backend, and keep separate credentials for production and each non-production environment. ElevenLabs recommends service accounts for backend systems and automation. Workspace admins manage them, and their access is intended for workloads rather than tied to one employee. User keys inherit an individual’s access and are generally better suited to personal development or scripts. See ElevenLabs service accounts and API keys.

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Use only scopes needed for the operations your app performs. Add a credit quota to bound the authorized usage, and, where your deployment has stable public egress addresses, restrict access with an IP allowlist. Requests from addresses outside the allowlist are rejected with 403. Only public IP addresses are accepted for allowlisting; private IP ranges are not valid. An expired user key returns 401. Check the current key settings and behavior in the ElevenLabs API Keys documentation.

Store the secret and load it at runtime

Use your deployment platform’s managed secret facility in production, then inject the value into the Node.js process as an environment variable. The variable name is ordinary configuration; its value is the secret. ElevenLabs’ quickstart recommends managed secret storage and demonstrates an environment variable.

With the official @elevenlabs/elevenlabs-js package, initialize the client on the server like this:

import { ElevenLabsClient } from "@elevenlabs/elevenlabs-js";

const apiKey = process.env.ELEVENLABS_API_KEY;
if (!apiKey) throw new Error("ELEVENLABS_API_KEY is not configured");

const elevenlabs = new ElevenLabsClient({ apiKey });

The SDK uses the key for authenticated requests; the corresponding HTTP authentication header is xi-api-key. A local .env file may be convenient for development, but do not commit a populated file. In production, supply the secret through managed deployment configuration rather than baking it into source code or a frontend build.

• Do not print the key in logs or include it in exception messages.
• Do not return the key in an API response or expose it through client-visible configuration.
• Limit access to the secret to the app process and people or systems that need to deploy it.

Authorize access to voices in your own app

A valid provider key does not decide which of your product’s users may use a particular voice or resource. Enforce that access in your backend: authenticate the app user, check their permission for the requested resource, and only then make the ElevenLabs call. ElevenLabs’ security guidance describes mapping users to voices and permission levels; see ElevenLabs security guidance.

Rotate keys without creating an avoidable outage

Routine rotation

1. Create a replacement key for the same service account with the permissions and restrictions the app needs.
2. Update the deployment’s managed secret and deploy or restart the Node.js process so it reads the replacement.
3. Confirm the application is using the replacement successfully.
4. Delete the old key only after the replacement is active.

If a key may have leaked

1. Disable the exposed key as soon as possible.
2. Issue a replacement with the required permissions and restrictions.
3. Update the managed secret and verify that the application works with the new credential.
4. Investigate where the key escaped, remove it from exposed locations where possible, and review relevant logs and usage.

ElevenLabs says public GitHub secret scanning can automatically disable a publicly committed key when third-party disabling is allowed. Treat that as a possible safety measure, not a recovery plan: it does not establish coverage for private repositories or other leak locations. ElevenLabs also documents a self-disable endpoint that requires api_key_name=self; see API key administration and API authentication.

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