Keep your Telegram bot token in a server-only environment variable, such as TELEGRAM_BOT_TOKEN, and make Bot API requests only from server-side code. Never use a NEXT_PUBLIC_ variable for it: Next.js bundles those values into browser JavaScript. For incoming webhooks, also configure Telegram’s webhook secret and validate its request header in a Next.js Route Handler.
Why a Telegram bot token needs special care
Telegram’s Bot API uses HTTPS request URLs in this form: https://api.telegram.org/bot<token>/METHOD_NAME. The token is part of the URL path, so a complete request URL can expose the credential if it appears in browser output, logs, traces, error reports, or screenshots. Keep requests and their URLs on the server, and redact the token wherever request details may be recorded. Telegram Bot API
Store the token as a private Next.js environment variable
Use a clear name such as TELEGRAM_BOT_TOKEN, without the NEXT_PUBLIC_ prefix. Next.js loads .env* values into process.env, where server-side code can access private values. By contrast, values prefixed with NEXT_PUBLIC_ are inlined into browser JavaScript during next build; they are not secrets. Next.js environment variables guide Next.js self-hosting guide
Local development
- Add
TELEGRAM_BOT_TOKENto a local environment file, such as.env.local, and read it only in server-side code throughprocess.env.TELEGRAM_BOT_TOKEN. - Keep real credentials out of version control. The default
create-next-apptemplate places environment files in.gitignore; confirm your project does too. Next.js documentation cautions: “You almost never want to commit these files to your repository.” Next.js environment variables guide
Production deployment
Set the variable in your deployment platform’s private environment-variable or secrets settings, then make it available to the server-side code that calls Telegram. Configuration labels and procedures vary by provider, so follow that provider’s current instructions. Do not expose the value through a client component, API response, or public runtime configuration.
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Make Telegram API calls on the server
Read the token in a server-only function and construct the Telegram request there. Return the result your interface needs to the browser—not the Bot API URL or token. Avoid placing the full URL in application logs, telemetry, exception messages, or debugging screenshots; the token-in-path format makes those records potential disclosure points. Telegram Bot API
- Do not name the variable
NEXT_PUBLIC_TELEGRAM_BOT_TOKEN. - Do not import or reference the token in client-facing code.
- Do not send a complete token-bearing request URL to the browser.
- Keep request logging and error reporting from recording the token-bearing URL.
Validate Telegram webhook requests in a Route Handler
Telegram supports an optional secret_token for webhook setup and sends its value in the X-Telegram-Bot-Api-Secret-Token header. Store the configured webhook secret separately as a server-side environment variable. In the Route Handler that receives the webhook, compare the incoming header to that secret before processing the body or triggering bot actions. Telegram documents the header, and Next.js documents Route Handlers as a way to receive third-party webhooks, including an example that returns HTTP 401 when a secret does not match. Telegram Bot API Next.js Backend for Frontend guide
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Webhook-secret validation protects this webhook endpoint from requests that lack the expected shared secret. It does not authenticate unrelated application routes, so secure those routes according to their own access requirements.
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What to do if the token leaks
- Treat a disclosed token as compromised, whether it appeared in source control, a browser bundle, a log, a trace, or an error report.
- Replace it through the applicable Telegram bot controls. Telegram’s Bot API reference documents replacement for managed bots, but that does not establish that ordinary BotFather-managed bots use an identical workflow. Check Telegram’s current instructions for your bot type rather than relying on unverified click-by-click steps. Telegram Bot API Telegram Bot Features
- Update the private environment variable in every deployment that uses the bot, then redeploy or restart as required by your hosting platform.
- Review where the old token was exposed and remove or restrict accessible copies where possible. Check logs, telemetry, repository history, and error-reporting records that may contain the complete request URL.
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