# Development & Debugging {% hint style="success" %} The easiest way to debug your xApps is by using our xApp Developer App for desktop (Mac, Windows, Linux): [xAppBuilder 🏗️](/environments/xapps-dapps/xappbuilder.md) {% endhint %} Some things that may help debugging your xApp: ## Remote JS Console Using [https://remotejs.com](https://remotejs.com/) you can drop one line (script) in your page's `` and get realtime access to the remote console (bi-directional). ## Replay OTT's If you open your own xApp using the device you added in the Xumm Developer Console as debug device (using the Device Identifier), the OTT (one time token) can be replayed when visiting from the same IP address. {% hint style="info" %} Note: Replaying OTT's only works if you force your browser to identify with the user agent **xumm/xapp**. In the Chrome Developer Console, on the **Network** tab, click the "Radio antenna signal" icon and uncheck "Use browser default" next to **User agent.** {% endhint %} * Make sure your device (Xumm - Settings - Advanced) is whitelisted as Debug Identifier in the Xumm Developer Console * Make sure your phone and computer are visiting from the same public IP address (e.g. by having them both on the same WiFi and internet connection * Obtain your OTT in the xApp: it's the value of the `xAppToken` query parameter. Your xApp is being called with `https://your-url/?xAppToken=...` * Now open your public xApp URL with `/force` appended, and include the xApp Token. E.g. if your xApp launch URL is:\ `https://xumm.app/detect/xapp:sandbox.abcd1234`\ ... You open (in your browser):\ `https://xumm.app/detect/xapp:sandbox.abcd1234/force?xAppToken=...` You will now see your xApp in your browser. ## Use your local dev URL as xApp URL Use a tool like `ngrok` ([https://ngrok.io](https://ngrok.io/)) or `localtunnel.me` ([https://localtunnel.me](https://localtunnel.me/)) to temporarily publish your local development URL to a publicly available URL you can use to access your xApp during live debug/development. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.xaman.dev/environments/xapps-dapps/debugging.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.