--- title: How to create a HAR file for Vercel Support description: Learn how to generate a HAR file on macOS and Windows across all major browsers. url: /kb/guide/create-a-har-file-for-vercel-support canonical_url: "https://vercel.com/kb/guide/create-a-har-file-for-vercel-support" published: 2026-03-12 last_updated: 2026-03-12 authors: Justin Vitale related: [] install_vercel_plugin: npx plugins add vercel/vercel-plugin --- ## Related pages > **For AI agents:** Follow these links to understand how this page connects to the rest of the Vercel ecosystem. For the full cross-link map (inbound, outbound, prerequisites, and semantic neighbors), see the .graph.md link below. - [Accessibility Audit Tool](https://vercel.com/docs/vercel-toolbar/accessibility-audit-tool?from=related) — Learn how to use the Accessibility Audit Tool to automatically check the Web Content Accessibility Guidelines 2.0 level - [Tracing](https://vercel.com/docs/tracing?from=related) — Learn how to trace your application to understand performance and infrastructure details. - [Privacy](https://vercel.com/docs/analytics/privacy-policy?from=related) — Learn how Vercel supports privacy and data compliance standards with Vercel Web Analytics. - [Using Web Analytics](https://vercel.com/docs/analytics/using-web-analytics?from=related) — Learn how to use Vercel's Web Analytics to understand how visitors are using your website. - [Getting Started](https://vercel.com/docs/analytics/quickstart?from=related) — Vercel Web Analytics provides you detailed insights into your website's visitors. This quickstart guide will help you ge - [Troubleshooting connectivity issues to Vercel Deployments](https://vercel.com/kb/guide/troubleshooting-connectivity-issues?from=related) — Learn how to troubleshoot network connectivity issues to your Vercel deployment. - [Understanding Cookies](https://vercel.com/kb/guide/understanding-cookies?from=related) — Discover how web cookies function, the importance of cookie attributes for security, and methods for inspecting and debu - [How to Effectively Load Test Your Vercel Application](https://vercel.com/kb/guide/how-to-effectively-load-test-your-vercel-application?from=related) — Learn how to safely load test your Next.js app on Vercel. This guide covers realistic, policy-compliant testing of route - [Add structured application logs to Vercel Functions](https://vercel.com/kb/guide/add-structured-application-logs-to-vercel-functions?from=related) — Learn how to add structured application logs to Vercel Functions to help troubleshoot function issues in real time. - [Monitor Frontend Performance with DebugBear and Vercel](https://vercel.com/kb/guide/monitor-frontend-performance-with-debugbear-and-vercel?from=related) — Automatically test each Vercel deployment and report performance changes to GitHub. Full cross-link map for this page: [/kb/guide/create-a-har-file-for-vercel-support.graph.md](/kb/guide/create-a-har-file-for-vercel-support.graph.md) A HAR (HTTP Archive) file captures a complete record of all network activity between your browser and the server during a session. Vercel Support may request a HAR file from you to investigate an issue and identify a root cause. This guide walks you through generating a HAR file on **macOS** and **Windows** across all major browsers. > **Sensitive data warning**: HAR files can contain cookies, session tokens, authorization headers, and request payloads. Only share HAR files with Vercel Support directly as an attachment to your support case, and avoid sharing them publicly. ## Before getting started - While a HAR file is being recorded, keep the recording running **while you trigger the exact behaviour you're reporting**. Don't stop recording until after the issue occurs. - We recommend recording HAR files in a private/incognito browsing window. This prevents cached data and extensions from interfering with the capture. ## After capturing the HAR file Once you have your `.har` file: 1. **Attach it directly** to your Vercel Support support case. 2. Include a brief description of: - The URL(s) where the issue occurred - The exact steps you took to reproduce it - The timestamp (approximately) when the issue appears in the recording ## For macOS users * * * ### Google Chrome 1\. Open Chrome and navigate to the page where the issue occurs. 2\. Open DevTools using one of these methods: - **Keyboard:** `Cmd + Option + I` - **Right-click** anywhere on the page → **Inspect** 3\. Click the **Network** tab in the DevTools panel. 4\. Check the **Preserve log** checkbox to retain entries across page navigations. 5\. Check **Disable cache** to ensure all requests are captured fresh. 6\. Clear any existing logs by clicking the **🚫** in the top-left of the Network pabel. 7\. Ensure the **record** button (●) in the top-left of the Network panel is active (red). If it's grey, click it to start recording. 8\. **Reproduce the issue** — reload the page or trigger the action that causes the problem. 9\. After reproducing the issue, select the **download** button (downward arrow icon). 10\. Save the file to your Desktop or another convenient location to share with Vercel Support. * * * ### Mozilla Firefox 1\. Open Firefox and navigate to the affected page. 2\. Open DevTools: - **Keyboard:** `Cmd + Option + I` - **Menu:** Tools → Browser Tools → Web Developer Tools 3\. Select the **Network** tab. 4\. Click the **gear icon** (⚙) in the top-right of the Network panel. 5\. Select **Persist Logs** to retain requests across reloads. 6\. Check the **Disable Cache** checkbox at the top-right of the Network panel to ensure all requests are captured fresh. 7\. **Reproduce the issue** — reload the page or trigger the action that causes the problem. 8\. Click the **gear icon** (⚙) in the top-right of the Network panel, or right-click any request. 9\. Select **Save All As HAR**. 10\. Save the file to your Desktop or another convenient location to share with Vercel Support. * * * ### Safari > **Important:** Safari requires you to enable the Develop menu before accessing network tools. **Enable the Develop menu (one-time setup):** 1\. Open **Safari → Settings** (or Preferences on older macOS). 2\. Click the **Advanced** tab. 3\. Check **Show features for web developers** (or "Show Develop menu in menu bar" on older versions). **Capture the HAR file:** 1\. Open the affected page in Safari. 2\. From the menu bar, go to **Develop → Show Web Inspector**, or press `Cmd + Option + I`. 3\. Click the **Network** tab. 4\. Check **Disables Caches** in the top-right of the Network panel to ensure all requests are captured fresh. 5\. **Reproduce the issue** — reload the page or trigger the action that causes the problem. 6\. Click the **Export** button (downward arrow icon) in the top-right corner of the Network panel. 7\. Save the file to your Desktop or another convenient location to share with Vercel Support. ## For Windows users * * * ### Google Chrome 1\. Open Chrome and navigate to the affected page. 2\. Open DevTools: - **Keyboard:** `F12` or `Ctrl + Shift + I` - **Right-click** anywhere on the page → **Inspect** 3\. Click the **Network** tab. 4\. Check **Preserve log** to retain entries across page navigations. 5\. Check **Disable cache** to ensure all requests are captured fresh. 6\. **Reproduce the issue** — reload the page or trigger the action that causes the problem. 7\. After reproducing the issue, select the **download** button (downward arrow icon). 8\. Save the file to your Desktop or another convenient location to share with Vercel Support. * * * ### Mozilla Firefox 1\. Open Firefox and navigate to the affected page. 2\. Open DevTools: - **Keyboard:** `F12` or `Ctrl + Shift + I` - **Menu:** ☰ → More Tools → Web Developer Tools 3\. Select the **Network** tab. 4\. Click the **gear icon** (⚙) in the top-right of the Network panel. 5\. Select **Persist Logs** to retain requests across reloads. 6\. Check the **Disable Cache** checkbox at the top-right of the Network panel to ensure all requests are captured fresh. 7\. **Reproduce the issue** — reload the page or trigger the action that causes the problem. 8\. Click the **gear icon** (⚙) in the top-right of the Network panel, or right-click any request. 9\. Select **Save All As HAR**. 10\. Save the file to your Desktop or another convenient location to share with Vercel Support. * * * ### Microsoft Edge 1\. Open Edge and navigate to the affected page. 2\. Open DevTools: - **Keyboard:** `F12` or `Ctrl + Shift + I` - **Menu:** ··· → More tools → Developer tools 3\. Click the **Network** tab. 4\. Check the **Preserve log** checkbox to retain entries across page navigations. 5\. Check **Disable cache** to ensure all requests are captured fresh. 6\. Clear any existing logs by clicking the **🚫** in the top-left of the Network panel. 7\. Ensure the **record** button (●) in the top-left of the Network panel is active (red). If it's grey, click it to start recording. 8\. **Reproduce the issue** — reload the page or trigger the action that causes the problem. 9\. After reproducing the issue, select the **download** button (downward arrow icon). 10\. Save the file to your Desktop or another convenient location to share with Vercel Support.