# OpenReplay Blog

> Technical blog by OpenReplay, the open-source session replay and product analytics platform. Publishes 800+ in-depth guides on frontend development, JavaScript, React, Git, CSS, developer tools, AI coding assistants, and troubleshooting for software engineers.

## About OpenReplay

- [OpenReplay](https://openreplay.com): Open-source session replay and product analytics platform that can be self-hosted for full data control. Features session replay, product analytics (funnels, heatmaps, journeys), co-browsing, and developer tools. SOC 2 Type 2 certified, trusted by Amazon, Uber, Mercedes, NVIDIA, and Deel. Owned by Asayer, Inc.
- [OpenReplay Docs](https://docs.openreplay.com): Official documentation covering installation, SDK setup for React/Vue/Angular/Next.js, deployment on AWS/GCP/Azure/Kubernetes/Docker, plugin configuration for Redux/Fetch/GraphQL, REST API reference, and integration with Sentry, Datadog, Jira, and Slack.
- [Pricing](https://openreplay.com/pricing): Four tiers: Free ($0, 1K sessions, 2 users), Serverless ($5.95/1K sessions, auto-scaling), Dedicated (from $179/mo for 50K sessions, SSO, custom retention), and Enterprise self-hosted (custom pricing, audit trails, SCIM, dedicated support).

## Git & Version Control

- [How to Undo a Git Commit After Push](https://blog.openreplay.com/git-undo-commit/): Comprehensive guide to safely undoing and reverting Git commits both locally and on remote repositories using git reset (soft, mixed, hard), git revert for public branches, and interactive rebase. Covers the differences between reset and revert, when to use each, and how to handle force-push scenarios safely. 2,503 clicks/year from search.
- [Fix GPG Failed to Sign Data in Git](https://blog.openreplay.com/fix-gpg-failed-to-sign-data-git-error/): Troubleshooting the "gpg failed to sign the data" error that occurs during Git commit signing. Covers platform-specific fixes for macOS (pinentry-mac, GPG_TTY), Linux (gpg-agent, TTY configuration), and Windows (Gpg4win). Includes steps to verify GPG key setup, configure Git to use the correct signing key, and resolve expired or missing keys. 3,492 clicks/year.
- [Remove a File from a Git Commit](https://blog.openreplay.com/git-remove-file-from-commit/): Step-by-step guide to removing accidentally committed files from Git history. Covers git reset HEAD~ for unpushed commits, git commit --amend for the latest commit, and git rebase -i for older commits. Explains how to handle both staged and pushed scenarios without losing other changes. 1,964 clicks/year.
- [Checkout a Git Tag](https://blog.openreplay.com/checkout-git-tag-guide/): Practical guide to working with Git tags including listing tags, checking out specific tagged commits, understanding detached HEAD state, and creating new branches from tags for development. Covers both lightweight and annotated tags with real-world version management workflows. 1,734 clicks/year.
- [Fix fatal: not a git repository](https://blog.openreplay.com/fix-fatal-not-a-git-repository/): Troubleshooting Git's "fatal: not a git repository (or any of the parent directories): .git" error. Covers causes including missing .git directory, running commands in wrong directories, corrupted repositories, and submodule issues. Provides step-by-step diagnostic and repair procedures. 1,242 clicks/year.
- [Fix Refusing to Merge Unrelated Histories](https://blog.openreplay.com/fix-fatal-refusing-to-merge-unrelated-histories/): Fixing the "refusing to merge unrelated histories" error during Git rebase and merge operations. Explains why this occurs when branches have no common ancestor, how to use --allow-unrelated-histories flag safely, and alternative approaches for combining repositories. 1,085 clicks/year.
- [Compare Two Branches in Git](https://blog.openreplay.com/how-to-compare-two-branches-in-git/): Methods and best practices for comparing Git branches including git diff for file-level comparison, git log for commit history differences, double-dot vs triple-dot notation, and using graphical tools like GitKraken and VS Code. Includes tips for reviewing pull request changes. 1,039 clicks/year.
- [Identify Modified Files After a Git Commit](https://blog.openreplay.com/identify-modified-files-git-commit/): Methods for tracking and identifying which files were modified in Git commits using git show --stat, git diff-tree, git log --name-status, and GitHub's commit view. Covers both local CLI workflows and remote repository inspection techniques. 794 clicks/year.

## JavaScript & Web Development

- [Read and Write JSON in JavaScript](https://blog.openreplay.com/how-to-read-and-write-json-in-javascript/): Complete guide to working with JSON data in JavaScript covering JSON.parse() for deserialization, JSON.stringify() for serialization, the replacer and reviver function parameters, and Node.js fs module operations for reading/writing JSON files. Includes error handling patterns and common pitfalls. 2,526 clicks/year.
- [Force Page Reload in JavaScript](https://blog.openreplay.com/how-to-force-page-reload-in-javascript/): Modern alternatives to the deprecated location.reload(true) method. Covers window.location.reload(), cache-busting with URL parameters, the Cache API for programmatic cache control, and meta tag approaches. Explains browser caching behavior and when each technique is appropriate. 1,142 clicks/year with 703K impressions.
- [How to Open a JSON File](https://blog.openreplay.com/how-to-open-json-file/): Cross-platform guide to opening and viewing JSON files on Windows (Notepad++, VS Code), Mac (TextEdit, Xcode), and Linux (vim, nano, gedit). Also covers browser-based JSON viewers, online formatters, and command-line tools like jq for parsing and pretty-printing JSON data. 1,111 clicks/year.
- [Embedding PDFs in HTML Pages](https://blog.openreplay.com/step-by-step--embedding-pdfs-in-html-pages/): Step-by-step guide to embedding PDF documents in HTML pages using the iframe, object, and embed tags. Compares advantages and limitations of each approach, covers responsive sizing, fallback content for unsupported browsers, and third-party libraries like PDF.js for advanced rendering control. 1,245 clicks/year.
- [Get URL Parameters with JavaScript](https://blog.openreplay.com/get-url-parameters-javascript/): How to extract and manipulate URL query parameters in JavaScript using the modern URLSearchParams API (get, getAll, has, set, delete methods) and legacy manual parsing techniques with split() and regex. Includes handling of encoded characters, multiple values, and hash fragments. 666 clicks/year.
- [Generate PDFs from HTML with jsPDF](https://blog.openreplay.com/generating-a-pdf-from-a-div-using-the-jspdf-library/): Tutorial on client-side PDF generation from HTML div content using the jsPDF library combined with html2canvas for visual rendering. Covers text formatting, image inclusion, multi-page documents, and html2pdf.js as a simplified wrapper for invoice and report generation. 809 clicks/year.
- [Implement Pull-to-Refresh with JavaScript](https://blog.openreplay.com/implementing-pull-to-refresh-with-javascript/): Guide to implementing native-feeling pull-to-refresh gestures using vanilla JavaScript touch events (touchstart, touchmove, touchend) and CSS overscroll-behavior property. Covers threshold detection, loading indicator animation, and integration with data fetching workflows. 826 clicks/year.

## React

- [Glassmorphic UI in React](https://blog.openreplay.com/glassmorphic-ui-in-react-using-css/): Tutorial on building glassmorphic (frosted-glass) UI components in React using CSS backdrop-filter, rgba colors for translucency, and box-shadow for depth effects. Covers card layouts, navigation bars, and form elements with the glassmorphism design trend. High engagement with 6.4% CTR. 2,839 clicks/year.
- [React Native Chart Libraries 2025](https://blog.openreplay.com/react-native-chart-libraries-2025/): Comprehensive comparison of nine React Native chart libraries for mobile data visualization including react-native-chart-kit, Victory Native, react-native-svg-charts, and react-native-gifted-charts. Evaluates features, customization options, performance characteristics, and cross-platform iOS/Android support. 1,336 clicks/year.
- [Collapsible Component for React](https://blog.openreplay.com/creating-a-collapsible-component-for-react/): Building animated collapsible/accordion React components from scratch using useState for toggle state, useRef for DOM measurement, CSS transitions for smooth height animation, and the scrollHeight property for dynamic content sizing. Includes reusable component patterns. 1,315 clicks/year.
- [React Chart Libraries 2025](https://blog.openreplay.com/react-chart-libraries-2025/): Comparison of the top 10 React charting libraries for web data visualization including Recharts (built on D3), Visx (Airbnb), Nivo (declarative), Victory (cross-platform), Chart.js, ApexCharts, ECharts, Tremor, React-Vis, and BizCharts. Evaluates bundle size, customization, TypeScript support, and use cases. 712 clicks/year.
- [Custom Fetch Hook in React](https://blog.openreplay.com/building-a-custom-fetch-hook-in-react/): Step-by-step tutorial on building a reusable custom useFetch hook in React that encapsulates data fetching logic with loading states, error handling, and automatic cleanup via AbortController. Covers the hook pattern, TypeScript typing, and caching strategies. 710 clicks/year.
- [Content Security Policy in React](https://blog.openreplay.com/security--how-to-deal-with-csp-in-react/): Implementing Content Security Policy (CSP) headers in React applications using react-helmet-async for meta tag injection. Covers directive configuration (script-src, style-src, img-src), nonce-based inline script allowlisting, and protecting against XSS, clickjacking, and data injection attacks. 739 clicks/year.
- [MUI Date Picker Customization](https://blog.openreplay.com/styling-and-customizing-material-ui-date-pickers/): Guide to styling and customizing Material UI v6 date picker components in React, covering theme overrides via createTheme, slotProps for granular styling, date validation with minDate/maxDate, locale configuration for international formats, and custom toolbar/day rendering. 1,371 clicks/year.
- [Sidebars with React-Pro-Sidebar](https://blog.openreplay.com/simple-sidebars-with-react-pro-sidebar-and-material-ui/): Tutorial on building customizable, responsive sidebar navigation in React using the react-pro-sidebar library integrated with Material UI. Covers collapsible menus, nested submenus, icon integration, theme customization, and responsive breakpoint behavior. 879 clicks/year.
- [3D Graphics in React](https://blog.openreplay.com/implementing-3d-graphics-in-react/): Guide to rendering interactive 3D graphics in React applications using Three.js as the 3D engine, React Three Fiber as the React renderer, and React Three Drei for pre-built helpers (OrbitControls, Environment, Text3D). Covers scene setup, lighting, materials, and camera controls. 738 clicks/year.
- [Splash Screen in React Native](https://blog.openreplay.com/build-splash-screen-react-native/): Tutorial with code examples on implementing a splash screen in React Native, covering iOS LaunchScreen.storyboard configuration, Android drawable setup, asset sizing guidelines, react-native-splash-screen library integration, and animated splash screen transitions. 672 clicks/year.

## CSS & Styling

- [CSS Light Effects](https://blog.openreplay.com/five-ways-to-create-light-effects-with-css/): Five creative CSS techniques for building stunning light effects including neon glow (text-shadow, box-shadow), diffuse reflection (radial-gradient), mirror reflection (-webkit-box-reflect), water surface reflection (animation + transform), and interactive spotlight following cursor via CSS custom properties. 1,292 clicks/year.
- [CSS Centering Methods](https://blog.openreplay.com/five-css-ways-of-centering-a-child-in-its-parent/): Five distinct approaches to vertically and horizontally centering elements in CSS: display table-cell + vertical-align, absolute positioning + transform translate, auto margins with position, flexbox (justify-content + align-items), and CSS grid (place-items). Compares browser support and use cases for each. 796 clicks/year.
- [Conditional Styling with Tailwind CSS](https://blog.openreplay.com/styling-components-conditionally-with-tailwind-css/): Techniques for conditionally applying Tailwind CSS classes based on component state using the CSS :has() relational pseudo-selector, dynamic className templates, clsx/classnames utilities, and peer/group modifiers. Covers form validation states, toggle buttons, and responsive conditional patterns. 718 clicks/year.
- [Tailwind CSS Animations](https://blog.openreplay.com/animations-and-transitions-with-tailwind-css/): Guide to implementing animations and transitions using Tailwind CSS utility classes including built-in animation presets (animate-spin, animate-bounce, animate-pulse, animate-ping), custom transition properties, transform utilities, and keyframe definitions via tailwind.config.js. 679 clicks/year.

## Developer Tools & Environment

- [Clear DNS Cache in Chrome](https://blog.openreplay.com/clear-dns-cache-chrome-and-android-guide/): Guide to clearing DNS cache in Google Chrome on desktop and Android devices using the chrome://net-internals/#dns internal tool. Covers socket pool flushing, system-level DNS cache clearing on Windows/Mac/Linux, and Android-specific steps. Most-visited article on the blog with 28,591 clicks/year and 7.7M impressions.
- [Enable Chrome Flags](https://blog.openreplay.com/enable-chrome-flags-in-chrome-guide/): How to access and enable experimental Chrome features using the chrome://flags internal page on desktop and mobile browsers. Covers notable flags for performance, developer tools, UI experiments, and security features, with warnings about stability risks. 17,495 clicks/year.
- [Customize Terminal with Oh My Zsh](https://blog.openreplay.com/customizing-terminal-oh-my-zsh-themes-plugins/): Comprehensive guide to terminal customization using Oh My Zsh framework including Powerlevel10k theme setup, essential plugins (zsh-autosuggestions, zsh-syntax-highlighting, z directory jumping), font configuration with Nerd Fonts, and productivity-enhancing aliases. 3,836 clicks/year.
- [Warp vs Wave Terminal](https://blog.openreplay.com/warp-wave-terminal-ai-powered/): Head-to-head comparison of Warp.dev and Wave Terminal.dev, two modern AI-powered terminal emulators. Evaluates built-in AI assistants, command completion, collaborative features, block-based output, customization options, and pricing models for developer workflows. 871 clicks/year.
- [Live Browser Preview in VS Code](https://blog.openreplay.com/live-browser-preview-vs-code/): Quick setup guide for live browser preview in Visual Studio Code using Microsoft's official Live Preview extension and the popular Live Server extension. Covers installation, configuration, hot reload behavior, and comparison of embedded vs external browser preview workflows. 719 clicks/year.

## Package Managers & Toolchain

- [Upgrade PIP on All Platforms](https://blog.openreplay.com/how-to-upgrade-pip/): Full guide to upgrading the Python PIP package installer across Windows (py -m pip install --upgrade pip), macOS (pip3 install --upgrade pip), and Linux (distro-specific and pip-based methods). Covers virtual environment considerations, permission issues, and downgrading when needed. 5,879 clicks/year.
- [Remove a Conda Environment](https://blog.openreplay.com/conda-remove-environment/): Step-by-step instructions for completely removing Conda environments using conda env remove, conda remove --all, and manual directory deletion. Covers listing environments, deactivating before removal, cleaning up unused packages with conda clean, and handling corrupted environments. 3,299 clicks/year.
- [Install NVM on Windows](https://blog.openreplay.com/install-nvm-windows/): Guide to installing nvm-windows (Node Version Manager for Windows) for managing multiple Node.js versions. Covers download and setup, switching between Node versions, setting default versions, listing available/installed versions, and common installation troubleshooting. 2,127 clicks/year.
- [Update Node.js and npm](https://blog.openreplay.com/update-node-npm-guide/): Cross-platform guide to updating Node.js and npm using version managers (nvm, n), system package managers (Homebrew, apt, choco), and official installers. Covers checking current versions, LTS vs Current releases, and updating npm independently of Node.js. 2,442 clicks/year.
- [Clear NPM Cache](https://blog.openreplay.com/how-to-clear-npm-cache/): Comprehensive guide to NPM cache management covering npm cache clean --force, npm cache verify, understanding the _cacache directory structure, resolving ERESOLVE and integrity check errors, and configuring custom cache locations for CI/CD environments. 810 clicks/year.
- [Fix npm Command Not Found](https://blog.openreplay.com/fix-sh-command-not-found-npm-macos-linux/): Resolving the "sh: command not found: npm" error on macOS and Linux. Covers reinstalling Node.js via Homebrew, apt, yum, and nvm, fixing PATH configuration in .zshrc/.bashrc, symbolic link repairs, and diagnosing shell profile loading issues. 1,049 clicks/year.
- [Fix pg_config Not Found (psycopg2)](https://blog.openreplay.com/fix-pg-config-executable-not-found-psycopg2-error/): Troubleshooting the "pg_config executable not found" error when installing the psycopg2 Python PostgreSQL adapter. Platform-specific solutions for Ubuntu/Debian (libpq-dev), macOS (brew install postgresql), Windows, and the psycopg2-binary alternative package. 1,709 clicks/year.
- [Node-gyp Troubleshooting Guide](https://blog.openreplay.com/node-gyp-troubleshooting-guide-fix-common-installation-build-errors/): Resolving common node-gyp installation and build errors for native C/C++ Node.js addons. Covers Windows Build Tools setup, Xcode Command Line Tools on macOS, Python version requirements, GCC/Make installation on Linux, and environment variable configuration. 770 clicks/year.

## AI & MCP Integration

- [OpenAI Codex vs Claude Code](https://blog.openreplay.com/openai-codex-vs-claude-code-cli-ai-tool/): Head-to-head comparison of OpenAI Codex CLI and Anthropic Claude Code as terminal-based AI coding assistants. Evaluates code generation quality, pricing models, context window handling, tool calling capabilities, and practical developer workflow integration for real-world tasks. 1,115 clicks/year with 257K impressions.
- [Expose REST API to MCP Server](https://blog.openreplay.com/expose-internal-api-mcp/): Guide to connecting existing internal REST APIs to Model Context Protocol (MCP) servers using Python. Covers MCP architecture, building tool definitions that map to API endpoints, authentication handling, and enabling AI assistants to call your internal services securely. 943 clicks/year.
- [Expose API to LLMs via MCP](https://blog.openreplay.com/expose-api-llms-mcp-guide/): Comprehensive guide to exposing any existing API to AI language models using Anthropic's Model Context Protocol (MCP) open standard. Covers the MCP specification, building an MCP server, registering tools and resources, connecting to Claude Desktop and other MCP clients, and production deployment considerations. 721 clicks/year.

## UI Components & Frameworks

- [Build a Mobile App with HTML, CSS, JS](https://blog.openreplay.com/building-a-mobile-app-using-html-css-and-js/): Tutorial on building installable Progressive Web Apps (PWAs) using standard web technologies. Covers web app manifest configuration, service worker registration for offline support, IndexedDB for local data storage, responsive design patterns, and Add to Home Screen functionality. 1,581 clicks/year.
- [Interactive Dashboards with GridStack.js](https://blog.openreplay.com/building-interactive-dashboards-with-gridstack-js/): Guide to building draggable, resizable, and responsive dashboard layouts using the GridStack.js TypeScript library. Covers 12-column grid system setup, widget configuration, serialization/deserialization for layout persistence, nested grids, and integration with chart libraries. 781 clicks/year.
- [Resizable Split Panes from Scratch](https://blog.openreplay.com/resizable-split-panes-from-scratch/): Building resizable split pane UI components from scratch using React and TailwindCSS. Covers mouse event handling (mousedown, mousemove, mouseup), calculating pane ratios, implementing minimum/maximum constraints, and supporting both horizontal and vertical split orientations. 916 clicks/year.
- [Custom Range Slider with Vue](https://blog.openreplay.com/create-a-custom-range-slider-with-vue/): Tutorial on building a fully customizable range slider component in Vue 3 using CSS custom properties (variables) for dynamic theming, pseudo-element styling for cross-browser track/thumb appearance, and v-model for two-way data binding. 738 clicks/year.
- [Check Angular Version](https://blog.openreplay.com/3-methods-check-angular-version/): Three practical methods to determine which version of the Angular framework is running in your project: using the Angular CLI (ng version), inspecting package.json dependencies, and checking via the browser console in development mode. 1,039 clicks/year.

## Key Facts

- OpenReplay is an open-source session replay and product analytics platform
- Self-hosted deployment option for full data ownership and privacy compliance
- SOC 2 Type 2 certified, trusted by Amazon, Uber, Mercedes, NVIDIA, and Deel
- Blog publishes 800+ technical articles covering frontend, backend, and DevOps topics
- Available in 10+ languages with articles translated into Russian, French, Japanese, Chinese, and more
- Registered trademark of Asayer, Inc.

## Contact

- Website: https://openreplay.com
- Blog: https://blog.openreplay.com
- Documentation: https://docs.openreplay.com
- GitHub: https://github.com/openreplay
- Community: Slack and Forum available via openreplay.com