Devs-Fix | Quick Solutions for Real-World Code Errors

Uncaught ReferenceError: process is not defined shows up the moment browser code evaluates the identifier process . It means exactly what it says: there is no global named process in a browser, and Vite — unlike webpack 4 and Create React App — does not invent one for you. The error is almost always one of two things. Either your own code still uses Node-style process.env.SOMETHING , or a third-party dependency was written for Node and ended up in your client bundle untouched. This page gives you the one-line fix first, then 11 distinct causes with runnable reproductions, a diagnostic checklist for the cases that match none of them, and the reason Vite made this a hard error instead of a silent shim. Error Uncaught ReferenceError: process is not defined Where it happens JavaScript in the browser - Vite, Vite + React, SvelteKit, Astro, Rollup, esbuild, or any bundler that does not shim Node globals. Appears at runtime in the browser console, not at build time. What it mean...