Do it yourself
#- Open the project. The preview builds as soon as it opens, unless you turned off Run on opening.
- Edit a file. The preview rebuilds when you stop typing, after the Live view delay: 0.1 seconds unless you change it.
- To build it again by hand, choose the Reload button in the preview's toolbar, or press Ctrl+R (Control+R on a Mac).
- To stop the preview, choose the Stop button. To start it again, choose the Start Preview button. Stopping clears the build, so the next start builds everything again.
- To run one file instead of
index.html, point at the file's icon in the file list: the icon turns into a play button. Click it. - In a Python, C, C++, Go or SQL project, choose Run in the console's toolbar, or press Ctrl+R. The output appears in the editor.
To start over from nothing, press Ctrl+Shift+R (Control+Shift+R on a Mac): the build is cleared and runs again.
If it doesn't work
#"No entry point found. Create index.html or click a file to run."
#The preview starts from index.html. Without it, it tries index, main, script, src/main and src/script, with a script ending like .js, .ts, .jsx or .tsx. Create index.html, or choose a file under "Available files to run:".
"Entry point not found: /about"
#The preview's address names a file that does not exist. For /about, the preview tries about, about.html and about/index.html. Choose one of the files the message lists.
"SPA mode is enabled but /index.html not found."
#Create index.html, or turn off SPA mode. See SPA mode.
"Potential infinite loop: exceeded 1500 iterations."
#Loop protection stopped a loop that ran more than 1,500 times. If your loop is meant to run longer, like a game loop or a long list, choose Disable Loop Protection in the console. Loop protection works only in the preview, never on the published site.
"Imported module ... is not installed."
#The preview shows Missing Module. Choose Install followed by the package's name. See Add npm packages.
The preview does not change when you type
#Live reload is off. Choose Reload, or turn it on again: see Turn off automatic runs.
The preview is blank, stuck or frozen
#Press Ctrl+Shift+R, or choose Stop, then Start Preview. For more fixes, see The preview does not load.
Limits
#- The code runs in your browser. Code that needs a server, files on a disk or Node.js runs in a Cloud app instead: see Browser and Cloud projects.
- Loop protection stops
for,whileanddoloops, not a recursion that never ends. - The shortcuts work in the editor only. Help, Keyboard Shortcuts lists the others.