Common reasons and solutions for automatic formatting failure in VSCode when saving are as follows: 1. Make sure format on save is enabled, you can check in the settings or add "editor.formatOnSave" in settings.json: true; 2. Check whether formatting tools such as Prettier and ESLint are installed and correctly configured, and set as the default formatter; 3. Install the corresponding plug-in for specific file types such as .vue or .jsx and configure rules; 4. Troubleshoot plug-in conflicts or overridden settings, try to uninstall unnecessary plug-ins and manually trigger the formatting test effect.
Automatic formatting during saving fails in VSCode, usually not because there is a problem with the function itself, but because there is a configuration or environment error. If you find that "format on save" does not take effect, the following common reasons and corresponding solutions can help you troubleshoot.

1. Check whether format on save is enabled
First, make sure you have enabled this function. VSCode is turned off by default.
- Open Settings (can be via
Ctrl ,
or the menu bar File > Preferences > Settings) - Search
format on save
- Make sure Format On Save is checked
Or, add in settings.json
file:

"editor.formatOnSave": true
Some users mistakenly think that the plug-in will take effect automatically, but in fact, this option needs to be enabled manually.
2. Is there a suitable formatting tool?
VSCode itself does not format the code directly, it depends on the formatting tools you install (such as Prettier, ESLint, Black, etc.). If these tools are not installed or configured correctly, even if format on save is enabled, it will not work.

Check steps:
- Confirm that you have installed formatting plugins (such as Prettier - Code formatter)
- Is there a configuration file in the project root directory (such as
.prettierrc
or.eslintrc
) - Make sure that the plugin is set as the default formatting tool
You can enter "Format Document With..." in the command panel ( Ctrl Shift P
) to view the formatter currently used and set it to default.
3. Language or file type is not supported
Sometimes you will find that certain file types (such as .vue
or .jsx
) cannot be formatted automatically, which may be because the formatter currently used does not support such files, or requires additional configuration.
For example:
- For Vue files, you need to install the
Vetur
plugin and enable its formatting function - For JSX/TSX files, make sure that the relevant rules for ESLint or Prettier are configured
In addition, the formatting behavior of a specific language can be specified in the following ways:
"[javascript]": { "editor.defaultFormatter": "esbenp.prettier-vscode" }, "[typescript]": { "editor.defaultFormatter": "esbenp.prettier-vscode" }
4. Conflict with other plugins or are disabled
Sometimes you may have multiple formatting plugins installed at the same time, causing conflicts; it is also possible that some extensions disable the save-time formatting behavior.
You can try:
- Uninstall unnecessary formatting plugins
- Search
format
in settings to see if it is overwritten by other plugins - Use the shortcut key
Shift Alt F
to manually trigger the formatting to see if it works properly
If manual formatting is effective and save is invalid, it is likely that it is a configuration problem rather than a plug-in not installed properly.
Basically these common problem points. Sometimes it's not that VSCode doesn't work, but that we missed a small configuration item. Check it step by step in the order above, and it can be done in most cases.
The above is the detailed content of VSCode format on save not working. For more information, please follow other related articles on the PHP Chinese website!

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