November 6, 2023
The first step in troubleshooting this issue is to inspect the
script tag where the Google Maps API is included. Ensure that the
src attribute of the script tag includes the
callback parameter with a valid function name that will be called once the API is loaded.
YOUR_API_KEY with your actual API key and
initMap with the name of the callback function you intend to use.
Ensure that the callback function specified in the script tag's
Confirm the order of script execution
Your callback function must be defined before the Google Maps script attempts to call it. If the script is loaded asynchronously, it's crucial to have the callback function available, or else you'll encounter the error.
Check for async and defer attributes
defer attributes in the script tag ensure that the loading of the API does not block the rendering of the page. The use of
async implies that the script will be executed as soon as it is loaded, while
defer will execute the script after the document has been parsed. Either attribute necessitates the use of a callback.
Verify no multiple API loads
Use error handling
Include error handling within your callback function to catch any issues that arise during the initialization of the map.
Update the API key permissions
Testing in isolation
If the issue persists, isolate the API loading script in a simple HTML file to rule out conflicts with other scripts or libraries.
YOUR_API_KEY with your actual API key and include your map initialization code in
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