ARTICLE AD BOX
The issue you are encountering is a common one: you are likely passing the API key as a Query Parameter (in the URL string), but the API you are calling expects it in the HTTP Headers.
When an API documentation says "Header Authentication," it means the key must be sent in the metadata of the request, not visible in the web address itself. In Google Apps Script, the UrlFetchApp.fetch() method handles this through an options object.
The Solution:
You need to create a headers object within your fetch parameters. Note that the "Key Name" (e.g., X-API-KEY or Authorization) depends entirely on that specific API’s requirements.
Here is the corrected, modular code structure:
function callApiWithHeaders() {
const url = "https://api.example.com/data"; // Replace with your actual endpoint
const apiKey = "YOUR_API_KEY_HERE";
// The 'options' object defines the method and the headers
const options = {
"method": "get", // Use "post" if you are sending data "muteHttpExceptions": true, // Helps debug by showing the error message instead of crashing "headers": { "Content-Type": "application/json", "X-API-KEY": apiKey // Verify if your API uses 'X-API-KEY' or 'Authorization' }};
try {
const response = UrlFetchApp.fetch(url, options); const json = JSON.parse(response.getContentText()); Logger.log(json); return json;} catch (e) {
Logger.log("Error: " + e.message);}
}
Why this works:
* Separation of Concerns: By moving the key into the headers object, you follow the security protocol required by the server.
* MuteHttpExceptions: Setting this to true is a best practice during debugging. It prevents the script from stopping if the API returns a 401 (Unauthorized) or 404 error, allowing you to log the actual response body to see exactly what the API is complaining about.
* Content-Type: Many modern APIs require you to explicitly state you are expecting application/json, which is included in the headers above.
One final check: Ensure you have authorized the script to "Connect to an external service" when t
he Google permission pop-up appears!
