Timer based trigger - Testing locally - azure

Question

Trying to test CRON trigger function app locally but getting an error:
"The listener for function 'Functions.timer' was unable to start. Microsoft.Azure.WebJobs.Script: Could not create BlobServiceClient to obtain the BlobContainerClient using Connection: Storage."
local.settings.json
{
"IsEncrypted": false,
"Values": {
"AzureWebJobsStorage": "",
"FUNCTIONS_WORKER_RUNTIME": "node",
"ConnectionStrings:BlobStorageAccount": "UseDevelopmentStorage=true"
}
}
function.json
{
"bindings": [
{
"schedule": "*/1 * * * *",
"name": "reportScheduler",
"type": "timerTrigger",
"direction": "in"
}
],
"disabled": false
}
and index.js
const timer = async function(context, req) {
context.log("=======PROCESSED=======");
context.res = {
// status: 200, /* Defaults to 200 */
body: "HELLO WORLD",
};
};
module.exports = timer;
Really struggling with the documentation specifically around these error messages and translating those into the required changes in local.settings.json
other information:
npm i -g azure-functions-core-tools#3 --unsafe-perm true
func start

Answer 1

To run the azure functions (whatever the trigger type), need the azure functions core tools to be installed in your system.
That you can install using npm command or executable file installation available in this documentation.
Note: To install the azure function core tools using npm command is: npm i -g azure-functions-core-tools#3 --unsafe-perm true and you have to run this command in integrated terminal of Visual Studio Code.
For Windows, integrated terminal of VS Code is PowerShell, here you can find the integrated terminal:
To Create and run the Timer Triggered Function, please refer this documentation for step by step procedure.
I have created the timer trigger JavaScript Azure Function and started to run the function using command func start, running successfully:
I set the CRON expression to every minute for running the function so it is showing the function runs at every minute in the above output console.
local.settings.json code:
{
"IsEncrypted": false,
"Values": {
"AzureWebJobsStorage": "UseDevelopmentStorage=true",
"FUNCTIONS_WORKER_RUNTIME": "node"
}
}
And
In your index.js:
const timer = async function(context, req
The req object refers to http request class so the req and res objects should be defined in function.json class like:
This documentation refers to Azure JavaScript Function Http Trigger.