Unable to resolve the Azure Storage connection named 'Storage' - Azure durable functions - json

Question

My Project
package.json
{
"name": "azure-functions",
"version": "1.0.0",
"description": "",
"scripts": {
"start": "func start",
"test": "echo \"No tests yet...\""
},
"dependencies": {
"durable-functions": "^2.0.2"
}
}
host.json
{
"version": "2.0",
"logging": {
"applicationInsights": {
"samplingSettings": {
"isEnabled": true,
"excludedTypes": "Request"
}
}
},
"extensionBundle": {
"id": "Microsoft.Azure.Functions.ExtensionBundle",
"version": "[3.*, 4.0.0)"
}
}
DurableFunctionsHttpStart/function.json
{
"bindings": [
{
"authLevel": "anonymous",
"name": "req",
"type": "httpTrigger",
"direction": "in",
"route": "orchestrators/{functionName}",
"methods": [
"post",
"get"
]
},
{
"name": "$return",
"type": "http",
"direction": "out"
},
{
"name": "starter",
"type": "orchestrationClient",
"direction": "in"
}
]
}
DurableFunctionsHttpStart/index.js
const df = require("durable-functions");
module.exports = async function (context, req) {
const client = df.getClient(context);
const instanceId = await client.startNew(req.params.functionName, undefined, req.body);
context.log(`Started orchestration with ID = '${instanceId}'.`);
return client.createCheckStatusResponse(context.bindingData.req, instanceId);
};
Hello/function.json
{
"bindings": [
{
"name": "name",
"type": "activityTrigger",
"direction": "in"
}
]
}
Hello/index.js
/*
* This function is not intended to be invoked directly. Instead it will be
* triggered by an orchestrator function.
*
* Before running this sample, please:
* - create a Durable orchestration function
* - create a Durable HTTP starter function
* - run 'npm install durable-functions' from the wwwroot folder of your
* function app in Kudu
*/
module.exports = async function (context) {
return `Hello ${context.bindings.name}!`;
};
HelloOrchestrator/function.json
{
"bindings": [
{
"name": "context",
"type": "orchestrationTrigger",
"direction": "in"
}
]
}
HelloOrchestrator/index.js
/*
* This function is not intended to be invoked directly. Instead it will be
* triggered by an HTTP starter function.
*
* Before running this sample, please:
* - create a Durable activity function (default name is "Hello")
* - create a Durable HTTP starter function
* - run 'npm install durable-functions' from the wwwroot folder of your
* function app in Kudu
*/
const df = require("durable-functions");
module.exports = df.orchestrator(function* (context) {
const outputs = [];
// Replace "Hello" with the name of your Durable Activity Function.
outputs.push(yield context.df.callActivity("Hello", "Tokyo"));
outputs.push(yield context.df.callActivity("Hello", "Seattle"));
outputs.push(yield context.df.callActivity("Hello", "London"));
// returns ["Hello Tokyo!", "Hello Seattle!", "Hello London!"]
return outputs;
});
Upon running npm start on the root of the page, i am getting the following error.
Azure Functions Core Tools
Core Tools Version: 4.0.4736 Commit hash: N/A (64-bit)
Function Runtime Version: 4.8.1.18957
[2022-09-05T11:52:51.483Z] A host error has occurred during startup operation '5dd1dd91-e64a-4866-......'.
[2022-09-05T11:52:51.483Z] Microsoft.Azure.WebJobs.Extensions.DurableTask: Unable to resolve the Azure Storage connection named 'Storage'.
Value cannot be null. (Parameter 'provider')
What could be the reason, i followed this tutorial https://learn.microsoft.com/en-us/azure/azure-functions/durable/quickstart-js-vscode
I didn’t get any prompt to select azure account as mentioned here https://learn.microsoft.com/en-us/azure/azure-functions/durable/quickstart-js-vscode#test-the-function-locally

Answer 1

That exception suggests that the runtime cannot find the value of AzureWebJobsStorage. You should have a local.settings.json file in your project that should look something like this:
{
"IsEncrypted": false,
"Values": {
"AzureWebJobsStorage": "DefaultEndpointsProtocol=https;AccountName=....",
"FUNCTIONS_WORKER_RUNTIME": "node"
}
}
The value of AzureWebJobsStorage should be set to a storage connection string that the Azure function runtime requires.
See: App settings reference for Azure Functions