Azure Functions NodeJS Express 应用程序抛出无法确定函数入口点错误

Question

I am trying to create a simple hello world azure functions app using nodejs and express. But, i am getting the following error:

Exception while executing function: Functions.httpexpressapp. mscorlib: Unable to determine function entry point. If multiple functions are exported, you must indicate the entry point, either by naming it 'run' or 'index', or by naming it explicitly via the 'entryPoint' metadata property.

Here is my code:

function.json

 {
  "bindings": [
    {
      "authLevel": "anonymous",
      "type": "httpTrigger",
      "direction": "in",
      "name": "req"
    },
    {
      "type": "http",
      "direction": "out",
      "name": "res"
    }
  ],
  "entryPoint": "index",
  "disabled": false
}

index.js:

const express = require('express')
const app = express()

app.get('/', (req, res) => res.send('Express JS Hello World App!!!'))

package.json:

{
  "name": "httpexpressapp",
  "version": "1.0.0",
  "description": "sample app",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "john doe",
  "license": "ISC",
  "dependencies": {
    "express": "^4.16.3"
  }
}

Then, i have a node_modules directory under the function app

Any help is appreciated. Thanks in advance!

Answer 1

The Azure Functions platform is rather opinionated because of its ability to do things like bindings and Triggers. Functions coded in Node in Azure Functions need to be of the form.

module.exports = function(context) {
    // function logic goes here :)
};

You can find some JavaScript tips for Azure Functions here . It looks like you are trying to do a simple HTTP-trigger function . Looking at your example, you would want something like this.

module.exports = function(context, req) {
    context.res = {
        // status defaults to 200 */
        body: "Express JS Hello World App!!!"
    };
    context.done();
};

Note that Azure Functions will be handling the routing of your HTTP requests, so you wouldn't likely want to use Express.js.

Answer 2

Even if you want to use the Express with the Azure function you can go for this Azure AWS serverless Express

package. Its very useful.