├── .env
├── .gitignore
├── package.json
└── index.js


/.env:
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1 | TOKEN=
2 | MYTOKEN=


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/.gitignore:
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1 | node_modules


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/package.json:
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 1 | {
 2 |   "name": "webhook-in-nodejs",
 3 |   "version": "1.0.0",
 4 |   "description": "webhook in nodejs using express framework - whatsapp cloud api",
 5 |   "main": "index.js",
 6 |   "scripts": {
 7 |     "test": "echo \"Error: no test specified\" && exit 1",
 8 |     "start":"node index.js"
 9 |   },
10 |   "author": "Prasath from PMS",
11 |   "license": "ISC",
12 |   "dependencies": {
13 |     "axios": "^0.27.2",
14 |     "body-parser": "^1.20.0",
15 |     "dotenv": "^16.0.1",
16 |     "express": "^4.18.1"
17 |   }
18 | }
19 | 


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/index.js:
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 1 | const express=require("express");
 2 | const body_parser=require("body-parser");
 3 | const axios=require("axios");
 4 | require('dotenv').config();
 5 | 
 6 | const app=express().use(body_parser.json());
 7 | 
 8 | const token=process.env.TOKEN;
 9 | const mytoken=process.env.MYTOKEN;//prasath_token
10 | 
11 | app.listen(process.env.PORT,()=>{
12 |     console.log("webhook is listening");
13 | });
14 | 
15 | //to verify the callback url from dashboard side - cloud api side
16 | app.get("/webhook",(req,res)=>{
17 |    let mode=req.query["hub.mode"];
18 |    let challange=req.query["hub.challenge"];
19 |    let token=req.query["hub.verify_token"];
20 | 
21 | 
22 |     if(mode && token){
23 | 
24 |         if(mode==="subscribe" && token===mytoken){
25 |             res.status(200).send(challange);
26 |         }else{
27 |             res.status(403);
28 |         }
29 | 
30 |     }
31 | 
32 | });
33 | 
34 | app.post("/webhook",(req,res)=>{ //i want some 
35 | 
36 |     let body_param=req.body;
37 | 
38 |     console.log(JSON.stringify(body_param,null,2));
39 | 
40 |     if(body_param.object){
41 |         console.log("inside body param");
42 |         if(body_param.entry && 
43 |             body_param.entry[0].changes && 
44 |             body_param.entry[0].changes[0].value.messages && 
45 |             body_param.entry[0].changes[0].value.messages[0]  
46 |             ){
47 |                let phon_no_id=body_param.entry[0].changes[0].value.metadata.phone_number_id;
48 |                let from = body_param.entry[0].changes[0].value.messages[0].from; 
49 |                let msg_body = body_param.entry[0].changes[0].value.messages[0].text.body;
50 | 
51 |                console.log("phone number "+phon_no_id);
52 |                console.log("from "+from);
53 |                console.log("boady param "+msg_body);
54 | 
55 |                axios({
56 |                    method:"POST",
57 |                    url:"https://graph.facebook.com/v13.0/"+phon_no_id+"/messages?access_token="+token,
58 |                    data:{
59 |                        messaging_product:"whatsapp",
60 |                        to:from,
61 |                        text:{
62 |                            body:"Hi.. I'm Prasath, your message is "+msg_body
63 |                        }
64 |                    },
65 |                    headers:{
66 |                        "Content-Type":"application/json"
67 |                    }
68 | 
69 |                });
70 | 
71 |                res.sendStatus(200);
72 |             }else{
73 |                 res.sendStatus(404);
74 |             }
75 | 
76 |     }
77 | 
78 | });
79 | 
80 | app.get("/",(req,res)=>{
81 |     res.status(200).send("hello this is webhook setup");
82 | });


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