javascript - How do I access this property of an object from a RESTful API? -


i'm writing community today i'm having confusion while trying access object provided api.

api used:

concept:

i'll receive object identical myobject when accessing api make sure understand object i've included source code can access below.

the object pretty formating

{   "result": [{     "id": "e9a821b6379bd22539226a4cc6956144",     "mode": "challenge",     "allowed_modes": ["block", "challenge", "whitelist", "js_challenge"],     "status": "active",     "notes": "by api",     "scope": {       "id": "981969ce21909a61b62905c585ec9aaa",       "email": "user@example.com",       "type": "user"     },     "configuration": {       "value": "ad",       "target": "country"     },     "created_on": "2017-08-06t17:05:19.126546z",     "modified_on": "2017-08-06t17:05:19.126546z"   }],   "result_info": {     "page": 1,     "per_page": 1,     "total_pages": 251,     "count": 1,     "total_count": 251   },   "success": true,   "errors": [],   "messages": [] }

the code below returns number 251 without issue what's expected.

var myobject = {"result":[{"id":"e9a821b6379bd22539226a4cc6956144","mode":"challenge","allowed_modes":["block","challenge","whitelist","js_challenge"],"status":"active","notes":"by api","scope":{"id":"981969ce21909a61b62905c585ec9aaa","email":"user@example.com","type":"user"},"configuration":{"value":"ad","target":"country"},"created_on":"2017-08-06t17:05:19.126546z","modified_on":"2017-08-06t17:05:19.126546z"}],"result_info":{"page":1,"per_page":1,"total_pages":251,"count":1,"total_count":251},"success":true,"errors":[],"messages":[]}  console.log(myobject["result_info"]["total_pages"])

in real use:

this script ran in node, configure module contains api keys , stuff (they shouldn't exposed obvious reasons).

// import required modules var request = require('request'); var config = require('./config');   // setup account details , site details (to edit these variables edit config.js) var accountemail = config.accountemail; var globalapikey = config.globalapikey;   // setup other needed variables var userfirewallruleids = []; // store ids of each firewall rule in array var currentpage = 1; var pagecount = 0;  // page count (doing first request twice less efficient - refactor in future)   // configure headers (pretend curl now) var headers = {   'user-agent': 'curl/7.47.0',   'content-type': 'application/json',   'x-auth-email': accountemail,   'x-auth-key': globalapikey, }  // configure request var options = {   url: 'https://api.cloudflare.com/client/v4/user/firewall/access_rules/rules?mode=challenge&configuration_target=country&page=1&per_page=1&order=mode&direction=desc&match=all',   method: 'get',   headers: headers }  // request (in production can remove console.log lines or comment out - default it'll return entire response or bad can see went or wrong) request(options, function(error, response, body) {   if (!error && response.statuscode == 200) {     console.log(body["result_info"]["total_pages"]);   } else {     console.log(body);   } })

however unlike concept code running console.log(body["result_info"]["total_pages"]); return error.

/documents/coding/cloudflare-scripts/remove-user-level-firewall-rules.js:44  console.log(body["result_info"]["total_pages"]);   ^  typeerror: cannot read property 'total_pages' of undefined  @ request._callback (/users/nathanielsuchy/documents/coding/cloudflare-scripts/remove-user-level-firewall-rules.js:44:36)  @ request.self.callback (/users/nathanielsuchy/node_modules/request/request.js:188:22)  @ emittwo (events.js:125:13)  @ request.emit (events.js:213:7)  @ request.<anonymous> (/users/nathanielsuchy/node_modules/request/request.js:1171:10)  @ emitone (events.js:115:13)  @ request.emit (events.js:210:7)  @ incomingmessage.<anonymous> (/users/nathanielsuchy/node_modules/request/request.js:1091:12)  @ object.oncewrapper (events.js:314:30)  @ emitnone (events.js:110:20)

how should go fixing script can access page count directly api's object output?

after digging issue further , other answers , comments able find solution.

while example code json parse bit off , still caused error, after doing bit more research on json parse, found solution, , writing following code gave me requested information.

console.log(json.parse(body)["result_info"]["total_pages"]);

the main thing property bracket notations needed outside json parse function.

thank provided here , helping me come solution.


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