javascript - Trying to save scraped data to an object with nightmarejs, gives me error -

i want save data json file first want save title,release date, rating , review moviedata object gives me error: moviedata not defined.

var nightmare = require('nightmare'); var fs = require('fs');  var nightmare = nightmare({ show: true }); var moviedata = {};  nightmare   .goto('http://www.imdb.com/')   .type('#navbar-query', 'ghostbusters')   .click('#navbar-submit-button')   .wait('#main')   .click('.findsection table .findresult a')   .wait('#wrapper')   .evaluate(function () {     moviedata.title = document.queryselector('.title_wrapper h1').innertext;     moviedata.releasedate = document.queryselector('.subtext a[title*="dates" i]').innertext;     moviedata.rating = document.queryselector('span[itemprop="ratingvalue"]').innertext;     return moviedata;   })   .then(function (data) {     console.log('data = ' + json.stringify(data));     return nightmare       .click('.user-comments .see-more a:nth-child(3)')       .wait()       .select('select[name="filter"]', 'chrono')       .wait('#wrapper')       .evaluate(function () {         moviedata.review = document.queryselector('#tn15content p').innertext;         return moviedata;       })       .end()       .then(function (data) {         console.log('review = ' + data.review);       })   })   .catch(function (error) {     console.error('search failed:', error);   }); 

your issue 1 of scope. moviedata in second evaluate statement not work becuase in different scope compared original moviedata object literal in first evaluate function. pass scope, need make changes below.

nightmare   .goto('http://www.imdb.com/')   .type('#navbar-query', 'ghostbusters')   .click('#navbar-submit-button')   .wait('#main')   .click('.findsection table .findresult a')   .wait('#wrapper')   // .evaluate(data1())   .evaluate(function () {     var moviedata = {}     moviedata.title = document.queryselector('.title_wrapper h1').innertext;     moviedata.releasedate = document.queryselector('.subtext a[title*="dates" i]').innertext;     moviedata.rating = document.queryselector('span[itemprop="ratingvalue"]').innertext;     return moviedata;   })   .then(function (data) {     console.log('data = ' + json.stringify(data));     return nightmare       .click('.user-comments .see-more a:nth-child(3)')       .wait()       .select('select[name="filter"]', 'chrono')       .wait('#wrapper')       .evaluate(function (b) {            b.review = document.queryselector('#tn15content p').innertext;         return b;       }, data)       .end()       .then(function (data) {         console.log('review = ' + data.review);         console.log(data);       })   })   .catch(function (error) {     console.error('search failed:', error);   }); 

this works because passing object moviedata first then() function second then() , passing third scope .evaluate() through b.