Syntax error parsing the JSON file. Nodejs

Question

everybody! I'm trying to build a Google Pagespeed client in nodejs. I get a json file with syntax errors for any url. For example: url: http://www.bbc.com/ , error: enter image description here json file:enter image description here

I need only the property "ruleGroups". I tried to extract it so jsonpath.query(d, '$.ruleGroups') - did not work out. Help please understand, sorry if the issue is dilettian.

    let key = 'key';
    let url = 'http://www.bbc.com/';
    let strategy = 'desktop';

    https.get({
    host: 'www.googleapis.com',
    path:  '/pagespeedonline/v4/runPagespeed?url=' + encodeURIComponent(url) +
    '&key='+key+'&strategy='+strategy
}, function (res) {
    console.log ("statusCode:", res.statusCode);
    console.log ("headers: ", res.headers);
    res.on ('data', function (d) {
        let json = JSON.parse(d);
        fs.appendFile('log.txt', json);
    });
}). on ('error', function (e) {
    console.error (e);
});

Grant Lindsay · Accepted Answer · 2018-02-18 16:07:47Z

1

You may need to accumulate all the data, then parse in the “end” event:

let rawData = '';
res.on('data', (chunk) => { rawData += chunk; });
res.on('end', () => {
  try {
    const parsedData = JSON.parse(rawData);
    console.log(parsedData);
  } catch (e) {
    console.error(e.message);
  }
});

More information: https://nodejs.org/api/http.html#http_http_get_options_callback

answered Feb 18, 2018 at 16:07

Grant Lindsay

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1 Comment

Grant Lindsay Over a year ago

@Blackbonny That's awesome. If my answer was correct, please accept it. It helps you, me, and other readers when they find this question.

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