Access nested json objects in node.js

Question

I am trying to access a nested JSON object, but I am getting Cannot read property 'module' of undefined.

Here is the JSON file.

{
  "server": {
    "module": {
      "InPluginPath": "/usr/home/nah/Website/server/httpModule.js"
    }
  }
}

Then when I try to access the JSON object after reading the file with fs.readFile(), I get the Cannot read property 'module' of undefined, error. Below is the line that causes the error.

console.log(config.server.module.InPluginPath);

Please show the specific code you use with fs.readFile(). Do you know that require() will load and parse a .json file for you automatically. — jfriend00
– jfriend00, Commented May 21, 2015 at 1:49

mscdex · Accepted Answer · 2015-05-21 12:33:10Z

1

You need to JSON.parse() the resulting string from fs.readFile(). For example:

fs.readFile('/tmp/foo.json', { encoding: 'utf8' }, function(err, data) {
  if (err) throw err;
  try {
    data = JSON.parse(data);
  } catch (ex) {
    console.log('Error parsing json');
    return;
  }
  console.log(data.server.module.InPluginPath);
});

edited May 21, 2015 at 12:33

answered May 21, 2015 at 1:47

mscdex

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4 Comments

jfriend00 Over a year ago

Or, you could load it as a module with require() and it will get parsed automatically.

mscdex Over a year ago

@jfriend00 Except require() will cache the result, just like modules, and save it in memory. This is not desirable in all cases. Additionally the OP had already mentioned using fs.readFile(), so I thought it was more fitting.

jfriend00 Over a year ago

Its not a criticism, but a suggestion for something you could add to your answer to make it more complete.

jfriend00 Over a year ago

Your console.log() statement isn't using the parsed results. Maybe want to correct that.

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