Converting array object into json in node.js

Question

I am using python shell npm package to invoke the python scripts from node.js. My python Script returns json object which looks like this:

{"timestamp":"2005-10-30 10:45:33","error_code":"0","error_code_string":"Passed","mac_address":"00:0D:6F:41:AA:4A"}

When i run the below code i get the results in the form of array:

const {PythonShell} = require("python-shell")
// import {PythonShell} from 'python-shell';

function Runpy(){

 const options = {
   mode: 'text',
   pythonPath: 'C:/Users/xyz/AppData/Local/Programs/Python/Python38/python3',
   pythonOptions: ['-u'],
   scriptPath: 'D:/ABC',
   args : ['-test=3','-scan=200']
 };

 PythonShell.run('test_runner.py', options, function (err, results) {
   if (err) throw err;
   // results is an array consisting of messages collected during execution
   console.log('results: %j', results);
   //parsed = results.toString();
   //let parsedResult = JSON.parse(results);
   console.log(results);
 });
}

return Runpy();

Output:

results: ["{'timestamp': '2005-10-30 10:45:33', 'error_code': '0', 'error_code_string': 'Passed', 'mac_address': '00:0D:6F:41:AA:4A'}"]

[ '{\'timestamp\': \'2005-10-30 10:45:33\', \'error_code\': \'0\', \'error_code_string\': \'Passed\', \'mac_address\': \'00:0D:6F:41:AA:4A\'}' ]

When I try to parse the variable 'results' i get the error:

SyntaxError: Unexpected token ' in JSON at position 1

I thought since results are already an object I am getting the error. So I tried to stringify the results and parse it. I am not getting any error then, but when I access individual items like timestamps by calling results. timestamp, I am getting as undefined.

Can anyone please suggest a way to convert this into JSON?

JSON requires double quotes. How did they get from your result above to the one below, turning " to '? — ASDFGerte
– ASDFGerte, Commented Oct 31, 2019 at 7:25
@ASDFGerte In the Python Script i am passing the JSON with double quotes, but i think python-shell npm package is replacing the double quotes with single quotes when trying to convert the result into an array. — Harshith R
– Harshith R, Commented Oct 31, 2019 at 7:35

Rain336 · Accepted Answer · 2019-10-31 07:30:07Z

1

The problemcomes from the single ticks '. They need to be double ticks " to be valid json. You can use replace to replace ' with ".

let results = ["{'timestamp': '2005-10-30 10:45:33', 'error_code': '0', 'error_code_string': 'Passed', 'mac_address': '00:0D:6F:41:AA:4A'}"];

results[0] = results[0].replace(/'/g, '"');

let parsed = JSON.parse(results[0])

console.log(parsed)
console.log(parsed.error_code)

answered Oct 31, 2019 at 7:30

Rain336

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3 Comments

Andreas Over a year ago

The only real answer/solution is to fix the output on the server.

ASDFGerte Over a year ago

These types of search-and-destroy replaces should not be used in production code. Imagine `{"a": "mc'cool"}`.

Ali Yousuf Over a year ago

This solution fails if you have single quotes in error_code_string.

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