Discovering a specific value within a JSON stringified array

I am looking for a specific value within a JSON stringify array

[{"id":"432","temperature":"1","humidity":"1","createat":"0000-00-00 00:00:00"},{"id":"433","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:49:57"},{"id":"434","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:52:02"},{"id":"435","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:55:26"},{"id":"436","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:58:50"},{"id":"437","temperature":"22.00","humidity":"48","createat":"2015-10-11 20:02:14"},{"id":"438","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:23:15"},{"id":"439","temperature":"22.50","humidity":"50","createat":"2015-10-11 21:24:37"},{"id":"440","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:17"},{"id":"441","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:41"}]

My approach is to check whether the value I am adding is not already present in the array

javascriptarraysjsonassociative-array

Answer №1

// Transform JSON data into a string
jsonString = '[{"id":"432","temperature":"1","humidity":"1","createat":"0000-00-00 00:00:00"},{"id":"433","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:49:57"},{"id":"434","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:52:02"},{"id":"435","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:55:26"},{"id":"436","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:58:50"},{"id":"437","temperature":"22.00","humidity":"48","createat":"2015-10-11 20:02:14"},{"id":"438","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:23:15"},{"id":"439","temperature":"22.50","humidity":"50","createat":"2015-10-11 21:24:37"},{"id":"440","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:17"},{"id":"441","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:41"}]';

// Convert the stringified JSON to a JavaScript object
parsedData = JSON.parse(jsonString);

// Define the index of the object you wish to verify
index = 0;

// Check if the specified property exists
if (typeof parsedData[index].humidity !== 'undefined') {
  // Assign the property if it exists
  parsedData.humidity = 1;
}

// Convert the object back to a string
jsonString = JSON.stringify(parsedData);

UPDATE: Below is a function named propertyExists:

var propertyExists = function(jsonString, id, property) {
  // Parse the JSON string into a JavaScript object
  parsedData = JSON.parse(jsonString);
  // Check if the property exists for the given ID
  for (var i = 0; i < parsedData.length; i += 1) {
    if (parseInt(parsedData[i].id) === parseInt(id)) {
      return (typeof parsedData[i][property] !== 'undefined');
    }
  }
  return false;
}

// JSON data in string format
var jsonString = '[{"id":"432","temperature":"1","humidity":"1","createat":"0000-00-00 00:00:00"},{"id":"433","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:49:57"},{"id":"434","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:52:02"},{"id":"435","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:55:26"},{"id":"436","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:58:50"},{"id":"437","temperature":"22.00","humidity":"48","createat":"2015-10-11 20:02:14"},{"id":"438","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:23:15"},{"id":"439","temperature":"22.50","humidity":"50","createat":"2015-10-11 21:24:37"},{"id":"440","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:17"},{"id":"441","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:41"}]';

console.log(propertyExists(jsonString, 432, 'humidity'));

Answer №2

....

const dataObj = [{"id":"543","temperature":"2","humidity":"3",.....

let isFound = false;
dataObj.forEach((index,value) => {
    if(dataObj[index].id === newRecord.id){
        isFound = true;
    }
});
if(!isFound){
    dataObj.push(newRecord);
}

....

Answer №3

I am searching for a specific value within a JSON stringify array.

If you want to check if the array contains an object with a certain property that has a specific value, you can use the Array.prototype.some method like this:

function hasPropValue(array, prop, value) {
  return array.some(function(obj) {
    return obj.hasOwnProperty(prop) && obj[prop] === value;
  });
}

some will stop iterating once it finds a match. If your data is in valid JSON format, you can parse it and use the function like this:

hasPropValue(JSON.parse(jsonText), 'id', '432');


var jsonText = '[{"id":"432","temperature":"1","humidity":"1","createat":"0000-00-00 00:00:00"},{"id":"433","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:49:57"},{"id":"434","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:52:02"},{"id":"435","temperature":"22.40","humidity":"48","createat":"2015-10-11 19:55:26"},{"id":"436","temperature":"22.00","humidity":"48","createat":"2015-10-11 19:58:50"},{"id":"437","temperature":"22.00","humidity":"48","createat":"2015-10-11 20:02:14"},{"id":"438","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:23:15"},{"id":"439","temperature":"22.50","humidity":"50","createat":"2015-10-11 21:24:37"},{"id":"440","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:17"},{"id":"441","temperature":"22.50","humidity":"51","createat":"2015-10-11 21:26:41"}]'

function hasPropValue(array, prop, value) {
  return array.some(function(obj) {
    return obj.hasOwnProperty(prop) && obj[prop] === value;
  });
}

document.write(hasPropValue(JSON.parse(jsonText), 'id', '432'));

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