React Native Requires Chilkat v11.0.0+

JSON: Miscellaneous Operations

See more JSON Examples

Demonstrates a variety of JSON API methods. This example uses the following JSON document:

{
   "alphabet": "abcdefghijklmnopqrstuvwxyz",
   "sampleData" : {
           "pi": 3.14,
	   "apple": "juicy",
	   "hungry": true,
	   "withoutValue": null,
           "answer": 42
          
	}
}

React Native

import { JsonObject } from '@chilkat/react-native'

function chilkatExample() {
  const json = new JsonObject();
  json.emitCompact = false;

  // Assume the file contains the data as shown above..
  try {
    json.loadFile('qa_data/json/sample2.json');
  } catch {
    console.log(json.lastErrorText);
    return;
  }

  // Get the "sampleData" object:
  const sampleData = new JsonObject();
  json.objectOf2('sampleData', sampleData);

  // Demonstrate BoolAt and BoolOf
  console.log(`hungry: ${sampleData.boolOf('hungry')}`);
  console.log(`hungry: ${sampleData.boolAt(2)}`);

  // StringOf returns the value as a string regardless of it's actual type:
  console.log(`pi: ${sampleData.stringOf('pi')}`);
  console.log(`answer: ${sampleData.stringOf('answer')}`);
  console.log(`withoutValue: ${sampleData.stringOf('withoutValue')}`);
  console.log(`hungry: ${sampleData.stringOf('hungry')}`);

  // Demonstrate IsNullOf / IsNullAt
  console.log(`withoutValue is null? ${sampleData.isNullOf('withoutValue')}`);
  console.log(`withoutValue is null? ${sampleData.isNullAt(3)}`);
  console.log(`apple is null? ${sampleData.isNullOf('apple')}`);
  console.log(`apple is null? ${sampleData.isNullAt(1)}`);

  // IntOf
  console.log(`answer: ${sampleData.intOf('answer')}`);

  // SetNullAt, SetNullOf
  // Set "pi" to null
  sampleData.setNullAt(0);
  // Set "answer" to null
  sampleData.setNullOf('answer');

  // Show the changes:
  console.log(json.emit());

  // Restore pi and apple:
  sampleData.setNumberAt(0, '3.14');
  sampleData.setNumberOf('answer', '42');

  // Show the changes:
  console.log(json.emit());

  // Add a null value named "afterApple" just after "apple"
  sampleData.addNullAt(2, 'afterApple');

  // Add a boolean value just after "pi"
  sampleData.addBoolAt(1, 'afterPi', false);

  // Examine the changes..
  console.log(json.emit());
}