DecSoft Support - Issue with writing and reading JSON files

Issue with writing and reading JSON files

DecSoft App Builder include a convenient Command Line Compiler, so you can compile your apps from the console.

Take a look at some frequently asked questions about us and our products!

Save time, resources and money creating apps for Android, iOS and more with the same base of code.

Create apps and expand their capabilities by using the world's popular programming language: Javascript.

DecSoft App Builder integrates an Open AI assistant in order to assist you while developing your apps.

Create multiplatform apps with DecSoft App Builder, including Android and iOS with the same base of code.

DecSoft NeoPlugins put your VisualNeo projects into another level with +1,000 new actions for your apps.

Create modern HTML apps and games at another level making things impossible to do even by modern HTML apps and games.

Apache Cordova's official plugins are supported out of the box and there are hundreds of plugins ready to use.

DecSoft HTML Compiler is easy to use: set your project's options and compile your apps and games in a nutshell.

Compile, convert your modern HTML apps and games into Microsoft Windows executable programs without dependencies.

Take a look at our YouTube channel and subscribe to be notified about new videos!

Design for small screen devices but deploy also (without changes) in larger devices like tablets.

DecSoft NeoPlugins are available in both runtime and designtime flavours to keep your apps as small as possible.

DecSoft HTML Compiler include a convenient Command Line Compiler, so you can compile your apps from the console.

Save money by purchasing our NeoPlugins bundles. Five, Ten and even the complete NeoPlugins collection at an incredible price!

Bryce Beattie

I'm trying to use HTML compiler to save and load .json flavored text files. If I use javascript's JSON.stringify and JSON.parse I can encode and decode data fine. However, when I use stringify to get a string and write it to a file, then read it in to a string and use parse, Javascript throws an "unknown character" error.

For what it is worth, I opened the file written by appReadFile and copy and pasted the stringify results into a json validator, and it says the text is valid json.

If I have javascript write out those two strings (the one i write to the file and the one i read from the file, they strings look the same, but javascript says they are not === or ==.

Is it possible that appReadFile is inserting a hidden character somewhere?

decsoft

Hello Bryce,

Certainly write and read operations don't add nothing to the file to be write or read. Look at the below "index.html" sample, I try it and works as expected after apply the "trim" function, so, probably you need to apply that "trim" function too?

<!DOCTYPE html>
<html lang="en" dir="ltr">
 <head>   
  <meta charset="utf-8">
  <meta name="viewport" 
   content="width=device-width, initial-scale=1">
  <title>HTML Compiler WriteFile Sample</title>
 </head>
 <body>

  <script>
   var
     writeJSON = function() {
       var
         person = {"name": "John", "lastname": "Doe"};
         
       external.appWriteFile('sample.json', JSON.stringify(person));
     };
     
   var
     trim = function (str) {
       return str.replace(/^\s+|\s+$/gm,'');
     };     
     
   var
     readJSON = function() {
       var
         person = JSON.parse(trim(external.appReadFile('sample.json')));
         
       alert(person.name + ' ' + person.lastname);   
     };     

  </script>

  <br>

  <button onclick="javascript:writeJSON();">Write JSON</button>
  
  <br>

  <button onclick="javascript:readJSON();">Read JSON</button>
  
 </body>
</html>

Purchase one or more licenses of our products if they are useful to you!

Bryce Beattie

That did it. I'm not sure why JSON.parse can't deal with an extra whitespace character, but it's now working. Thanks!

decsoft

Hello Bryce,

You're welcome! Certainly, I remember the "space" issue in other environments, languages, etc... I am not completely sure where, but, when you post here the issue, what I first before anything else is to trim the JSON... just because remember that I get the same issue in the past, not related with HTML Compiler!

Purchase one or more licenses of our products if they are useful to you!

Everybody can read the DecSoft support forum for learning purposes, however only DecSoft customers can post new threads. Purchase one or more licenses of some DecSoft products in order to give this and other benefits.