Writing to JSON files

Ionic Framework ionic-v3
1

Hi, I’m trying to write to JSON files with my app and a promising method seems to be using node. However, to set it up the example I have is:
const fs = require(‘fs’);
fs.writeFile(‘message.txt’, ‘Hello Node.js’, (err) => {
if (err) throw err;
console.log(‘It’s saved!’);
});
I’m pretty sure I could just save it as message.json, but I can’t even declare the fs variable, VS code doesn’t recognise require(), and it gives me an error when I run it in ionic serve. Does anyone know how to use Node.js functions in ionic apps, or is there an easier way to write to JSON files?

2

File writing on mobile devices is restricted. Look at the Cordova File plugin (https://ionicframework.com/docs/v2/native/file/) as a method to do what you need.

1 Like
3

Additionally, browser environments do not have all the necessary infrastructure needed to run things that are expecting to be hosted in Node, so that’s a dead end.

1 Like
4

Thank you, I understand that know and I am trying to use Ionic Native. This is the code I’ve put in my main provider:
saveData(){
let file = {
fields: this.fields,
clients: this.clients,
links: this.links
};
let jFile = JSON.stringify(file);
console.log(file);
console.log(jFile);
File.writeFile(WHATEVER THE PATH IS, ‘sampleData.txt’, jFile, true);
}
What do I insert for the path? I can’t seem to find a value that works.

2 Likes
5

Read up on the actual plugin doc on the Cordova site. Varies from platform to platform. I think Ray Camden’s blog has some good examples

6

File.externalRootDirectory
worked for me and ended in the root of the device (not external SD :wink: )
I didn’t find the files at the deivce when used File.dataDirectory