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Dominik
Dominik

Reputation: 87

How do I update the data saved in a JSON file using JavaScript?

How do I update the data saved in a JSON file using JavaScript?

for example: If i have a JSON file called 'person.json', looking like:

{
  "Person": [
    {
      "Firstname": "John",
      "Lastname": "Doe"
    }
  ]
}

and I would like to append as new data set the name 'John Smith'. How could I do this using JavaScript?

EDIT: Now I tried to use 'fs.readFile()' to read my JSON file. The application I develop is a hybrid app using cordova. If i use 'fs.readFile()' i get the error 'Uncaught ReferenceError: fs is not defined'. I tried to fix this problem by adding the line 'var fs = Npm.require('fs');'. But this causes also an error: 'Uncaught ReferenceError: Npm is not defined'

Is this error caused because npm is not available on a smartphone? And how can i fix this problem?

Upvotes: 1

Views: 13867

Answers (1)

Tvde1
Tvde1

Reputation: 1284

You can simply use JSON.parse(data) to parse the JSON string into an object. Then when you're done, use JSON.stringify(object) to convert it into a JSON string.

You can write and read files with fs link.

Upvotes: 3

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