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writeJson() function in fs-extra - NodeJS
writeJson() writes an object to a JSON file by parsing.
Syntax
writeJson(file, object[, options] [, callback])
Parameters
file – String parameter which will contain name and location of the JSON file.
object – Object passed into the writeJson function.
options – The 'outputFile' function supports the following options −
spaces – The number of spaces will be passed in this parameter for indentation.
EOL – Setting the 'end of line' character, Default is '
'.replacer – It takes two parameters – key and value. Will replace If key found, the value will be replaced by the given value.
callback – This function will give a callback if any error occurs.
Example 1
Check that fs-extra is installed before proceeding; if not, install fs-exra.
You can use the following command to check whether fs-extra is installed or not.
npm ls fs-extra
Create a writeJsonAsyncExample.js and copy-paste the following code snippet into that file.
Now, run the following command to run the following code snippet.
node writeJsonAsyncExample.js
Code Snippet −
const fs = require('fs-extra')
// Writing JSON with a callback:
fs.writeJson('./package.json', {name: 'fs-extra'}, err => {
if (err) return console.error(err)
console.log('JSON written successfully with callbacks!')
})
// Writing JSON with Promises:
fs.writeJson('./package.json', {name: 'fs-extra'})
.then(() => {
console.log('JSON written successfully with Promises!')
})
.catch(err => {
console.error(err)
})
// Writing JSON with async/await:
async function writeJsonAsyncExample () {
try {
await fs.writeJson('./package.json', {name: 'fs-extra'})
console.log('JSON written successfully with Await!')
} catch (err) {
console.error(err)
}
}
writeJsonAsyncExample()Output
C:\Users\tutorialsPoint\> node writeJsonAsyncExample.js JSON written successfully with Promises! JSON written successfully with Await! JSON written successfully with callbacks!
Introduction to writeJsonSync()
This method writes objects to a JSON file.
Syntax
writeJsonSync(file, object[, options])
Parameters
file – String parameter which will contain name and location of the JSON file.
object – Object passed into the writeJson function.
options – The 'outputFile' function supports the following options −
spaces – The number of spaces will be passed in this parameter for indentation.
EOL – Setting the 'end of line' character, Default is '
'.replacer – It takes two parameters – key and value. Will replace If key found, the value will be replaced by the given value.
Example
Check that fs-extra is installed before proceeding; if not, install fs-exra.
You can use the following command to check whether fs-extra is installed or not.
npm ls fs-extra
Create a writeJsonSyncExample.js and copy-paste the following code snippet into that file.
Now, run the following command to run the following code snippet.
node writeJsonSyncExample.js
Code Snippet −
const fs = require('fs-extra')
fs.writeJsonSync('./package.json', {name: 'fs-extra'})
console.log('Successfully written to JSON !')Output
C:\Users\tutorialsPoint\> node writeJsonSyncExample.js Successfully written to JSON !
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