How to read/write JSON data between files? (Node.Js)
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I am working on a project which requires writing data to a JSON file from one module and calling it from another. However this does not happen, it returns undefined:1 SyntaxError: Unexpected end of JSON input.
I need to use synchronous functions for this.
Here is a sample file which shows my issue.
Index.js
const fs = require('fs');
const {idk} = require('./idk.js');
fs.writeFileSync('output.json', '', 'utf8'); //Clears the file
idk();// calls the module
var result = fs.readFileSync('output.json', 'utf8'); //reads the file
console.log(JSON.parse(result));//outputs a parsed file
Sample.js
const fs = require('fs');
module.exports.sample = function(){
var a = fs.readFileSync('output.json', 'utf8');//reads the file
var b = JSON.parse(a);// parses json data
console.log(b);// expected output {"instances": }
b.instances.push('yo'); //pushes to array
var c = JSON.stringify(b);// stringify
fs.writeFileSync('output.json', c, 'utf8'); //supposed to write '{"instances": ['yo']}'
}
javascript node.js json fs
asked Jan 4 at 2:31
Arkin SolomonArkin Solomon
788
add a comment |
0
I am working on a project which requires writing data to a JSON file from one module and calling it from another. However this does not happen, it returns undefined:1 SyntaxError: Unexpected end of JSON input.
I need to use synchronous functions for this.
Here is a sample file which shows my issue.
Index.js
const fs = require('fs');
const {idk} = require('./idk.js');
fs.writeFileSync('output.json', '', 'utf8'); //Clears the file
idk();// calls the module
var result = fs.readFileSync('output.json', 'utf8'); //reads the file
console.log(JSON.parse(result));//outputs a parsed file
Sample.js
const fs = require('fs');
module.exports.sample = function(){
var a = fs.readFileSync('output.json', 'utf8');//reads the file
var b = JSON.parse(a);// parses json data
console.log(b);// expected output {"instances": }
b.instances.push('yo'); //pushes to array
var c = JSON.stringify(b);// stringify
fs.writeFileSync('output.json', c, 'utf8'); //supposed to write '{"instances": ['yo']}'
}
javascript node.js json fs
asked Jan 4 at 2:31
Arkin SolomonArkin Solomon
788
3
Please provide the JSON written tooutput.json. This error is typically indicative of invalid JSON.
– Ben Beck
Jan 4 at 2:32
There probably isn't anything wrong with your code. As your error saysUnexpected end of JSON input, this is saying that your initial json fileoutput.jsonis not valid JSON. Either post the file as @BenBeck suggested or look it over for the error that is within the file.
– Get Off My Lawn
Jan 4 at 3:10
2
@GetOffMyLawn and @BenBeck, now I realize my mistake, I was clearing the JSON file to be empty instead of writing{"instances": }. Thank you for resolving my issue.
– Arkin Solomon
Jan 4 at 3:42
add a comment |
0
0
0
I am working on a project which requires writing data to a JSON file from one module and calling it from another. However this does not happen, it returns undefined:1 SyntaxError: Unexpected end of JSON input.
I need to use synchronous functions for this.
Here is a sample file which shows my issue.
Index.js
const fs = require('fs');
const {idk} = require('./idk.js');
fs.writeFileSync('output.json', '', 'utf8'); //Clears the file
idk();// calls the module
var result = fs.readFileSync('output.json', 'utf8'); //reads the file
console.log(JSON.parse(result));//outputs a parsed file
Sample.js
const fs = require('fs');
module.exports.sample = function(){
var a = fs.readFileSync('output.json', 'utf8');//reads the file
var b = JSON.parse(a);// parses json data
console.log(b);// expected output {"instances": }
b.instances.push('yo'); //pushes to array
var c = JSON.stringify(b);// stringify
fs.writeFileSync('output.json', c, 'utf8'); //supposed to write '{"instances": ['yo']}'
}
javascript node.js json fs
asked Jan 4 at 2:31
Arkin SolomonArkin Solomon
788
I am working on a project which requires writing data to a JSON file from one module and calling it from another. However this does not happen, it returns undefined:1 SyntaxError: Unexpected end of JSON input.
I need to use synchronous functions for this.
Here is a sample file which shows my issue.
Index.js
const fs = require('fs');
const {idk} = require('./idk.js');
fs.writeFileSync('output.json', '', 'utf8'); //Clears the file
idk();// calls the module
var result = fs.readFileSync('output.json', 'utf8'); //reads the file
console.log(JSON.parse(result));//outputs a parsed file
Sample.js
const fs = require('fs');
module.exports.sample = function(){
var a = fs.readFileSync('output.json', 'utf8');//reads the file
var b = JSON.parse(a);// parses json data
console.log(b);// expected output {"instances": }
b.instances.push('yo'); //pushes to array
var c = JSON.stringify(b);// stringify
fs.writeFileSync('output.json', c, 'utf8'); //supposed to write '{"instances": ['yo']}'
}
javascript node.js json fs
javascript node.js json fs
asked Jan 4 at 2:31
Arkin SolomonArkin Solomon
788
asked Jan 4 at 2:31
Arkin SolomonArkin Solomon
788
asked Jan 4 at 2:31
Arkin SolomonArkin Solomon
788
asked Jan 4 at 2:31
Arkin SolomonArkin Solomon
788
asked Jan 4 at 2:31
Arkin SolomonArkin Solomon
788
788
3
Please provide the JSON written tooutput.json. This error is typically indicative of invalid JSON.
– Ben Beck
Jan 4 at 2:32
There probably isn't anything wrong with your code. As your error saysUnexpected end of JSON input, this is saying that your initial json fileoutput.jsonis not valid JSON. Either post the file as @BenBeck suggested or look it over for the error that is within the file.
– Get Off My Lawn
Jan 4 at 3:10
2
@GetOffMyLawn and @BenBeck, now I realize my mistake, I was clearing the JSON file to be empty instead of writing{"instances": }. Thank you for resolving my issue.
– Arkin Solomon
Jan 4 at 3:42
add a comment |
3
Please provide the JSON written tooutput.json. This error is typically indicative of invalid JSON.
– Ben Beck
Jan 4 at 2:32
There probably isn't anything wrong with your code. As your error saysUnexpected end of JSON input, this is saying that your initial json fileoutput.jsonis not valid JSON. Either post the file as @BenBeck suggested or look it over for the error that is within the file.
– Get Off My Lawn
Jan 4 at 3:10
2
@GetOffMyLawn and @BenBeck, now I realize my mistake, I was clearing the JSON file to be empty instead of writing{"instances": }. Thank you for resolving my issue.
– Arkin Solomon
Jan 4 at 3:42
3
3
Please provide the JSON written to
output.json. This error is typically indicative of invalid JSON.– Ben Beck
Jan 4 at 2:32
Please provide the JSON written to
output.json. This error is typically indicative of invalid JSON.– Ben Beck
Jan 4 at 2:32
There probably isn't anything wrong with your code. As your error says
Unexpected end of JSON input, this is saying that your initial json file output.json is not valid JSON. Either post the file as @BenBeck suggested or look it over for the error that is within the file.– Get Off My Lawn
Jan 4 at 3:10
There probably isn't anything wrong with your code. As your error says
Unexpected end of JSON input, this is saying that your initial json file output.json is not valid JSON. Either post the file as @BenBeck suggested or look it over for the error that is within the file.– Get Off My Lawn
Jan 4 at 3:10
2
2
@GetOffMyLawn and @BenBeck, now I realize my mistake, I was clearing the JSON file to be empty instead of writing
{"instances": }. Thank you for resolving my issue.– Arkin Solomon
Jan 4 at 3:42
@GetOffMyLawn and @BenBeck, now I realize my mistake, I was clearing the JSON file to be empty instead of writing
{"instances": }. Thank you for resolving my issue.– Arkin Solomon
Jan 4 at 3:42
add a comment |
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3
Please provide the JSON written to
output.json. This error is typically indicative of invalid JSON.– Ben Beck
Jan 4 at 2:32
There probably isn't anything wrong with your code. As your error says
Unexpected end of JSON input, this is saying that your initial json fileoutput.jsonis not valid JSON. Either post the file as @BenBeck suggested or look it over for the error that is within the file.– Get Off My Lawn
Jan 4 at 3:10
2
@GetOffMyLawn and @BenBeck, now I realize my mistake, I was clearing the JSON file to be empty instead of writing
{"instances": }. Thank you for resolving my issue.– Arkin Solomon
Jan 4 at 3:42