I created a JSON file as follows
{
"fooditems" : [
{
"name": "pizza",
"type": "fastfood",
"price": 10
},
{
"name": "apple",
"type": "fruit",
"price": 1
}
]
}
created a JS file to read the JSON file
const data = require("./data.json");
data1 = JSON.parse(data);
data1.foodData.forEach( foodItem => console.log(foodItem));
When I run the JS, I get error for the json file
Syntax error: Unexpected token o in json at position 1
at JSON.parse
You don't need to parse data since it's already and object. The following should work.
const data = require("./data.json");
data.fooditems.forEach( foodItem => console.log(foodItem));
Note foodData was change to fooditems based on the contents of the data.json file.
Your initial data JSON contains "fooditems", but in the JS file you are trying to process the "foodData". Change the "foodData" to "fooditems" and it should work.
I think that you are trying to access invalid object key in your JS file on the last line.
Instead of
data1.foodData
put
data1.fooditems
Related
I have a JSON file that I am using javascript to read, I am able to print it out in console, but I have to manually code the number of objects in the JSON file, the file is really simple with only 3 objects, I would like to create a function that checks how many objects are in JSON file.
Json Code
{
"items": [
{
"fname": "Kali",
"lname": "Flower",
"age": "19"},
{
"fname": "JD",
"lname": "Wyatt",
"age": "19"
}]
}
I'm trying to write a javascript function showing how many objects are in it
Use JSON.parse to convert the content to object then use .length to get the size:
JSON.parse(fs.readFileSync(file)).items.length
Explained:
const fs = require("fs"); // require fs
const content = fs.readFileSync(file); // read the file content as string
const obj = JSON.parse(content); // convert string to object
const length = obj.items.length;
I'm trying to dynamically build a vuetify component in a nuxt project (Using different text values with vuetify component) by importing and iterating through json in a module (https://hackernoon.com/import-json-into-typescript-8d465beded79).
My json in /static/info.json is:
{
"id": 1,
"name": "Johnson, Smith, and Jones Co.",
"amount": 345.33,
"Remark": "Pays on time"
}
In my vue component I have:
import * as data from '../static/info.json';
const word = data.name;
console.log(word); // output 'testing'
console.log(data); // output 'testing'
var jsonData = JSON.parse(data);
// console.log(jsonData); // output 'testing'
The line:
var jsonData = JSON.parse(data);
causes:
Cannot convert object to primitive value
How can I iterate through the imported json?
I would guess data is already an object and doesn't need to be parsed again. The import has turned it into an object. You've already used it with data.name
I have a CSV file and I want to parse it using PapaParse. How do I do this properly?
I have so far:
Papa.parse(fileInput, {
download: true,
complete: function(results) {
console.log(results.data);
console.log(results.errors);
}
});
However, is there a better way to do this? Is this the proper way to get errors? The documentation didn't emphasize download: true or anything so I was wondering if there are any experts on this subject here.
EDIT: Also, am I suppose to further parse the file with papacsv or do it in react. For instance, if I have multiple arrays in my data file which have a similar name reference. Should I initially somehow parse the file so it groups all those references together and how would I go about doing this?
For instance,
Date, Name , Win/Lose
I want to group all the winners together. How do I do that?
The method you are using of Papa parse, is for remote CSV.
download: true is for downloading the remote file.
By using Papa parse, this is the only way of getting errors, data, meta with parse result object.
//If(header:true)
var data = [
{
"date": "8/12/2018",
"name": "foo",
"win/loose": "win"
},
{
"date": "8/12/2018",
"name": "foo",
"win/loose": "loose"
},
{
"date": "8/12/2018",
"name": "foo1",
"win/loose": "win"
},
];
var winners = data.filter(d => d['win/loose'] == 'win');
console.log(winners);
//If you want to group winners and losers then:
var grouped = data.reduce(function(acc, co) {
var key = co['win/loose'];
if(!acc[key]) {
acc[key] = [];
}
acc[key].push(co);
return acc;
}, {});
console.log(grouped);
This'll give you separate array of winners from extracted data.
I am writing to a json file in casperjs and am trying to add new objects to it.
json file looks like
{ "visited": [
{
"id": "258b5ee8-9538-4480-8109-58afe741dc2f",
"url": "https://................"
},
{
"id": "5304de97-a970-48f2-9d3b-a750bad5416c",
"url": "https://.............."
},
{
"id": "0fc7a072-7e94-46d6-b38c-9c7aedbdaded",
"url": "https://................."
}]}
The code to add to the array is
var data;
if (fs.isFile(FILENAME)) {
data = fs.read(FILENAME);
} else {
data = JSON.stringify({ 'visited': [] });
}
var json = JSON.parse(data);
json.visited.push(visiteddata);
data = JSON.stringify(json, null, '\n');
fs.write(FILENAME, data, "a");
This is starting off by adding an new { "visited" : [ ] } array with first couple of objects, below the existing { "visited" : [ ] } array and subsequently the script breaks because the json array is no longer valid json.
Can anybody point me in the right direction. Thank you in advance.
You have a JSON file containing some data.
You:
Read that data
Modify that data
Append the modified version of that data to the original file
This means the file now has the original data and then, immediately after it, a near identical copy with a little bit added.
You don't need the original. You only need the new version.
You need to write to the file instead of appending to it.
Change the 'a' flag to 'w'.
I am using the node.js to interpret a JSON data, the data format is like this below
{
"href": "https://localhost/light/0000293D",
"i-object-metadata": [
{
"rel": "temperature",
"val": "244"
}
]
}
I can print the raw data using print (body)
to interpret data all works except printing the field i-object-metadata
var obj = JSON.parse(body);
console.log(obj.items); // works well
console.log(obj.i-object-metadata); // error
How could I interpret the JSON object like this i-object-metadata
Can't use the object shorthand in this case, you'll have to use the array notation:
console.log(obj['i-object-metadata'].val); // 244