I have this json file:
test.json:
{"rows" : [
{"key": "value"},
{"key": "value"}
]
}
I tried this code to read it:
var json = require('test.json');
for (var row in json.rows) {
console.log(row.key);
}
it prints:
/usr/local/bin/node json-parser.js
undefined
undefined
What am I doing wrong?
Where row is the variable holding property name not the object, so you need to retrieve it using the property name ( Refer : for...in loop documentation). In your case it will be the index of array. There is no need to use for...in iterator here, a simple for loop is enough.
for (var row in json.rows) {
console.log(json.rows[row].key);
}
var json = {
"rows": [{
"key": "value"
}, {
"key": "value"
}]
};
for (var row in json.rows) {
console.log(json.rows[row].key);
}With a simple for loop
for (var i=0;i < json.rows.length; i++) {
console.log(json.rows[i].key);
}
var json = {
"rows": [{
"key": "value"
}, {
"key": "value"
}]
};
for (var i = 0; i < json.rows.length; i++) {
console.log(json.rows[i].key);
}Since the property holds an array useArray#forEach method to iterate.
json.rows.forEach(function(v){
console.log(v.key);
}
var json = {
"rows": [{
"key": "value"
}, {
"key": "value"
}]
};
json.rows.forEach(function(v) {
console.log(v.key);
})
json variable has a property named row? shoun't the json var which I read have property named rows and each var row has a property named key? (according to json structure test.json)
for loop iterates the properties I don't get why each json variable should even have a property named row! shouldn't json var read represent the json.test it has no property named rowfor prints nothing and the second way (Object.keys) does yield value and then value