I've been attempting to extract information from my JSON data, but I keep getting an undefined result.
Here is a snippet of my JSON:
{
"1": "A",
"2": "B",
"3": "C",
"4": "D",
"5": "E",
"6": "F",
"key":"pair"
}
This is how I'm parsing the data:
rawdata = fs.readFileSync('data.json');
data = JSON.parse(rawdata);
console.log(data.1) //returns undefined. I even tried converting 1 to a String with no luck.
console.log(data.key) //outputs pair
If a property of an object starts with a number, you cannot access it using dot notation.
To retrieve the value of such a property, you must use square bracket notation instead:
let obj = JSON.parse(`{
"1": "A",
"2": "B",
"3": "C",
"4": "D",
"5": "E",
"6": "F",
"key":"pair"
}`);
console.log(obj['1']);When using dot notation to access a value, it is important that the property key is a valid identifier
To clarify, the property in this code needs to be a valid JavaScript identifier, which consists of alphanumerical characters, underscores ("_"), and dollar signs ("$"), and cannot begin with a number. For example, object.$1 is acceptable, but object.1 is not.
If needed, bracket notation can also be used like so:
obj['1']
You can find more information in the Property Accessors section of the spec
If you want to access the content of a JSON file in your code, you can use the following line:
const data = fs.readFileSync('./data.json');data.json file is located in the same directory as your script.
After reading the file, you can retrieve specific values using .data['1'].
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