- 1 year ago
How to conditionally add key to json if it doesn't exist?
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To conditionally add a key to a JSON object if it doesn't exist, you can follow these general steps:
- Parse the JSON string into a JavaScript object.
- Check if the key exists in the object.
- If the key doesn't exist, add it with the desired value.
- Convert the JavaScript object back to a JSON string.
Here's an example in JavaScript:
javascript// Example JSON string
const jsonString = '{"name": "John", "age": 30}';
// Parse JSON string into JavaScript object
const jsonObject = JSON.parse(jsonString);
// Check if key exists
if (!jsonObject.hasOwnProperty('address')) {
// Add the key-value pair
jsonObject.address = '123 Main St';
}
// Convert the JavaScript object back to a JSON string
const updatedJsonString = JSON.stringify(jsonObject);
console.log(updatedJsonString);
In this example, if the address
key doesn't exist in the JSON object, it will be added with the value '123 Main St'
. The resulting JSON string will be:
json{"name":"John","age":30,"address":"123 Main St"}
You can adapt this approach to your specific programming language or environment to conditionally add a key to a JSON object if it doesn't exist.