Here's a simple JSON formatter tool code in JavaScript:
```
function formatJson(jsonString) {
try {
const jsonObject = JSON.parse(jsonString);
return JSON.stringify(jsonObject, null, 2);
} catch (error) {
return "Invalid JSON";
}
}
// Example usage:
const jsonString = '{"name":"John","age":30,"city":"New York"}';
const formattedJson = formatJson(jsonString);
console.log(formattedJson);
```
This code:
1. Parses the input JSON string into a JavaScript object
2. Stringifies the object with indentation (2 spaces) for formatting
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