How can I display a JavaScript object?

  1. Home
  2. javascript
  3. How can I display a JavaScript object?

How do I display the content of a JavaScript object in a string format like when we alert a variable?

The same formatted way I want to display an object.

First answer

If you want to print the object for debugging purposes, use the code:

var obj = {prop1: 'prop1Value', prop2: 'prop2Value', child: {childProp1: 'childProp1Value'}}
console.log(obj)

will display:

screenshot console chrome

Note: you must only log the object. For example, this won’t work:

console.log('My object : ' + obj)

Note ‘: You can also use a comma in the log method, then the first line of the output will be the string and after that the object will be renderd:

console.log('My object: ', obj);

Second answer

Use native JSON.stringify method.
Works with nested objects and all major browsers support this method.

str = JSON.stringify(obj);
str = JSON.stringify(obj, null, 4); // (Optional) beautiful indented output.
console.log(str); // Logs output to dev tools console.
alert(str); // Displays output using window.alert()

Link to Mozilla API Reference and other examples.

obj = JSON.parse(str); // Reverses above operation (Just in case if needed.)

Use a custom JSON.stringify replacer if you
encounter this Javascript error

"Uncaught TypeError: Converting circular structure to JSON"

Third answer

var output = '';
for (var property in object) {
  output += property + ': ' + object[property]+'; ';
}
alert(output);
Reprint:https://stackoverflow.com/questions/957537/how-can-i-display-a-javascript-object
Spread the love

Related articles

Comments are closed.