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var object = { name: 'Harry', age: '25', sex: 'male'...... n};

This object has 'n' number of properties which I don't know and I would like to print these whole properties.

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There are heaps of solutions from a quick Google, a recomended result is; Print content of JavaScript object?

console.log(JSON.stringify(object, null, 4));

The second argument alters the contents of the string before returning it. The third argument specifies how many spaces to use as white space for readability.

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This fails for objects with cycles in their membership.
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You can use the The Object.keys() function to get an array of the properties of the object:

var obj = { name: 'Harry', age: '25', sex: 'male'}; Object.keys(obj).forEach((prop)=> console.log(prop));

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that's too many console.log's; better collect that into a string.

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