JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.19.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.19.1/moment.min.js"></script>

JavaScript

function formatDuration(period) {
    let parts = [];
    const duration = moment.duration(period);
    
    // return nothing when the duration is falsy or not correctly parsed (P0D)
    if(!duration || duration.toISOString() === "P0D") return;
		
    if(duration.years() >= 1) {
      	const years = Math.floor(duration.years());
      	parts.push(years+" "+(years > 1 ? "years" : "year"));
    }
    
    if(duration.months() >= 1) {
    		const months = Math.floor(duration.months());
    		parts.push(months+" "+(months > 1 ? "months" : "month"));
    }
    
    if(duration.days() >= 1) {
    		const days = Math.floor(duration.days());
      	parts.push(days+" "+(days > 1 ? "days" : "day"));
    }
    
    if(duration.hours() >= 1) {
    		const hours = Math.floor(duration.hours());
      	parts.push(hours+" "+(hours > 1 ? "hours" : "hour"));
    }
    
    if(duration.minutes() >= 1) {
      	const minutes = Math.floor(duration.minutes());
      	parts.push(minutes+" "+(minutes > 1 ? "minutes" : "minute"));
		}
    
    if(duration.seconds() >= 1) {
    		const seconds = Math.floor(duration.seconds());
      	parts.push(seconds+" "+(seconds > 1 ? "seconds" : "second"));
    }
    
    return "in "+parts.join(", ");
}   


alert(formatDuration("P2Y12M1DT10M125S"));