JSFiddle - React, Tailwind, and code Playground

HTML

<div id="tel_agence"></div>
<div id="fax_agence"></div>

JavaScript

var monJSON= {"Paris": {"tel":"tel paris",
               "fax":"fax Paris",
               "mail": "mail Paris",
               "adr":"Adr PAris",
                "hor":" Horaires Paris....."},    
"Lille": {"tel":"tel Lille",
               "fax":"fax Lille",
               "mail": "mail Lille",
               "adr":"Adr Lille",
                "hor":" Horaires Lille"},     
"Douai": {"tel":"tel Douai",
               "fax":"fax Douais",
               "mail": "mail Douais",
               "adr":"Adr Douais",
                "hor":" Horiares Douais"}
             }

document.getElementById('tel_agence').innerHTML=monJSON.Paris.tel;
document.getElementById('fax_agence').innerHTML=monJSON.Paris.fax;