index.tmpl

          const comment = document.querySelector('#comment')
            const all = document.querySelector('#all_comments')
            const url = `${ api_dns }`
            function send_comment(){
                fetch(`${ api_dns }`+'/comment',{
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json'
                    },
                    mode: 'cors',
                    body: JSON.stringify({comment: comment.value})
                }).then(res=>{
                        return res.json()
                    })
                    .then(data=>{
                        console.log(data)
                    })
            }
            function get_all(){
                all.innerText = ''
                fetch(`${ api_dns }`+'/all_comments',{
                    method: 'GET',
                    headers: {
                        'Content-Type': 'application/json'
                    },
                    mode: 'cors',
                }).then(res=>{
                        return res.json()
                    })
                    .then(data=>{
                        data.map(el=>{
                            let e = document.createElement('p')
                            all.append(el.comment, e)
                        })
                    })
            }
            setInterval(()=>{get_all()},1000)