netlify.function.js

exports.handler = function(event, context, callback) {
    // your server-side functionality
    callback(null,{
        statusCode: 200,
        body: `hi , my name is Safi @saphidev`
    })
}
//or async function
exports.handler = async function(event, context) {
    // your server-side functionality
    
    try{
        let result = await someAmazingPromise()
        return {
            statusCode: 200,
            body: `hi , my twitter is @saphidev`
        }
        
    }catch(err){
        return {
            statusCode: 400,
            body: `there is an error,no problem ;)  my twitter is @saphidev`
        }
    }
}