Running labstack/echo on Zeit now (Vercel) Serverless function

index.go

// set api/index.go
package handler

import (
	"net/http"

	"github.com/labstack/echo/v4"
	"github.com/labstack/echo/v4/middleware"
)

func hello(c echo.Context) error {
	return c.String(http.StatusOK, "Hello World")
}

func hello2(c echo.Context) error {
	return c.String(http.StatusOK, "Hello World2")
}

func Handler(w http.ResponseWriter, r *http.Request) {
	e := echo.New()
	e.Use(middleware.Logger())
	e.Use(middleware.Recover())
	e.GET("/api/", hello)
	e.GET("/api/2", hello2)

	e.ServeHTTP(w, r)
}

now.json

{
  "name": "hoge",
  "version": 2,
  "routes": [
    { "src": "/api/.*", "dest": "api/index.go" }
  ]
}

Could you show your main file?

Not sure if you still need help with this but essentially handler files don't need main.go handler is the main function.