JSON response ends with newline

[danvirsen]

I'm bumping into something that made me curious.

When returning a JSON response, the body is ended with a newline.
I can't find any APIs that does this for their JSON responses.
Also, going back to older APIs that I have built and/or that are in our organization I can also see that none of them return JSON bodies with a newline at the end.

Does anyone know why echo adds a newline for JSON responses?

A quick example:

This simple route returns with a newline at the end

httpServer.GET("/test", func(ctx echo.Context) error {
  type R struct {
    Id uint `json:"id"`
  }
  u := R{Id: 1}
  return ctx.JSON(200, u)
})

However, if I return a string, no newline is added

httpServer.GET("/test", func(ctx echo.Context) error {
  type R struct {
    Id uint `json:"id"`
  }
  u := R{Id: 1}
  r, _ := json.Marshal(u)
  return ctx.String(200, string(r))
})

[aldas]

This is because of

echo/json.go

Line 19 in deb17d2

return enc.Encode(i)

encoder.Encode method adds newline but function json.Marshal() does not.

• encoder.Encode
• json.Marshal