Context

echo.Context represents the context of the current HTTP request. A pointer to it (*echo.Context) is passed to every handler and middleware, carrying the request and response, path parameters, bound data, and helpers for building responses.

func handler(c *echo.Context) error {
  // ...
  return nil
}

Reading input

id := c.Param("id")            // path parameter
q := c.QueryParam("q")         // query string value
all := c.QueryParams()         // url.Values of all query params
name := c.FormValue("name")    // form field (URL + body)
ua := c.Request().Header.Get(echo.HeaderUserAgent)

There are matching *Or helpers that return a default when a value is absent — c.ParamOr("id", "0"), c.QueryParamOr("page", "1"), c.FormValueOr(...).

Writing responses

c.String(http.StatusOK, "plain text")
c.JSON(http.StatusOK, payload)
c.JSONPretty(http.StatusOK, payload, "  ")
c.HTML(http.StatusOK, "<b>hi</b>")
c.XML(http.StatusOK, payload)
c.Blob(http.StatusOK, "application/pdf", bytes)
c.Stream(http.StatusOK, "application/octet-stream", reader)
c.NoContent(http.StatusNoContent)
c.Redirect(http.StatusFound, "/elsewhere")

Files

c.File("public/report.pdf")             // serve a file
c.Attachment("invoice.pdf", "inv.pdf")  // prompt download
c.Inline("photo.png", "photo.png")      // render inline

Per-request storage

Share data between middleware and handlers with Get/Set:

c.Set("user", u)
u, _ := c.Get("user").(*User)

Typed access is available via the generics helpers:

u, err := echo.ContextGet[*User](c, "user")

Binding & validation

c.Bind() parses request data into a struct; see Binding.

var dto CreateUser
if err := c.Bind(&dto); err != nil {
  return echo.ErrBadRequest
}