How To Model A Basic Record

Use this pattern when the wire contract is a single flat object and your F# record already matches that shape.

open CodecMapper
open CodecMapper.Schema

type Person = { Id: int; Name: string }
let makePerson id name = { Id = id; Name = name }

let codec =
    define<Person>
    |> construct makePerson
    |> field "id" _.Id
    |> field "name" _.Name
    |> Json.buildAndCompile

This is the smallest authored schema shape: define the record target, provide the constructor, then map each field explicitly and finish with Json.buildAndCompile.

type Person = { Id: int Name: string }

Multiple items
val int: value: 'T -> int (requires member op_Explicit)

--------------------
type int = int32

--------------------
type int<'Measure> = int

Multiple items
val string: value: 'T -> string

--------------------
type string = System.String

val makePerson: id: int -> name: string -> Person

val id: int

val name: string

val codec: obj