FSharp.Data.YamlValue 0.2.1

.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. .NET Standard 2.0 This package targets .NET Standard 2.0. The package is compatible with this framework or higher. 
dotnet add package FSharp.Data.YamlValue --version 0.2.1
                    


                    

                
NuGet\Install-Package FSharp.Data.YamlValue -Version 0.2.1
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="FSharp.Data.YamlValue" Version="0.2.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="FSharp.Data.YamlValue" Version="0.2.1" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="FSharp.Data.YamlValue" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add FSharp.Data.YamlValue --version 0.2.1
                    


                    

                
#r "nuget: FSharp.Data.YamlValue, 0.2.1"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package FSharp.Data.YamlValue@0.2.1
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=FSharp.Data.YamlValue&version=0.2.1
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=FSharp.Data.YamlValue&version=0.2.1
                    


                            Install as a Cake Tool

FSharp.Data.YamlValue

A YAML document API for F#, in the shape of FSharp.Data's JsonValue.

Parse YAML into a discriminated union you can pattern match, navigate with the ? dynamic operator, read with AsInteger()-style accessors, and write back out — including comments. Hand-written parser, zero dependencies, netstandard2.0/net8.0, AOT-compatible, and Fable-compatible (JavaScript and Python).

Install

dotnet add package FSharp.Data.YamlValue

Quick start

open FSharp.Data
open FSharp.Data.YamlExtensions

let info =
    YamlValue.Parse """
    name: Tomas          # given name
    born: 1985
    siblings:
      - Anna
      - Petr
    """

info?name.AsString()     // "Tomas"
info?born.AsInteger()    // 1985

for sibling in info?siblings do
    printfn "%s" (sibling.AsString())

Editing with SetPath/GetPath

YamlBuilders adds an immutable edit API with a string-path DSL, beyond what JsonValue offers:

open FSharp.Data.YamlValueBuilders

let doc = YamlValue.Parse """
name: myapp
services:
  web:
    image: nginx
"""

let updated = doc.SetPath("services.web.image", YamlValue.String "nginx:1.27")
updated.TryGetPath("services.web.image")   // Some (YamlValue.String "nginx:1.27")

Source positions and timestamp text

ParseWithPositions also returns the line/column/offset span of every node, keyed by JSON Pointer; ParseWithMetadata additionally keeps the original text of timestamps. Parse is unchanged.

let value, spans = YamlValue.ParseWithPositions "name: web\nports:\n  - 80\n"
spans.["/ports/0"].Start.Line      // 3

let parsed = YamlValue.ParseWithMetadata "released: 2026-10-14"
parsed.TimestampText.["/released"]  // "2026-10-14"

Learn more

License

MIT

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 was computed.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
0.2.1 87 10/24/2026
0.2.0 99 10/23/2026
0.1.1 128 9/12/2026
0.1.0 121 9/11/2026

The package now ships its F# sources and project file under `fable/` so it can be consumed from Fable JS and Python with a plain `PackageReference`; 0.2.0 only worked via a project reference (consumers failed with "Fable packages must include F# sources"). The `lib/` DLLs and the .NET public API are unchanged.