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Migrate from Newtonsoft.Json to System.Text.Json #83
Description
Long-tail consolidation — currently both Newtonsoft.Json and System.Text.Json are in the dependency graph. Newtonsoft.Json is used directly in several places + dragged in by NJsonSchema.NewtonsoftJson. System.Text.Json is the modern standard and ships with .NET.
Scope:
- Replace direct usages of
Newtonsoft.Json.Linq/JsonConvertetc. withSystem.Text.Json. Largest call sites likely inFallout.Utilities.Text.Json,Fallout.SolutionModel,Fallout.GlobalToolparameters file handling. - Replace
NJsonSchema.NewtonsoftJsonwithNJsonSchemaconfigured to useSystem.Text.Json(NJsonSchema supports it natively). - Drop
Newtonsoft.JsonPackageVersion.
Bigger lift; benefits: one fewer dep, modern JSON pipeline, smaller package graph.
Refs the dependency audit.
Activity
chore(deps): start Newtonsoft → System.Text.Json migration in Strongl…
chore(deps): start Newtonsoft → System.Text.Json migration in Strongl…
ChrisonSimtian commentedon May 22, 2026
Scoping done. Migration broken into 6 sub-issues (this issue stays as the umbrella tracker; closes when all six close):
JObject.Parse/JsonConvertcallsitesFallout.Utilities.Text.Jsonto STJFallout.Tooling(blocked on STJ-3)Fallout.Tooling.Generator(blocked on STJ-3)Fallout.Common.Tools.*TasksAPI integrationsAnchor work landed:
StronglyTypedSolutionGeneratormigrated to STJ in 54a1655 (parameters.json read, the simplest isolated callsite).Three of the six sub-issues are independent and pickable now: STJ-1, STJ-2, STJ-6. STJ-4/STJ-5 wait on STJ-3, which is the breaking-change one and needs deliberate scheduling against a major release.
chore(deps): drop Newtonsoft.Json from Fallout.SourceGenerators (#83 …
feat(net): STJ overloads for HTTP JSON helpers, [Obsolete] Newtonsoft…
feat(utilities.text.json): STJ overloads for keystone JsonExtensions …
feat(text.json): JsonObject helpers + migrate 3 pragma'd callers off …
chore(text.json): [Obsolete] remaining Newtonsoft surface + migrate S…
feat(utilities.text.json)!: remove Newtonsoft surface — STJ-3 of #83 (#…
feat!: close the #83 Newtonsoft migration tree — STJ-6, STJ-2 tail (#119
ChrisonSimtian commentedon May 25, 2026
Closed — entire STJ migration tree complete. STJ-1 #114, STJ-2 #115, STJ-3 #116, STJ-4 #117, STJ-5 #118, STJ-6 #119. No Fallout source uses Newtonsoft.Json anymore; the package survives in the closure only as a transitive of NuGet.Packaging + Serilog.Formatting.Compact.Reader.