fsprojects/FSharp.Json

50.9

Adequate · 24 September 2026

1.3k

lines of production code

F#

primary language

5

measurements over time

What this system is

FSharp.Json is a .NET library that provides reflection-based JSON serialization and deserialization for F\# types. It supports a wide range of primitive types, complex structures like records and unions, and handles null values and custom naming conventions. The system includes comprehensive test coverage to ensure correct handling of various F\# data types and JSON formats.

Features

Initial project structure and documentation

The repository was initialized with a standard .NET solution structure, including the FSharp.Json and FSharp.Json.Tests projects, along with essential configuration files like .gitignore and LICENSE.txt. The project is now ready for development with a comprehensive README.md that serves as the primary documentation, detailing usage examples, API overview, and supported types for JSON serialization.

(repo-wide) · high confidence

Behavioural changes

Expanded support for F\# primitive types and null values in JSON serialization

The FSharp.Json library now supports serialization and deserialization for a broader range of F\# primitive types, including int16, uint16, int32, uint32, int64, uint64, bigint, single, byte, and sbyte. The library also adds support for null values during serialization, allowing Option types with None to be serialized as JSON null or omitted based on configuration. Additionally, the library now supports TimeSpan formatting and allows more than two JSON fields in union key-value deserialization, improving compatibility with complex JSON structures.

FSharp.Json · high confidence

Test coverage

Expanded test coverage for F\# JSON serialization and deserialization

Added comprehensive test suites for the FSharp.Json library, covering serialization and deserialization of records, enums, unions, tuples, options, and collections. The new tests validate handling of primitive types (byte, sbyte, int16/32/64, single, float, decimal, char, Guid, DateTime, DateTimeOffset, TimeSpan), null values, custom naming conventions (lowerCamelCase, snakeCase), and various union modes (CaseKeyAsFieldValue, CaseKeyDiscriminatorField).

FSharp.Json.Tests · high confidence

Dependencies

Initial release of F\# JSON serialization library and test project

The F\# JSON serialization library (FSharp.Json) is introduced as a new package targeting .NET Standard 2.0, providing reflection-based JSON serialization capabilities. A corresponding test project (FSharp.Json.Tests) is added, targeting .NET 6.0, and references the main library along with NUnit and Microsoft Test SDK packages.

(dependencies) · high confidence

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

How this codebase got here

This is the PUBLIC form of this artifact. Findings are listed in full, but the details of SECURITY findings — which rule fired, in which file, on which line, and how to fix it — are deliberately withheld, and any secret-scanner results are excluded entirely. Where detail is absent here it was REMOVED FOR PUBLICATION; it is not missing from the analysis. The complete artifact is available from the repository owner.

Score

CAI 49 → 51 (+2.2)
Rubric changed (rubric-2026.08.19 → rubric-2026.09.15) — scores are not directly comparable.

Lenses

Code Health 87 → 86 (-0.7)
Architecture 100 → 100 (-0.0)
Maturity 29 → 29 (+0.0)
Readiness 58 → 60 (+2.1)
Security 59 → 71 (+12.1)

Resolved (9)

Duplicated block (6 lines × 2) (FSharp.Json/Core.fs)
Duplicated block (8 lines × 2) (FSharp.Json/Core.fs)
High: security finding (details withheld)
High: security finding (details withheld)
High: security finding (details withheld)
High: security finding (details withheld)
No exposed public API
Test reliability not included
dormant codebase — no living knowledge left to concentrate

New (17)

Documentation: no installation or build instructions (README.md)
Documentation: no usage examples (README.md)
Duplicated block (5 lines × 2) (FSharp.Json/Core.fs)
Duplicated block (7 lines × 5) (FSharp.Json/JsonValueHelpers.fs)
Duplicated block (8 lines × 2) (FSharp.Json/Core.fs)
Duplicated block (8 lines × 4) (FSharp.Json/JsonValueHelpers.fs)
End-of-life runtime: .NET net6.0
High: security finding (details withheld)
High: security finding (details withheld)
High: security finding (details withheld)
High: security finding (details withheld)
Medium: security finding (details withheld)
Medium: security finding (details withheld)
Medium: security finding (details withheld)
Medium: security finding (details withheld)
No dependency advisory monitoring
Outdated: FSharp.Core

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

Survey your own repository

fsprojects/FSharp.Json was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point a surveyor at a repository you know and see whether you agree with it.

About this page

The score is its most recent published measurement, taken on 24 September 2026 at a pinned commit. It is not a live figure and does not change until the project is measured again.
Measured at commit 434a5754d113c850f24418f639027ff039564a97 — the exact code this score is about.
Scored under rubric-2026.09.15 — the same rubric and the same method as every other entry in this index.
Measured by watchdog.canine.dev using codehealth-analyzer preprod-923689c465cf.