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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitches.NET 10 adds an ASP.NET Core JSON Patch implementation based on System.Text.Json. To use it, install the Microsoft.AspNetCore.JsonPatch.SystemTextJson NuGet package, bind a patch document to JsonPatchDocument<T>, and apply it to the target model with ApplyTo. The new implementation is not a drop-in replacement for the older Newtonsoft.Json-based one, and your API—not the library—must decide which client-requested changes are safe.
What changed in .NET 10?
ASP.NET Core 10 introduces JSON Patch support based on System.Text.Json through the Microsoft.AspNetCore.JsonPatch.SystemTextJson package. It provides JsonPatchDocument<TModel> and custom serialization and deserialization for JSON Patch documents. Microsoft describes the implementation as offering improved performance and reduced memory use compared with the legacy implementation, but does not provide a numeric benchmark in the cited release notes. Microsoft’s ASP.NET Core 10 release notes
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The package is separate from the framework’s older Newtonsoft.Json-based implementation. Microsoft explicitly warns that the System.Text.Json implementation “isn’t a drop-in replacement” for the legacy one. It does not support dynamic types such as ExpandoObject. Before migrating, check the target models your application patches, how patch documents are serialized and deserialized, and how your endpoints handle application errors. Microsoft Learn: JSON Patch in ASP.NET Core web API
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A JSON Patch document is an ordered array of operations against a JSON-shaped resource. The standard operations are add, remove, replace, move, copy, and test. Each operation uses a slash-separated path; array indexes are zero-based, and - can identify the end of an array for an append, such as /addresses/-. Microsoft Learn: JSON Patch in ASP.NET Core web API
#1 Best Overall
In an ASP.NET Core controller, the common flow is to accept a JsonPatchDocument<TModel>, apply it to the model with ApplyTo, then validate and persist the resulting resource according to your API’s rules. Microsoft also documents a Minimal API pattern using MapPatch. The endpoint determines how binding failures and operation errors are reported, so define and test that behavior rather than assuming every invalid patch produces the same response.
Applying a patch in an endpoint
The essential controller pattern is to receive the typed document and call ApplyTo on the resource being changed. The package supplies the patch document type and serialization support; the endpoint remains responsible for locating the resource, checking the caller’s permissions, validating the result, and saving it.
Rank #2
[HttpPatch("{id}")]
public IActionResult Patch(int id, JsonPatchDocument<Product> patch)
{
if (patch is null)
return BadRequest();
var product = FindProduct(id);
if (product is null)
return NotFound();
patch.ApplyTo(product);
if (!ModelState.IsValid)
return ValidationProblem(ModelState);
// Apply domain validation and persist the product here.
return Ok(product);
}This illustrates the shape of the flow, not a complete application: FindProduct, persistence, authorization, and domain validation depend on your API. Follow the package and framework documentation for the exact endpoint setup for your project. Microsoft Learn: JSON Patch in ASP.NET Core web API
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JSON Patch application is atomic: if an operation fails, none of the operations in the list is applied. A client should therefore treat a failed patch as unapplied and retrieve or reconcile resource state using the API’s contract. Microsoft Learn: JSON Patch in ASP.NET Core web API
How to choose between the System.Text.Json and Newtonsoft.Json implementations
| Consideration | System.Text.Json implementation (.NET 10) | Legacy implementation |
|---|---|---|
| Package and serialization | Microsoft.AspNetCore.JsonPatch.SystemTextJson; System.Text.Json-based serialization. |
Uses Newtonsoft.Json integration. |
| Model compatibility | Dynamic types such as ExpandoObject are unsupported. |
Compatibility depends on the existing Newtonsoft.Json-based setup; check your application’s target models. |
| Applying patches and handling errors | Uses JsonPatchDocument<TModel> and ApplyTo; verify how your endpoint captures and returns errors. |
Review the current endpoint’s patch-application and error-handling behavior before changing implementations. |
| Security | Does not make arbitrary client-supplied changes safe; the application must control what may be changed. | Also requires application-level controls over permitted changes. |
For migration, first identify the document and model shapes your app relies on, then check its JSON configuration, patch parsing and creation paths, and failure handling. This is especially important if a patch target is dynamic or your clients depend on undocumented serialization behavior. The warning that the implementations are not interchangeable does not mean every behavior differs; test the areas your application actually uses.
Security: decide what clients may change
Microsoft warns that JSON Patch has inherent security risks and that the ASP.NET Core implementation does not attempt to mitigate them. Treat the operation list and its paths as untrusted input. A successfully parsed patch is not, by itself, authorization to change every field on the model. Microsoft Learn: JSON Patch in ASP.NET Core web API
Rank #4
- Allow only the operations and paths appropriate for the resource and caller.
- Enforce authorization before applying changes; do not expose sensitive or server-controlled fields for client editing.
- Validate domain rules after applying the patch, including relationships and invariants that span multiple fields.
- Test invalid paths, unsupported operations, failed operations, and the endpoint’s error responses.
These checks belong to the application because the library does not decide which changes are safe for your domain.
Package and version scope
The documentation and release notes cited here cover ASP.NET Core 10.0. Microsoft’s API reference lists the package-provided Microsoft.AspNetCore.JsonPatch.SystemTextJson v10.0.0 API. Confirm the package version and behavior against the framework version your project targets. Microsoft API reference: System.Text.Json JSON Patch API for ASP.NET Core 10.0
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