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https://github.com/danielaparker/jsoncons.net

The JsonCons.Net libraries complement the System.Text.Json namespace with support for JSON Pointer, JSON Patch, JSON Merge Patch, JSONPath, and JMESPath.
https://github.com/danielaparker/jsoncons.net

csharp dotnet dotnet-core dotnetstandard jmespath json json-merge-patch json-patch json-pointer jsonpatch jsonpath jsonpointer

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The JsonCons.Net libraries complement the System.Text.Json namespace with support for JSON Pointer, JSON Patch, JSON Merge Patch, JSONPath, and JMESPath.

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# JsonCons.Net

|JsonCons.Utilities|JsonCons.JsonPath|JsonCons.JmesPath|
|:-:|:-:|:-:|
|NuGet version
NuGet version
|NuGet version
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|NuGet version
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The JsonCons.Net libraries include classes that complement the functionality of the
[System.Text.Json namespace](https://docs.microsoft.com/en-us/dotnet/api/system.text.json?view=netcore-3.1).
The libraries target .Net Standard 2.1.

The JsonCons.Net libraries offer support for:

- JSON Pointer as defined in [RFC 6901](https://datatracker.ietf.org/doc/html/rfc6901)
- JSON Patch as defined in [RFC 6902](https://datatracker.ietf.org/doc/html/rfc6902)
- JSON Merge Patch as defined in [RFC 7396](https://datatracker.ietf.org/doc/html/rfc7396)
- JSONPath as defined in [JsonCons JsonPath](https://danielaparker.github.io/JsonCons.Net/articles/JsonPath/Specification.html)
- JMESPath as defined in [JMESPath Specification](https://jmespath.org/specification.html)

## JSONPath and JMESPath

JSONPath allows you to select from a [JsonDocument](https://docs.microsoft.com/en-us/dotnet/api/system.text.json.jsondocument?view=net-5.0)
a list of [JsonElement](https://docs.microsoft.com/en-us/dotnet/api/system.text.json.jsonelement?view=net-5.0) instances
that belong to it. JMESPath allows you to transform a [JsonDocument](https://docs.microsoft.com/en-us/dotnet/api/system.text.json.jsondocument?view=net-5.0)
into another
[JsonDocument](https://docs.microsoft.com/en-us/dotnet/api/system.text.json.jsondocument?view=net-5.0).

For example, consider the JSON data
```json
string jsonString = @"
{
""Data"":[
{
""KeyOfInterest"":true,
""AnotherKey"":true
},
{
""KeyOfInterest"":false,
""AnotherKey"":true
},
{
""KeyOfInterest"":true,
""AnotherKey"":true
}
]
}
";

using JsonDocument doc = JsonDocument.Parse(jsonString);
```

JSONPath allows you to select the `KeyOfInterest` values like this:
```csharp
string path = "$.Data[*].KeyOfInterest";
IList results = JsonSelector.Select(doc.RootElement, path);
```
and the union of `KeyOfInterest` and `AnotherKey` values like this:
```csharp
string path = "$.Data[*]['KeyOfInterest', 'AnotherKey']";
IList results = JsonSelector.Select(doc.RootElement, path);
```
The first query produces
```json
[true,false,true]
```
and the second
```json
[true,true,false,true,true,true]
```
Note that each element in the result - `true`, `false`, `true` - corresponds to an element
at a specific location in the original JSON document. This is a feature of JSONPath.

JMESPath allows you to select the `KeyOfInterest` values like this:
```csharp
string expr = Data[*].KeyOfInterest;
JsonDocument result = JsonTransformer.Transform(doc.RootElement, expr);
```
and a multiselect hash of `KeyOfInterest` and `AnotherKey` values like this:
```csharp
string expr = "Data[*].{\"Key of Interest\" : KeyOfInterest, \"Another Key\": AnotherKey}";
JsonDocument result = JsonTransformer.Transform(doc.RootElement, expr);
```
The first query produces
```json
[true,false,true]
```
and the second
```json
[
{
"Key of Interest": true,
"Another Key": true
},
{
"Key of Interest": false,
"Another Key": true
},
{
"Key of Interest": true,
"Another Key": true
}
]
```

JMESPath, unlike JSONPath, can create new elements that are not in the original document.
JMESPath can transform, while JsonPath can only select.

## Documentation and Examples

Reference documentation is available [here](https://danielaparker.github.io/JsonCons.Net/ref/)

Code examples may be found at:

[JSON Pointer examples](https://github.com/danielaparker/JsonCons.Net/blob/main/examples/JsonPointer.Examples/JsonPointerExamples.cs)

[JSON Patch examples](https://github.com/danielaparker/JsonCons.Net/blob/main/examples/JsonPatch.Examples/JsonPatchExamples.cs)

[JSON Merge Patch examples](https://github.com/danielaparker/JsonCons.Net/blob/main/examples/JsonMergePatch.Examples/JsonMergePatchExamples.cs)

[JSONPath examples](https://github.com/danielaparker/JsonCons.Net/blob/main/examples/JsonPath.Examples/JsonPathExamples.cs)

[JMESPath examples](https://github.com/danielaparker/JsonCons.Net/blob/main/examples/JmesPath.Examples/JmesPathExamples.cs)