jsonpath-ts
v0.1.1
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JSONPath Typescript
Type inference for JSONPath queries, as per the JSONPath query expressions RFC (see limitations below).
npm i jsonpath-ts
Usage
import { Parse } from "jsonpath-ts";
type Result = Parse<"$.store.book[*].author[2:6]", Data>;
// ^? ["Herman Melville", "J. R. R. Tolkien"]
// Given input type
export type Data = {
store: {
book: [
{
category: "reference";
author: "Nigel Rees";
title: "Sayings of the Century";
price: 8.95;
},
{
category: "fiction";
author: "Evelyn Waugh";
title: "Sword of Honour";
price: 12.99;
},
{
category: "fiction";
author: "Herman Melville";
title: "Moby Dick";
isbn: "0-553-21311-3";
price: 8.99;
},
{
category: "fiction";
author: "J. R. R. Tolkien";
title: "The Lord of the Rings";
isbn: "0-395-19395-8";
price: 22.99;
}
];
bicycle: {
color: "red";
price: 399;
};
};
};
Limitations
- Slice steps not supported (
::-1
) - Filtering not supported (
[email protected]
) - Descendant segments not supported (
$...X
)
How does it work?
This implementation first converts the input path into an abstract, shallow ordered tree of Selector
s, such as NameSelector
, IndexSelector
etc. This representation is then iterated over to retrieve the derive the correct type from the data.
This functionality can be imported independently via:
import {
ParsePath, // Input path -> ParsedPath
ExtractValue // ParsedPath -> Return data type
} from "jsonpath-ts