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18
technology/tools/JSONPatch.md
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@ -39,7 +39,7 @@ A JSON Patch document is just a [JSON](../files/JSON.md) file containing an arra
## JSON Pointer
JSON Pointer ([IETF RFC 6901](https://datatracker.ietf.org/doc/html/rfc6901/)) defines a string format for identifying a specific value within a [JSON](../files/JSON.md) document. It is used by all operations in JSON Patch to specify the part of the document to operate on.
A JSON Pointer is a string of tokens separated by `/` characters, these tokens either specify keys in objects or indexes into arrays. For example, given the [JSON](../files/JSON.md)
A JSON Pointer is a string of tokens separated by `/` characters, these tokens either specify keys in objects or indexes into arrays. For example, given the [JSON](../files/JSON.md)
```json
{
"biscuits": [
@ -49,13 +49,13 @@ A JSON Pointer is a string of tokens separated by `/` characters, these tokens
}
```
`/biscuits` would point to the array of biscuits and `/biscuits/1/name` would point to `"Choco Leibniz"`.
`/biscuits` would point to the array of biscuits and `/biscuits/1/name` would point to `"Choco Leibniz"`.
To point to the root of the document use an empty string for the pointer. The pointer `/` doesn’t point to the root, it points to a key of `""` on the root (which is totally valid in [JSON](../files/JSON.md)).
To point to the root of the document use an empty string for the pointer. The pointer `/` doesn’t point to the root, it points to a key of `""` on the root (which is totally valid in [JSON](../files/JSON.md)).
If you need to refer to a key with `~` or `/` in its name, you must escape the characters with `~0` and `~1` respectively. For example, to get `"baz"` from `{ "foo/bar~": "baz" }` you’d use the pointer `/foo~1bar~0`.
If you need to refer to a key with `~` or `/` in its name, you must escape the characters with `~0` and `~1` respectively. For example, to get `"baz"` from `{ "foo/bar~": "baz" }` you’d use the pointer `/foo~1bar~0`.
Finally, if you need to refer to the end of an array you can use `-` instead of an index. For example, to refer to the end of the array of biscuits above you would use `/biscuits/-`. This is useful when you need to insert a value at the end of an array.
Finally, if you need to refer to the end of an array you can use `-` instead of an index. For example, to refer to the end of the array of biscuits above you would use `/biscuits/-`. This is useful when you need to insert a value at the end of an array.
## Operations
### Add
@ -63,7 +63,7 @@ Finally, if you need to refer to the end of an array you can use `-` instead o
{ "op": "add", "path": "/biscuits/1", "value": { "name": "Ginger Nut" } }
```
Adds a value to an object or inserts it into an array. In the case of an array, the value is inserted before the given index. The `-` character can be used instead of an index to insert at the end of an array.
Adds a value to an object or inserts it into an array. In the case of an array, the value is inserted before the given index. The `-` character can be used instead of an index to insert at the end of an array.
### Remove
```json
@ -75,7 +75,7 @@ Removes a value from an object or array.
{ "op": "remove", "path": "/biscuits/0" }
```
Removes the first element of the array at `biscuits` (or just removes the “0” key if `biscuits` is an object)
Removes the first element of the array at `biscuits` (or just removes the “0” key if `biscuits` is an object)
### Replace
```json
@ -89,14 +89,14 @@ Replaces a value. Equivalent to a "remove" followed by an "add".
{ "op": "copy", "from": "/biscuits/0", "path": "/best_biscuit" }
```
Copies a value from one location to another within the [JSON](../files/JSON.md) document. Both `from` and `path` are JSON Pointers.
Copies a value from one location to another within the [JSON](../files/JSON.md) document. Both `from` and `path` are JSON Pointers.
### Move
```json
{ "op": "move", "from": "/biscuits", "path": "/cookies" }
```
Moves a value from one location to the other. Both `from` and `path` are JSON Pointers.
Moves a value from one location to the other. Both `from` and `path` are JSON Pointers.
### Test
```json