JSON Pointer · lesson 2 of 6 · Basics

Keys & array indexes

The same /token syntax indexes arrays: use the zero-based position. Numbers aren't special on objects — there /10 is simply the key "10".

Example 1An array element

Document

{
  "store": {
    "book": [
      { "title": "Moby Dick", "price": 8.99 },
      { "title": "Ulysses", "price": 12.5 }
    ],
    "bicycle": { "color": "red" }
  }
}

Query

/store/book/0/title

/book The book array.
/0 An array index: zero-based, so 0 is the first element.
/title Its title → "Moby Dick".

Result

"Moby Dick"

Try it in the playground

Example 2A number used as an object key

Document

{ "10": "ten", "list": ["a", "b"] }

Query

/10

/10 On an object, 10 is just a key name; the same token on an array would be an index.

Result

"ten"

Try it in the playground

Good to know

Indexes have no sign and no leading zeros: /list/01 and /list/+1 don't match anything.