JSONPath · lesson 11 of 13 · Filters

Comparing with the rest of the document

Inside a filter, $ still means the document root, so an element can be compared with any other value in the document.

Example 1Books cheaper than the bicycle

Document

{
  "store": {
    "book": [
      { "title": "Sayings of the Century", "author": "Nigel Rees",
        "category": "reference", "price": 8.95 },
      { "title": "Sword of Honour", "author": "Evelyn Waugh",
        "category": "fiction", "price": 12.99 },
      { "title": "Moby Dick", "author": "Herman Melville",
        "category": "fiction", "price": 8.99, "isbn": "0-553-21311-3" },
      { "title": "The Lord of the Rings", "author": "J. R. R. Tolkien",
        "category": "fiction", "price": 22.99, "isbn": "0-395-19395-8" }
    ],
    "bicycle": { "color": "red", "price": 19.95 }
  }
}

Query

$.store.book[?@.price < $.store.bicycle.price].title

@.price The book's own price.
$.store.bicycle.price An absolute path back to the root: the bicycle's price, 19.95.

Result

"Sayings of the Century"
"Sword of Honour"
"Moby Dick"

Try it in the playground