Answer Server 12.13

# exists

The `exists` method checks whether a specified path exists in the JSON value.

## Syntax

    exists( pathElements )

## Arguments

Argument | Description
--- | ---
`pathElements` | (json_path_string_or_integer) The path to check. Specify one or more path elements, which might be object attribute names (strings) or array indexes (integers).

## Returns

(Boolean) Returns `true` if the path exists, `false` otherwise.

## Example

Consider the following JSON:

    {
      "product": "IDOL",
      "component": "CFS",
      "version": { "major": 11, "minor": 3 },
      "ports": [
        { "type": "ACI", "number": 7000 },
        { "type": "Service", "number": 17000 }
      ]
    }

If this JSON is represented by a `LuaJsonValue` object named `myJsonValue`, you could use the `exists` method as follows:

    print (myJsonValue:exists("ports",0,"type"))
    -- true (LuaJsonArrays are zero-indexed)

    print (myJsonValue:exists("ports",2,"type"))
    -- false (LuaJsonArrays are zero-indexed, and there is no third value)

    print (myJsonValue:exists("version", "major"))
    -- true

## See Also

- existsByPath

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Version 12.13 | Last updated October 2022

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Product: IDOL Answer Server 12.13

Topic Title: exists