Controller 26.3
Controller Reference

# lookupByPath

The `lookupByPath` method returns the value at the specified path in the JSON array.

NOTE: This method does not make a copy of the value, so modifying the returned value affects the original array.

## Syntax

    lookupByPath( path )

## Arguments

Argument | Description
--- | ---
`path` | (string) The path of the value to return. Construct the path from array indexes and object attribute names, and use a slash (`/`) as the separator. If an object attribute name includes a slash, then escape the slash with a backslash, for example `"one\\/two"`. Notice that you must also escape a backslash with another backslash.

## Returns

(LuaJsonValue) Returns the value that exists at the specified path, or `nil` if the specified path does not exist.

## Example

    local myJsonObject = LuaJsonObject:new( { product="IDOL" , version=11 } )
    local myJsonArray = LuaJsonArray:new("zero",1,2,myJsonObject)

    local myValue = myJsonArray:lookupByPath("3/product")
    print (myValue:value())
    -- IDOL

## See Also

- lookup

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Version 26.3 | Last updated July 2026

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Product: Knowledge Discovery Controller 26.3

Topic Title: lookupByPath