Web Connector 25.2
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# lookup

The `lookup` method returns the value at the specified path in the JSON object.

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

## Syntax

    lookup( pathElements )

## Arguments

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

## Returns

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

## Example

    myJsonObject = LuaJsonObject:new()
    myJsonObject:assign( {
            attr1=LuaJsonObject:new( { n=42, x=5 } ),
            attr2=LuaJsonArray:new( 1, 2, "three" ),
        } )

    print ( myJsonObject:lookup("attr2",2):value() )
    -- three (LuaJsonArrays are zero-indexed)

    -- Modifying the returned value changes the original object
    local lookup_attr = myJsonObject:lookup("attr1"):object()
    lookup_attr:assign("y",3)
    print (myJsonObject:string())
    -- {"attr1":{"n":42,"x":5,"y":3},"attr2":[1,2,"three"]}

## See Also

- lookupByPath

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Version 25.2 | Last updated April 2025

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Product: Knowledge Discovery Web Connector 25.2

Topic Title: lookup