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SessionState.has()

Checks if a key exists in session state.

Function Signature​

SessionState.has(key: string): boolean

Parameters​

  • key (string): The key to check

Return Value​

  • boolean: true if the key exists, false otherwise

Description​

SessionState.has() checks whether a key exists in session state. This is useful before retrieving values to avoid working with empty strings.

Example​

-- Check if key exists before using
if SessionState.has("userAuthenticated") then
    local status = SessionState.get("userAuthenticated")
    Logger.info("Auth status: " .. status)
else
    Logger.warn("User not authenticated")
end

-- Conditional logic based on state
if SessionState.has("processedData") then
    -- Process the data
    local data = SessionState.get("processedData")
    outputs.result = data
else
    -- Initialize default data
    SessionState.set("processedData", "default")
end

Node Structure Example​

This function is typically used in node scripts for conditional logic:

-- In a node script
if SessionState.has(inputs.key) then
    outputs.exists = "true"
else
    outputs.exists = "false"
end

Notes​

  • Returns false for non-existent keys
  • Keys are case-sensitive
  • Always use this before SessionState.get() if you need to distinguish between empty values and missing keys