An n8n workflow automation that turns Telegram into a personal expense tracker. Users send /expense commands with amount, category, and notes; the workflow parses and validates the input, appends valid entries to a Google Sheets expense ledger, and replies with a confirmation receipt. Invalid messages trigger a helpful usage guide reply directly in the Telegram chat.

Code FlowZap complet

chat { # Chat
n1: rectangle label:"Telegram Trigger - New Message" system:"Telegram"
n2: rectangle label:"Code - Parse /expense amount category note" system:"n8n"
n1.handle(right) -> n2.handle(left) [label="Message"]
}

validate { # Validate
n3: diamond label:"IF: Parse successful?" system:"n8n"
n2.handle(right) -> validate.n3.handle(left) [label="Parsed fields"]
}

ledger { # Ledger
n4: rectangle label:"Google Sheets - Append Expense Row" system:"Google Sheets"
n5: rectangle label:"Telegram - Reply Confirmation" system:"Telegram"
validate.n3.handle(right) -> ledger.n4.handle(left) [label="Yes"]
ledger.n4.handle(right) -> ledger.n5.handle(left) [label="Receipt"]
}

errors { # Errors
n6: rectangle label:"Telegram - Reply Usage Help" system:"Telegram"
validate.n3.handle(bottom) -> errors.n6.handle(top) [label="No → Help"]
}

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