To Bool | Basic

Boolean sockets are picky: they want a true or false, and they'll refuse a number or a string outright. ToBool ("To Bool | Basic") is the adapter that makes anything boolean-able. It takes a value of any type - the input socket is the wildcard * that accepts whatever you plug in - applies Python's truthiness, and outputs a BOOLEAN.

The mechanism is bool(any): numbers become false only at 0, non-empty strings become true, empty strings become false, and so on. There's also an optional invert toggle (default false); flip it and the result is flipped before it leaves the node - a built-in NOT so you don't need a second node.

The inputs that matter

• any - whatever you want to coerce. Accepts INT, FLOAT, STRING, BOOLEAN, or anything else that comes down the wire.
• invert - optional; when true, negates the result.

Why you'd reach for it

This is the cleanup node for mixed-type graphs. The classic case: some other node hands you a 1 or a 0, or a string like "true", and you need to feed a boolean switch. Instead of restructuring upstream, drop a ToBool on the wire. It's also the polite way to convert a number into a condition - 0 → false, anything else → true - which is genuinely useful when a node signals state through a count.

Two truthiness traps to know about, because they're the difference between "this works" and "silently backwards." First, the string "false" is true. Any non-empty string - including "false", "0", and "no" - evaluates to true. If you're converting text output, don't expect "false" to mean false. Second, empty values are false: empty string, zero, and empty collections all convert to false. That's usually what you want, but it's worth stating.

Installing it

Standard pack install - pure Python, zero dependencies:

cd ComfyUI/custom_nodes
git clone https://github.com/akatz-ai/ComfyUI-Basic-Math

Restart ComfyUI, find it under Basic Math ➕ → Conversion as "To Bool | Basic". Or use ComfyUI Manager → **Install Custom Nodes → search "ComfyUI-Basic-Math"`.

The gotchas

The "false"-string behavior above is the one that bites. If you're ever converting text flags from a node that outputs "true"/"false" as strings, route it through ToBool knowing you'll get true for both - you'd want StringComparison against the literal text first if that distinction matters. And remember the | Basic suffix on the menu name, same as every node in this pack.