# Assertions

> For the complete documentation index, see [llms.txt](/llms.txt)

An assertion checks a condition at runtime and traps if it fails.

```motoko
let n = 10;
assert n % 2 == 1; // Traps
```

```motoko
let n = 10;
assert n % 2 == 0; // Succeeds
```

Assertions help catch logic errors early, but should not be used for regular [error handling](/languages/motoko/fundamentals/error-handling).