[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Bytes](https://evolu.dev/docs/api-reference/common/Bytes) › decodeLength

```ts
const decodeLength: (
  buffer: Buffer,
) => number &
  Brand<"NonNaN"> &
  Brand<"Finite"> &
  Brand<"Int"> &
  Brand<"NonNegative"> = decodeNonNegativeInt;
```

Defined in: [packages/common/src/Bytes.ts:383](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Bytes.ts#L383)

Decodes an array-like value length.

Decodes a non-negative integer from a variable-length integer format.

https://en.wikipedia.org/wiki/Variable-length_quantity