# What changed in pino-pretty

> 13 changes in pino-pretty 8 to 13 from its official release notes, upgrade guides and advisories: 2 breaking, 1 security. Each one cited. Sources checked 2026-10-26. HTML: https://unstale.sh/npm/pino-pretty/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## pino-pretty 13

### Breaking changes

- The unused, undocumented outputStream option was removed. (13.2.0) — [release notes](https://github.com/pinojs/pino-pretty/releases/tag/v13.2.0)

### Security

- Unsafe terminal control characters are stripped. (13.2.0) — [release notes](https://github.com/pinojs/pino-pretty/releases/tag/v13.2.0)

### Behavior and default changes

- Boolean options now support the string values "true" and "false". (13.2.0) — [release notes](https://github.com/pinojs/pino-pretty/releases/tag/v13.2.0)

### Fixes and other changes

- The include filter now supports nested keys. (13.2.0) — [release notes](https://github.com/pinojs/pino-pretty/releases/tag/v13.2.0)
- Newlines in messageFormat are now preserved. (13.2.0) — [release notes](https://github.com/pinojs/pino-pretty/releases/tag/v13.2.0)
- messageFormat now prints a value of 0 correctly. (13.1.3) — [release notes](https://github.com/pinojs/pino-pretty/releases/tag/v13.1.3)

## pino-pretty 12

### Breaking changes

- Support for Node.js 14 and 16 was dropped. (12.0.0) — [release notes](https://github.com/pinojs/pino-pretty/releases/tag/v12.0.0)

## pino-pretty 11

### Behavior and default changes

- Additional functionality is available for customPrettifiers. (11.0.0) — [release notes](https://github.com/pinojs/pino-pretty/releases/tag/v11.0.0)
- Additional functionality is available for messageFormat. (11.0.0) — [release notes](https://github.com/pinojs/pino-pretty/releases/tag/v11.0.0)
- options.customColors now supports objects. (11.0.0) — [release notes](https://github.com/pinojs/pino-pretty/releases/tag/v11.0.0)

## pino-pretty 10

### Behavior and default changes

- levelKey now supports nested keys. (10.0.0) — [release notes](https://github.com/pinojs/pino-pretty/releases/tag/v10.0.0)

## pino-pretty 9

### Behavior and default changes

- Line simplification for development was changed. (9.0.0) — [release notes](https://github.com/pinojs/pino-pretty/releases/tag/v9.0.0)

## pino-pretty 8

### Fixes and other changes

- Fixed cloning errors. (8.0.0) — [release notes](https://github.com/pinojs/pino-pretty/releases/tag/v8.0.0)