| Product | Buf |
| Website | buf.build |
| Category | API Development / Protocol Buffers |
| Pricing | Free (open source CLI), Team $40/user/mo, enterprise custom |
What Is Buf?
Buf is a modern toolchain for Protocol Buffers (Protobuf) development. It replaces the protoc compiler with a faster, more reliable CLI that adds linting, breaking change detection, and managed code generation. The Buf Schema Registry (BSR) provides a central registry for sharing and versioning Protobuf schemas.
Protobuf is the standard for defining APIs in microservice architectures, but the official tooling (protoc) is notoriously difficult: fragile plugin management, no schema validation, no breaking change detection. Buf fixes all of this.
Key Features
Lint and Format
Enforce style and correctness rules across your Protobuf files. The linter catches common mistakes (missing package declarations, incorrect field numbering, naming convention violations) before they reach code review. The formatter ensures consistent style across teams.
Breaking Change Detection
Run buf breaking against a previous version to detect backwards-incompatible changes: removed fields, changed types, renumbered fields. Critical for API-first development where breaking a schema can break every service that depends on it.
Managed Code Generation
Generate client and server code in any language (Go, TypeScript, Java, Python, Rust, Swift) from a single command. Buf manages plugins as remote modules instead of locally installed binaries, eliminating the “install protoc-gen-go version 1.31.0 but not 1.32.0” problem.
Buf Schema Registry
Publish and consume Protobuf schemas as versioned modules. The BSR is a central registry (like npm for schemas) where teams share API definitions. Import schemas with dependency management, versioning, and generated documentation.
Who Is This For?
- Teams using Protobuf/gRPC for inter-service communication
- API-first organizations that need schema governance
- Anyone frustrated with
protocplugin management - Platform teams managing shared API schemas
Pros
- Breaking change detection for API safety
- Managed code generation (no local plugin installs)
- Schema linting and formatting
- Central schema registry (BSR)
- Free, open-source CLI
- Faster than protoc
Cons
- Only useful if you use Protobuf
- BSR team plan is $40/user/mo
- Migration from protoc requires config changes
- Learning curve for buf.yaml/buf.gen.yaml
- Vendor lock-in for BSR features
Verdict
Buf is the best Protobuf toolchain available. If your organization uses Protocol Buffers, switching from protoc to Buf is one of the highest-ROI developer tooling changes you can make. Breaking change detection alone prevents the class of bugs that causes outages in microservice architectures.
The free CLI covers linting, formatting, breaking change detection, and code generation. The paid BSR adds schema sharing and collaboration. For teams that treat their Protobuf schemas as the source of truth for their API surface, Buf is essential.