grpcurl review
A focused, free command-line tool for inspecting and invoking gRPC services.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
grpcurl is an open-source command-line client for developers who need to interact with gRPC servers directly. It sends and receives JSON-encoded request data, invokes RPC methods, and works with unary, client-streaming, server-streaming, and bidirectional-streaming calls. The tool is suited to desktop command-line workflows where inspecting services or making targeted requests matters more than using a hosted interface or graphical workspace.
Its strongest capability is schema-aware gRPC exploration. Server reflection can expose available services and methods, while local .proto source files and compiled protoset files provide another way to load service definitions. grpcurl can list services and methods, describe services, methods, and message types, and export proto files or protoset descriptors. It also supports request headers and gRPC metadata, giving developers control over call context while working from the terminal. TLS, mutual-TLS, and plaintext connections are supported, so the same command-line focus applies across different endpoint configurations.
The trade-off is its narrow scope. grpcurl is built for gRPC operations rather than broader API coverage: it does not support GraphQL or WebSocket APIs, and it does not provide automated tests, API documentation, or team workspaces. Its free, open-source model fits developers who want a specialized utility for service discovery, schema inspection, and RPC invocation, including those building command-line tools with its Go library. Teams seeking shared workspaces, documented API collections, or testing workflows should choose a product designed around those capabilities instead.
grpcurl pros and cons
- Where it wins
- Supports unary and all major gRPC streaming RPC patterns
- Handles TLS, mutual-TLS, and plaintext connections
- Discovers and describes schemas through reflection or proto files
- Where it doesn't
- Focused on gRPC rather than GraphQL or WebSocket APIs
- Does not include automated testing workflows
- Does not include team workspaces or API documentation
grpcurl fact sheet, pricing and score →
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