JSON-RPC
Also written: JSONRPC
A protocol for remote procedure calls using JSON to format messages, enabling programs to interact across networks.
JSON-RPC is a way for different computer programs to communicate with each other, even if they are running on different machines.
Think of it like ordering food from a restaurant. You send a request (your order) in a specific format (JSON) to the kitchen (another program). The kitchen processes your order and sends back a response (your food). JSON-RPC standardizes how these requests and responses are sent and received, making it easier for programs to work together.
For example, a web application might use JSON-RPC to ask a separate AI model service to generate text or analyze an image.
JSON-RPC is a lightweight remote procedure call (RPC) protocol. It uses JSON as its message format, defining methods to be called and parameters to be passed. A client sends a request object to a server, which then executes the specified method and returns a response object.
It supports both notification calls (where the client does not expect a response) and request calls. Its simplicity and the widespread adoption of JSON make it a common choice for inter-process communication, especially in web services and distributed systems.
Frontier AI labs are building complex systems that need to communicate between different services. Protocols like JSON-RPC allow these services, whether they are AI models or other backend components, to interact efficiently. This is crucial for creating sophisticated AI applications that can perform a wide range of tasks.
- Turn your REST APIs into MCP tools with Google Cloud API GatewayGoogle · Google Developers Blog ·
- Unlocking the Codex harness: how we built the App ServerOpenAI · OpenAI News ·
- Google Gemini
- Google Cloud API Gateway can expose REST APIs, which can then be accessed by AI agents, potentially using JSON-RPC for communication.
- OpenAI ChatGPT
- OpenAI's App Server standardizes access to its coding agent across multiple interfaces, suggesting a need for structured communication protocols like JSON-RPC.
- REST
- REST is an architectural style that uses HTTP methods (GET, POST, etc.) an
- gRPC
- gRPC is another RPC framework, but it uses Protocol Buffers for serializat
- WebSockets
- WebSockets provide a persistent, full-duplex communication channel b
JSON-RPC was first specified in 2005 by Tom MacTaggart. It aims to provide a simple, transport-agnostic way to invoke methods remotely using JSON. Source ↗
You can explore JSON-RPC by using tools like Postman or Insomnia to send requests to a public JSON-RPC API. Many blockchain nodes expose JSON-RPC interfaces that you can query to get information about the network. Look for documentation for a public API that lists its JSON-RPC endpoints and methods.
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Questions people ask
- Is JSON-RPC secure?
- JSON-RPC itself does not define security mechanisms. Security is typically handled at the transport layer (e.g., using HTTPS) or through application-level authentication and authorization.
- What is the difference between JSON-RPC and REST?
- REST is resource-oriented and uses standard HTTP methods, while JSON-RPC is procedure-oriented, focusing on calling specific functions or methods on a remote server.
First seen on Subvolts Feb 4, 2026. Updated Sep 30, 2026. Written by an AI model from the items above and reviewed against them weekly; report an error.