vlang
Implement JSON-RPC Module in V Standard Library
Describe the feature
Propose adding a comprehensive JSON-RPC 2.0 implementation to V's standard library as a standalone module at vlib/jsonrpc.
Use Case
JSON-RPC is a lightweight remote procedure call protocol that is widely used in:
- Language Server Protocol (LSP) implementations
- Blockchain and cryptocurrency APIs (Ethereum, Bitcoin)
- Microservices communication
- IoT device management
- AI/ML tooling (Model Context Protocol, OpenAI APIs)
Currently, V lacks a standardized way to handle JSON-RPC, forcing developers to implement protocol logic repeatedly. A standard implementation would:
- Enable better tooling (language servers, debug adapters)
- Facilitate integration with existing JSON-RPC-based services
- Provide foundation for higher-level protocols (like MCP)
- Reduce boilerplate in networked applications
Proposed Solution
No response
Other Information
No response
Acknowledgements
- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change
Version used
V 0.4.12 33e129b19e1124bb0cb6b057ee04324cc25409b4
Environment details (OS name and version, etc.)
| V full version | V 0.4.12 33e129b19e1124bb0cb6b057ee04324cc25409b4 |
|---|---|
| OS | linux, Ubuntu 20.04.6 LTS |
| Processor | 4 cpus, 64bit, little endian, aarch64 |
| Memory | 1.65GB/3.78GB |
| V executable | /home/vpn/github/lang/v/v |
| V last modified time | 2025-11-10 02:28:38 |
| V home dir | OK, value: /home/vpn/github/lang/v |
| VMODULES | OK, value: /home/vpn/.vmodules |
| VTMP | OK, value: /tmp/v_1001 |
| Current working dir | OK, value: /home/vpn/github/lang/v/vlib |
| Git version | git version 2.25.1 |
| V git status | weekly.2025.45-35-g33e129b1 |
| .git/config present | true |
| cc version | cc (Ubuntu 10.5.0-1ubuntu1~20.04) 10.5.0 |
| gcc version | gcc (Ubuntu 10.5.0-1ubuntu1~20.04) 10.5.0 |
| clang version | clang version 10.0.0-4ubuntu1 |
| tcc version | tcc version 0.9.27 mob:da11cf6 (AArch64 Linux) |
| tcc git status | thirdparty-linux-aarch64 ecc2f67a |
| emcc version | N/A |
| glibc version | ldd (Ubuntu GLIBC 2.31-0ubuntu9.18) 2.31 |
[!NOTE] You can use the 👍 reaction to increase the issue's priority for developers.
Please note that only the 👍 reaction to the issue itself counts as a vote. Other reactions and those to comments will not be taken into account.
Afaik the old VLS had a jsonrpc module in https://github.com/vlang/vls/tree/old_vls/jsonrpc . I have not reviewed it for completeness, but perhaps it could be used as is?
https://github.com/vlang/v-analyzer/tree/main/src/jsonrpc seems to have a more recent version of the same module.
jsonrpc should be provided as a standard library of v
I believe this should be a package instead.
