NEXORA
An experimental programming language built around explicit requirements and checkable contracts.
NEXORA is its own language, with its own syntax, type checker and interpreter. The reference
interpreter is implemented in Python; programs are NEXORA programs, not Python translations.
Version 0.15.0 · Early-stage, pre-1.0. The supported language is a
subset of the full design and may change incompatibly. NEXORA programs are not recommended for
production software. The public Playground is live in production; that describes the hosted service,
not the maturity of the language for production applications.
What works today
- Language and CLI: static checking and interpretation, functions, lists, records, modules,
Option and Result, refined types, examples, and function contracts. The CLI includes run,
check, test, inspect, context and symbols. See the implemented language and status.
- Diagnostics: type and syntax errors explain the problem and include stable codes and hints.
- Editor support: a shared Language Server Protocol (LSP) server provides diagnostics,
completion, hover, navigation, rename, symbols, signature help and formatting. Ready-to-use
configurations are available for Neovim, Helix and Emacs; the
Visual Studio Code extension uses the same language tools. The LSP resolves
relative imports across the open project and negotiates UTF-8, UTF-16 or UTF-32 positions with
the editor.
- Web Playground: write, check and run NEXORA online,
with multi-file projects, an explicit entry file and a statement-by-statement debugger. The
production service runs a previous interpreter release in a Docker worker; network and external-process
capabilities are unavailable to Playground programs.
- AI tooling: optional context and symbol tools, a Python API and an experimental MCP server.
NEXORA does not call AI models. The MCP server's compatibility has only been checked with the
official SDK client and manually in Claude Code; see AI tooling.
The design document describes the larger language being explored. It is a
proposal, not a promise that every feature already runs. See the current limitations
and roadmap before relying on a feature.
Install
The interpreter needs Python 3.11 or newer. Install the published package from PyPI:
python -m pip install nexora-lang
nex --version
The nexora-lang package is also available on npm as a launcher; it still requires Python 3.11 or
newer. Installation details and troubleshooting are in the NEXORA guide.
First program
Save this as hello.nex:
fn main() {
print("Hello from NEXORA")
}
Then run it:
nex run hello.nex
Project map
The website and Playground server live in a separate private repository; the language implementation
and its documentation are here.
License: MIT.
