Stof

Stof is a document format that combines data and executable logic in a single file for safe execution.

Stof is a document format containing data and functions that applications run in a sandbox, in-process, using Rust, JavaScript, or Python. Any valid JSON document functions as a valid Stof document, allowing users to add types and functions where needed and export back to JSON, YAML, or TOML. Every part of the document, including functions, is treated as data, enabling merging, diffing, storing in databases, or transmitting over the wire as compact binary. Documents adapt dynamically by parsing or dropping fields and functions at runtime without any build step. Applications extend the system by adding custom functions, types, and schemas live, and Rust developers can implement custom formats and data types.

Stof at a glance

Best for: Software engineer
Runs on: Web, CLI, VS Code
Pricing: Free
Released: October 2026
Category: AI coding tool
Website: stof.dev

Key features

Stores data and logic in a single document
Runs code in a sandbox, in-process
Supports Rust, JavaScript, and Python
Exports to JSON, YAML, and TOML
Parses new fields and functions at runtime
Sends logic over the wire as compact binary
Provides a VS Code extension for editing

Use it for

Running AI-generated logic and rules safely
Replacing custom config formats and domain-specific languages
Executing identical logic in browsers, servers, and workers
Changing application behavior by sending new documents
Traveling logic alongside data through APIs and databases

Alternatives to Stof

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jscpd — A native Rust binary that runs fast without a Node.js runtime and integrates with AI agents.
OpenSandbox — Provides isolated environments with multi-language SDKs and lifecycle management.
BScaff — Builds and recreates project structures and snippets instantly.
zerostack — Minimal memory footprint and high CPU efficiency compared to JS-based agents.
pstack — Improves AI coding agent outcomes with rigorous workflows.
TS Rust — It runs type checking twice as fast as the TypeScript Go compiler.
BeautifulRust — It improves agent output using guidelines from five major Rust sources.
Weft — It enables safe parallel coding agent work without file locks.

All Stof alternatives