String Utility Belt MCP server

String Utility Belt

stringutilitybelt.com · Usage guide · All utilities · Integrations

Chain string transformations into visual pipelines with live, per-step previews. 246 utilities — encodings, hashes, ciphers, compression, data formats (JSON/YAML/TOML/CSV/XML), line and text operations, analysis, generators, web/dev helpers, numbers, dates and colours — all running client-side, with the same engine available as a CLI, an HTTP API, an MCP server, a browser extension and a VS Code extension.

Use it from your agent, terminal or editor

Every utility also runs on your own machine, outside the browser:

# Give Claude Code (or any MCP client) exact hashing, encoding and decoding instead of a guess
claude mcp add subelt -- npx -y @string-utility-belt/mcp

# Pipe text through a pipeline from the shell
echo 'eyJ1c2VyIjoiYWRhIn0=' | npx subelt base64_decode json_pretty

utility, run a pipeline, detect a format); config for Claude Desktop, Cursor and other clients in its README.

• MCP server — @string-utility-belt/mcp: five tools (search, describe, run a

(also on Open VSX for Cursor and VSCodium) and the Chrome extension.

• CLI — subelt: steps as arguments, stdin to stdout, share links and pipeline files.
• Editors and browsers — the VS Code extension

• Library — @string-utility-belt/core, the engine with every utility, for your own code.

Features

Shortened. The full README is on GitHub.