Devtools runs on your own machine — the client starts it, so there is no endpoint to ping. 33 installs a week from npm. Last commit 18 Mar 2026.
23 developer utilities — base64, JWT, UUID, hash, QR, regex, timestamps. No API keys.
Today is the operative word: we check Devtools every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add devtools -- npx -y mcp-devtools-server
{
"mcpServers": {
"devtools": {
"args": [
"-y",
"mcp-devtools-server"
],
"command": "npx"
}
}
}
[mcp_servers.devtools]
command = "npx"
args = ["-y", "mcp-devtools-server"]
{
"mcpServers": {
"devtools": {
"args": [
"-y",
"mcp-devtools-server"
],
"command": "npx"
}
}
}
{
"mcpServers": {
"devtools": {
"args": [
"-y",
"mcp-devtools-server"
],
"command": "npx"
}
}
}
Developer utilities MCP: base64, UUID, hash, JWT decode, cron, timestamps.
Deterministic dev utilities: UUIDs, hashes, encoding, JWT, cron, regex. No network, no API key.
12 local developer tools: JSON, Base64, JWT, regex, hash, UUID, Markdown, diff, cron.
Developer utilities: color conversion, WCAG contrast, timestamps, UUIDs, and hashing.
Local-first MCP server for text, JSON, Base64, CSV, regex, and developer utilities.
65+ free in-browser developer tools (JSON, Base64, JWT, hash, regex…) callable over MCP.
36 local developer utilities for AI agents. Hash, encoding, UUID, JWT, JSON, network, text.
7 utility tools in here: exchange rate, UUID, hash, Base64, timestamp, calculator, unit conversion.
Answers built from our own checks of this server.