I Built a Free REST API for Developer Tools (JSON, Base64, JWT, UUID, and More)

#webdev #javascript #api #tools

Every developer needs a handful of utility tools: format some JSON, decode a JWT, generate a UUID, test a regex. Usually you'd open a browser tab, paste your data into some random website, and hope it's not logging your secrets.

I built DevKits API — a free REST API that brings these tools to your code, your terminal, or your AI assistant.

What's Available

12 endpoints covering the most common developer utility tasks:

Endpoint	What it does
`POST /api/json/format`	Format + validate JSON
`POST /api/base64/encode`	Encode to Base64
`POST /api/base64/decode`	Decode from Base64
`POST /api/jwt/decode`	Decode a JWT payload
`GET /api/uuid/generate`	Generate UUID v4
`POST /api/hash/generate`	MD5/SHA-1/SHA-256/SHA-512
`POST /api/regex/test`	Test a regex pattern
`POST /api/url/encode`	URL encode/decode
`POST /api/markdown/to-html`	Convert Markdown to HTML
`POST /api/diff/compare`	Text diff
`POST /api/cron/parse`	Human-readable cron schedule

Quick Start

# Generate a UUID
curl https://api.aiforeverthing.com/api/uuid/generate
# → {"success":true,"data":{"uuids":["550e8400-e29b-41d4-a716-446655440000"]}}

# Format JSON
curl -X POST https://api.aiforeverthing.com/api/json/format \
  -H 'Content-Type: application/json' \
  -d '{"json":"{\"name\":\"Alice\",\"age\":30}"}'

# Decode a JWT
curl -X POST https://api.aiforeverthing.com/api/jwt/decode \
  -H 'Content-Type: application/json' \
  -d '{"token":"eyJhbGciOiJIUzI1NiJ9..."}'

JavaScript SDK

There's also a zero-dependency npm package:

npm install devkits-client

const { createClient } = require('devkits-client');
const devkits = createClient();

const { uuids } = await devkits.uuid.generate();
const { encoded } = await devkits.base64.encode('Hello!');
const { hash } = await devkits.hash.generate('password', 'sha256');

MCP Server for AI Assistants

If you use Claude, Cursor, or any MCP-compatible AI, there's also an MCP server:

{
  "mcpServers": {
    "devkits": {
      "command": "npx",
      "args": ["devkits-mcp-server"]
    }
  }
}

This lets your AI assistant call these tools directly without any copy-paste.

API Playground

You can try every endpoint live at aiforeverthing.com/api/playground.html — no signup required.

Free vs Pro

Free: 100 requests/day per IP — more than enough for dev use
Pro: Unlimited requests + priority support ($9/month)

The free tier works without any API key. Just call the endpoints.

Built on Cloudflare Workers

The API runs on Cloudflare Workers at the edge — low latency everywhere, no cold starts, 99.99% uptime SLA from Cloudflare's infrastructure.

All source code patterns are documented at the API docs page.

If this is useful to you, ⭐ the GitHub repo or share with your team. Happy building!

DEV Community