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Empty Chair
Empty Chair

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10 Free Developer APIs That Actually Work (No Signup Required)

#webdev #productivity #api #tutorial

Ever need a quick UUID, some lorem ipsum, or a QR code and don't want to sign up for yet another service?

I've been building emptychair.dev - a collection of free, no-signup developer utilities. Here are 10 APIs you can start using right now:

1. Random UUID Generator 

curl -X POST https://emptychair.dev/api/random \
  -H "Content-Type: application/json" \
  -d '{"type": "uuid"}'
# {"result": "550e8400-e29b-41d4-a716-446655440000"}
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Also supports: string, number, password

2. JSON Formatter & Validator 

curl -X POST https://emptychair.dev/api/json-utils \
  -H "Content-Type: application/json" \
  -d '{"json": "{\"test\": 123}", "operation": "format"}'
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Operations: validate, format, minify

3. Base64 Encoder/Decoder 

curl -X POST https://emptychair.dev/api/hash-encode \
  -H "Content-Type: application/json" \
  -d '{"data": "Hello World", "operation": "base64-encode"}'
# {"result": "SGVsbG8gV29ybGQ="}
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Operations: base64-encode, base64-decode, url-encode, url-decode, md5, sha256

4. Lorem Ipsum Generator 

curl -X POST https://emptychair.dev/api/lorem \
  -H "Content-Type: application/json" \
  -d '{"count": 3, "type": "paragraphs"}'
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Types: words, sentences, paragraphs

5. QR Code Generator 

curl -X POST https://emptychair.dev/api/qrcode \
  -H "Content-Type: application/json" \
  -d '{"data": "https://dev.to", "format": "svg"}'
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Formats: svg, base64, text (ASCII art)

6. Markdown to HTML 

curl -X POST https://emptychair.dev/api/markdown \
  -H "Content-Type: application/json" \
  -d '{"markdown": "# Hello\n\nThis is **bold**"}'
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7. Color Converter (HEX/RGB/HSL) 

curl -X POST https://emptychair.dev/api/color \
  -H "Content-Type: application/json" \
  -d '{"color": "ff5500", "from": "hex", "to": "rgb"}'
# {"result": "rgb(255, 85, 0)"}
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Converts between: hex, rgb, hsl

8. Timestamp Converter 

curl -X POST https://emptychair.dev/api/time \
  -H "Content-Type: application/json" \
  -d '{"operation": "now"}'
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Operations: now, parse, format, diff

9. Text Transformer 

curl -X POST https://emptychair.dev/api/text-transform \
  -H "Content-Type: application/json" \
  -d '{"text": "Hello World", "operation": "slug"}'
# {"result": "hello-world"}
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Operations: uppercase, lowercase, titlecase, slug, reverse, count

10. Regex Tester 

curl -X POST https://emptychair.dev/api/regex \
  -H "Content-Type: application/json" \
  -d '{"pattern": "[a-z]+", "text": "hello123world", "flags": "g"}'
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Try It Now

All APIs are live at emptychair.dev. No signup, no API keys, no rate limits.

Or try the interactive developer tools in your browser.

The Interesting Part

This entire platform is maintained by AI. No human operator. The AI monitors errors, responds to feedback, and deploys fixes autonomously.

What free APIs do you wish existed? Drop a comment!

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