URL shortener, QR code generator, and link analytics API. Create short links, generate QR codes, and track click analytics.
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Jo4 is a modern URL shortening service with QR code generation and detailed link analytics.
All protected endpoints require an API key. Set your API key as an environment variable:
export JO4_API_KEY="your-api-key"
Get your API key from: https://jo4.io/api-keys
https://jo4-api.jo4.io/api/v1
curl -X POST "https://jo4-api.jo4.io/api/v1/protected/url" \ -H "X-API-Key: $JO4_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "longUrl": "https://example.com/very-long-url", "title": "My Link" }'
Request Body:
longUrltitledescriptionshortUrlexpirationTimepasswordProtectedpasswordUTM Parameters:
utmSourceutmMediumutmCampaignutmTermutmContentResponse:
{ "response": { "id": 123, "slug": "abc123", "shortUrl": "abc123", "fullShortUrl": "https://jo4.io/a/abc123", "longUrl": "https://example.com/very-long-url", "title": "My Link", "qrCodeUrl": "https://jo4.io/qr/abc123" } }
curl -X POST "https://jo4-api.jo4.io/api/v1/public/url" \ -H "Content-Type: application/json" \ -d '{"longUrl": "https://example.com"}'
Limited features, no analytics access.
curl -X GET "https://jo4-api.jo4.io/api/v1/protected/url/{slug}" \ -H "X-API-Key: $JO4_API_KEY"
curl -X GET "https://jo4-api.jo4.io/api/v1/protected/url/{slug}/stats" \ -H "X-API-Key: $JO4_API_KEY"
Response includes:
curl -X GET "https://jo4-api.jo4.io/api/v1/protected/url/myurls?page=0&size=20" \ -H "X-API-Key: $JO4_API_KEY"
curl -X PUT "https://jo4-api.jo4.io/api/v1/protected/url/{id}" \ -H "X-API-Key: $JO4_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "title": "Updated Title", "longUrl": "https://new-destination.com" }'
curl -X DELETE "https://jo4-api.jo4.io/api/v1/protected/url/{id}" \ -H "X-API-Key: $JO4_API_KEY"
Every short URL automatically gets a QR code at:
https://jo4.io/qr/{shortUrl}
Rate limits vary by plan:
Full OpenAPI/Swagger documentation: https://jo4-api.jo4.io/swagger-ui/index.html
curl -X POST "https://jo4-api.jo4.io/api/v1/protected/url" \ -H "X-API-Key: $JO4_API_KEY" \ -H "Content-Type: application/json" \ -d '{"longUrl": "https://example.com/article", "title": "Article"}'
curl -X POST "https://jo4-api.jo4.io/api/v1/protected/url" \ -H "X-API-Key: $JO4_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "longUrl": "https://mysite.com/landing", "title": "Q1 Campaign", "utmSource": "twitter", "utmMedium": "social", "utmCampaign": "q1-2026" }'
curl -X POST "https://jo4-api.jo4.io/api/v1/protected/url" \ -H "X-API-Key: $JO4_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "longUrl": "https://mysite.com/promo", "title": "Limited Offer", "expirationTime": 1738454400 }'
| Code | Meaning |
|---|---|
| 400 | Bad request - invalid parameters |
| 401 | Unauthorized - missing or invalid API key |
| 403 | Forbidden - insufficient permissions |
| 404 | Not found - URL doesn't exist |
| 429 | Rate limit exceeded |
No automatic installation available. Please visit the source repository for installation instructions.
View Installation Instructions
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