← Business
🧾
Invoice Generator: Fill, Preview, Print
Fill out a form, watch a real invoice build itself live, then print or export it.
🟡 MediumDifficulty
3-4 hoursTime
Python, JavaScript, TypeScriptLanguages
What you're building
You're building a genuinely usable invoice tool: a form where you type in your business info, a client's info, and line items with quantities and prices, and watch a clean, professional-looking invoice preview build itself on the right side of the screen in real time. Add as many line items as you need, taxes and totals calculate automatically, and when you're done you can either print it straight to PDF with your browser's print dialog or download it as a CSV file for your records.
What you'll unlock 🔓
You'll need
- Basic HTML forms
- Basic JavaScript (DOM, events, arrays)
- A code editor
- A browser
🗺️ Build roadmap
01 Build the two-column layout (form + preview)
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02 Build the business and client info fields
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03 Build dynamic add/remove line item rows
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04 Wire the form to update the live preview
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05 Calculate subtotal, tax, and total automatically
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06 Add print-friendly styling
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07 Add CSV export with the Blob API
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