PatternsTools & Utilities

CSV / TSV ↔ JSON tabular export

Paste CSV, TSV, or JSON arrays; detect delimiters with Papa Parse; validate rectangular rows; preview in a table; export JSON, CSV, TSV, or Markdown tables in the browser.

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Problems solved

Technical challenges this implementation handles out of the box.

Convert pasted CSV, TSV, or JSON arrays into a rectangular table
Detect delimiters and validate rows with Papa Parse
Export JSON, CSV, TSV, or GitHub-flavored Markdown tables in-browser

Use cases

Products and workflows this pattern is designed to support.

Spreadsheet interchange utilities
API fixture editing
Markdown table generation
Offline tabular data cleanup

Setup

Requirements, wiring steps, and what this pattern adds to your project.

Getting started

Pick how you want to pull this pattern in — then wire env vars and routes the same way.

1
Install from the preview toolbar
Copy the install command above and run it in your project — Pro patterns include a short-lived token.
2
Customize the agent and tool files
Adapt prompts, tools, and stop conditions for your product — Copy for AI in the toolbar helps seed that work.
3
Run your dev server and open the pattern route
Install dependencies if needed, then start the app and verify responses.

Files added

3 files

app/page.tsx
app/layout.tsx
README.md

Dependencies

17 total

npm packages

@hugeicons-pro/core-stroke-rounded@hugeicons/reactfile-saverNext.jspapaparseReactsonner

Registry components

buttoncardcheckboxemptylabelscroll-areaselecttabletabstextarea

Critical files

lib/tabular-export.ts
Papa Parse for CSV/TSV with optional header row and delimiter override; JSON array parsing; rectangular validation; GFM pipe-table export; file-saver downloads for JSON, CSV, TSV, Markdown.