JSON & JSONL to RFC-4180 CSV • 100% Client-Side
JSON to CSV Converter Online
Paste REST API responses, MongoDB exports, or .json / .jsonl files directly into the grid below. Inspect, clean or deduplicate rows visually, then download clean CSV, Semicolon CSV, or .xlsx.
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Drop XLSX, CSV, TSV, Markdown (.md), or JSON here
Runs locally inside browser memory. Multi-sheet workbooks open into tabs automatically.
1r × 1c used
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Zero Uploads
Combine Two or More Columns
Merge 2+ columns cleanly without writing formulas.
Preview
Split Column by Delimiter
Remove Duplicate Rows
Find & Replace
Sort Rows
Filter or Delete Matching Rows
Quick Cleanup:
Fill, Prefix / Suffix & Extract Column
Merge Multiple Files / VLOOKUP Join Sheets
Append rows from multiple files/tabs or join two sheets by a key column.
Option A: Stack / Append All Open Sheet Tabs
Option B: VLOOKUP / Left-Join Two Sheets by Key
Format Preview & Export Converter
Column Profiler & Quick Summary
| Col | Header | Filled | Blank | Unique | Dupes | Min / Max / Avg |
|---|
Paste CSV, TSV, Markdown Table, JSON, or HTML
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Why Developers Choose Local JSON Conversion
- No file size paywalls or API key risk: Customer tokens and financial payloads stay inside local browser RAM.
- Preserves string ZIP codes & IDs: Values like
"02134"keep their leading zero safely in the grid. - Clean before export: Rename JSON keys, delete columns, filter nulls, or export straight to SQL
INSERTscripts.