Client-Side Engine Popular

JSON to CSV Converter

Convert JSON to CSV or CSV to JSON instantly in your browser. Supports nested objects, custom delimiters, Excel TSV export, and drag-and-drop file upload. 100% free, no upload, no limits.

Delimiter:

Header RowFlattenQuotes

JSON Input0 chars

CSV Output0 chars

PapaParse In-Browser Engine

RFC 4180 CSV Standard

Placement Slot: horizontal

Local Execution Guarantee: Data processed strictly in your browser. No files or inputs are sent to remote servers.

Standard: 100% In-Browser

How to Use JSON to CSV Converter

Step 01

Paste or Upload Your File

Paste your JSON or CSV text into the input panel, or drag-and-drop a .json / .csv file directly.

Step 02

Choose Options

Select your delimiter (Comma, Tab for Excel, Semicolon, or Pipe), toggle the header row, and enable nested object flattening for complex API responses.

Step 03

Copy or Download

The converted output updates instantly. Click "Copy" to copy to clipboard, or "Download" to save the file directly to your device.

Capabilities & Standards

✓ 100% In-Browser — your files never leave your device (100% private)

✓ Dual-mode: JSON to CSV and CSV to JSON with 1-click swap

✓ Automatic nested object flattening (e.g. user.address.city)

✓ Custom delimiter: Comma, Semicolon, Tab (Excel TSV), or Pipe

✓ Drag-and-drop file upload — .json, .csv, .tsv files up to 15MB

✓ One-click Copy to Clipboard and direct .csv / .json file download

Developer Reference

Programmatic Implementation & Code Snippets

Copy-Paste Ready

Automating this workflow in your backend services, build scripts, or terminal pipelines? Copy these verified, idiomatic code examples:

Python Convert JSON to CSV with Python Pandas

import pandas as pd

# Load JSON file or string
df = pd.read_json('input.json')

# Export to CSV without index column
df.to_csv('output.csv', index=False)
print("Successfully converted JSON to CSV!")

Node.js Convert JSON Array to CSV in Node.js

import fs from 'fs';

const rawData = JSON.parse(fs.readFileSync('input.json', 'utf8'));
if (rawData.length > 0) {
  const headers = Object.keys(rawData[0]).join(',');
  const rows = rawData.map(item =>
    Object.values(item).map(val => `"${String(val).replace(/"/g, '""')}"`).join(',')
  );
  const csv = [headers, ...rows].join('\n');
  fs.writeFileSync('output.csv', csv);
}

Bash Convert JSON to CSV using jq CLI

# Using jq to export keys and values to CSV
jq -r '(.[0] | keys_unsorted) as $keys | $keys, map([.[ $keys[] ]])[] | @csv' input.json > output.csv

Frequently Asked Questions

Is my data safe? Does it get uploaded to a server? ▼

No data is ever uploaded or transmitted. All JSON-to-CSV and CSV-to-JSON conversions run entirely inside your browser using JavaScript. Your data never leaves your device.

Can this tool handle nested JSON objects? ▼

Yes! Enable the "Flatten Nested" option and deeply nested objects like { "user": { "address": { "city": "Lahore" } } } will be automatically flattened to a single "user.address.city" column in the CSV output.

How do I convert JSON to Excel? ▼

Select "Tab (TSV / Excel)" as the delimiter and click Download. Open the downloaded file in Microsoft Excel or Google Sheets — tab-separated values are natively recognized as spreadsheet columns.

What is the maximum file size supported? ▼

Files up to 15 MB can be processed entirely in the browser with no network latency. For very large datasets, processing may take a few seconds and is handled by your device's memory.

Does this work without an internet connection? ▼

Once the page is loaded, conversions work completely offline because all processing runs locally in your browser with zero server calls.

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