Free JSON to CSV Converter Online - No Signup

Turn JSON objects, arrays, or JSON Lines into clean CSV. Flatten nested fields, choose columns and delimiters, protect spreadsheet cells, preview records, and download the result.

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JSON and JSON Lines Nested-object flattening Secure CSV output No uploads

JSON to CSV Converter

Paste JSON or load a UTF-8 file, configure the CSV structure, and generate a validated downloadable file.

100% local processing
No network request, storage, or external parser

Ready. JSON content stays on this device.

Input size 0 B
Records 0
Columns 0
Input format -
Output size 0 B
Processing 0.0 ms

Shortcut: Ctrl/⌘ + Enter to convert

01
Private by design Data remains in your browser
02
Flexible JSON input Objects, arrays, and JSON Lines
03
Nested data support Flatten objects or preserve JSON
04
Safer spreadsheets Optional formula protection
Structured data conversion

Convert JSON into clean, portable CSV

This JSON to CSV Converter turns JSON objects, arrays, primitives, and JSON Lines into tabular CSV data directly inside your browser. No content is uploaded to an external parsing service.

Use first-seen union columns to retain fields found across every record, or use only the first record when you need a fixed schema. Missing values become empty fields.

Nested objects and arrays

Optional flattening converts nested object paths into names such as address.city. Arrays remain compact JSON strings inside a cell so their order and structure are preserved.

CSV safety and compatibility

CSV fields are quoted when required, internal quotes are doubled, and configurable formula protection can prefix potentially executable spreadsheet strings with an apostrophe.

Complete workflow

Everything needed for reliable JSON conversion

A responsive and privacy-focused interface for creating spreadsheet-ready or pipeline-ready CSV.

Local conversion

JSON parsing and CSV serialization happen on your device without server uploads.

JSON and JSON Lines

Convert a complete document or parse one JSON value from every nonblank physical line.

Nested-object flattening

Create dot-path columns while detecting path collisions before they can overwrite data.

Configurable CSV

Choose delimiters, line endings, quoting, headers, null values, and download encoding.

Formula protection

Reduce spreadsheet formula execution risk without modifying numeric values.

Bounded data preview

Inspect up to 50 rows and 30 columns in a scrollable, non-executable table.

Three simple steps

How to convert JSON to CSV

No software installation, registration, or file upload is required.

Step 1

Add JSON data

Paste a JSON document or select a UTF-8 JSON, JSONL, NDJSON, or text file.

Step 2

Configure the CSV

Choose columns, flattening, delimiter, quoting, line endings, and spreadsheet protection.

Step 3

Preview and download

Inspect the records, copy the CSV, or download a spreadsheet-compatible .csv file.

Column strategies

Union columns compared with first-record columns

All fields
First record only
Discovery Scans every record and adds each new field in first-seen order.
Discovery Uses only the properties found in the first normalized record.
Best for Irregular data where later records may introduce useful fields.
Best for Fixed schemas where unexpected later fields should not become columns.
Missing values Records without a discovered field receive an empty CSV cell.
Later fields Additional fields are omitted and reported in a visible warning.
Conversion guidance

Best practices for accurate JSON to CSV conversion

1

Use union columns for irregular records

This avoids omitting fields that appear only after the first object.

2

Review flattened column paths

Dot paths make nested objects tabular, while collision validation protects similarly named keys.

3

Keep formula protection enabled

This is especially important when untrusted strings will be opened in spreadsheet software.

4

Choose the delimiter for your destination

Commas are common, while semicolons and tabs may import more reliably in some locales and tools.

Common questions

JSON to CSV Converter FAQ

Is this JSON to CSV converter private?

Yes. JSON text and files are processed locally in your browser. This page does not upload your data to a server.

Which JSON structures can I convert?

You can convert a JSON object, an array of objects, arrays of values, primitive values, or JSON Lines. Each value is normalized into a CSV record.

Can the converter flatten nested JSON objects?

Yes. Optional flattening converts nested object paths into dot-separated columns. Arrays remain compact JSON strings, and conflicting flattened paths are rejected to prevent data loss.

How are JSON arrays written to CSV cells?

Arrays used as cell values are serialized as compact JSON. A root array represents multiple records, while a root array item that is itself an array becomes numbered columns.

What does spreadsheet formula protection do?

When enabled, string cells and headers that begin with =, +, -, or @ after optional whitespace receive a leading apostrophe to reduce formula execution risk in spreadsheet software.

How are commas, quotes, and line breaks escaped?

Fields containing a delimiter, double quote, line break, or edge whitespace are enclosed in double quotes, and every internal double quote is doubled.

Can I convert JSON Lines to CSV?

Yes. Select JSON Lines or use automatic detection. Each nonblank physical line must contain one complete valid JSON value.

Continue working

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Reverse conversion

CSV to JSON

Parse CSV text and files into JSON arrays or JSON Lines with validation and previews.

JSON utilities

JSON Formatter

Validate, format, minify, and inspect JSON data in a readable structure.

Data encoding

Base64 Encoder & Decoder

Encode UTF-8 text and files or restore Base64 content locally in your browser.

Ready to create clean CSV?

Convert JSON text or files privately with nested-field support, secure escaping, configurable output, and a useful table preview.

Open JSON to CSV Converter