Can it convert nested JSON?

Yes. By enabling the "Flatten Nested" option, nested objects are flattened using dot notation (e.g., user.address.city) and output as a single CSV column.

Is my data sent to a server?

No, your data is never sent anywhere. All conversions are executed purely in your browser using JavaScript, ensuring your sensitive data and API keys remain completely secure.

Do you support Tab-Separated Values (TSV)?

Yes. You can select "Tab" from the delimiter dropdown to input or output TSV files. We also support semicolon delimiters for European CSV formats.

Can it handle large files?

Yes, it can handle files within the limits of your browser's memory. Files around a few megabytes up to 10MB will process smoothly. Processing tens of thousands of rows is practically issue-free.

What about special characters or foreign languages?

There will be no encoding issues. This tool processes everything using UTF-8 encoding, correctly handling multilingual characters. BOMs in UTF-8 files are automatically detected and removed.

How does it handle CSVs without headers?

When converting CSV to JSON, uncheck the "Has Header" option. The tool will automatically assign keys like col1, col2, col3... to prevent the first data row from being mistakenly read as a header.

Can it convert a single JSON object instead of an array?

Yes. A single object like {"name":"John"} is automatically converted into a single-row CSV. You don't need to wrap it in an array.

What happens if there is an error?

JSON syntax errors (like missing brackets or trailing commas) are displayed in red text. If a CSV row has mismatched column counts, a warning is logged to the console, but the processing continues.

🔄

json-csv-converter,

JSON ↔ CSV Converter

Instantly convert between JSON and CSV

🔄

Bidirectional

JSON ⇔ CSV

📄

Flexible Input

File & Text

🔒

Local Process

100% Secure

🔒

Data is NEVER sent to our servers. Everything is processed locally in your browser.

Direction:

JSON → CSV CSV → JSON

Delimiter:

Flatten Nested

Input

Output

Rows:0

Error:None

about,

About

A fully browser-based tool to convert bidirectionally between JSON and CSV formats. Supports both file loading and direct text pasting.

Features include flattening nested JSON structures, selectable delimiters (Comma/Tab/Semicolon), and RFC 4180-compliant CSV parsing.

All processing is completed locally in your browser without sending any data to our servers, ensuring your confidential data remains safe.

how to,

How to Use

STEP 1

Select Direction

Choose whether you want to convert JSON to CSV or CSV to JSON.

STEP 2

Input Data

Select a file from your device or paste the text directly into the input area.

STEP 3

Convert & Save

Click the Convert button to instantly see results. Copy or download the output.

glossary,

Glossary

JSON (JavaScript Object Notation): A lightweight data-interchange format that uses human-readable text to store and transmit data objects consisting of attribute-value pairs.
CSV (Comma-Separated Values): A delimited text file that uses a comma to separate values. It is widely used to represent tabular data for spreadsheets and databases.
TSV (Tab-Separated Values): A variant of CSV where fields are separated by tab characters. It helps prevent parsing errors when data naturally contains commas.
RFC 4180: The standard specification document for the CSV format. It defines rules like using double quotes to escape fields containing commas or line breaks.
Nested JSON: A hierarchical structure where a JSON object contains other objects or arrays within it.
Flatten: The process of expanding a nested hierarchical structure into single keys separated by dots, making it suitable for flat CSV columns.
Delimiter: A character used to specify the boundary between separate, independent regions in plain text (e.g., comma, tab, semicolon).
UTF-8 Encoding: The most common character encoding on the World Wide Web, capable of representing text in almost any language.

faq,

FAQ

Q.Can it convert nested JSON?: Yes. By enabling the "Flatten Nested" option, nested objects are flattened using dot notation (e.g., user.address.city) and output as a single CSV column.
Q.Is my data sent to a server?: No, your data is never sent anywhere. All conversions are executed purely in your browser using JavaScript, ensuring your sensitive data and API keys remain completely secure.
Q.Do you support Tab-Separated Values (TSV)?: Yes. You can select "Tab" from the delimiter dropdown to input or output TSV files. We also support semicolon delimiters for European CSV formats.
Q.Can it handle large files?: Yes, it can handle files within the limits of your browser's memory. Files around a few megabytes up to 10MB will process smoothly. Processing tens of thousands of rows is practically issue-free.
Q.What about special characters or foreign languages?: There will be no encoding issues. This tool processes everything using UTF-8 encoding, correctly handling multilingual characters. BOMs in UTF-8 files are automatically detected and removed.
Q.How does it handle CSVs without headers?: When converting CSV to JSON, uncheck the "Has Header" option. The tool will automatically assign keys like col1, col2, col3... to prevent the first data row from being mistakenly read as a header.
Q.Can it convert a single JSON object instead of an array?: Yes. A single object like {"name":"John"} is automatically converted into a single-row CSV. You don't need to wrap it in an array.
Q.What happens if there is an error?: JSON syntax errors (like missing brackets or trailing commas) are displayed in red text. If a CSV row has mismatched column counts, a warning is logged to the console, but the processing continues.

use cases,

Use Cases

📊

Data Analysis Prep

Convert JSON data fetched from APIs into CSV to analyze it in Excel or Google Sheets.

🔧

Developer Tools

Convert CSV master data files into JSON format to embed directly into applications.

📁

Data Migration

Easily transform data formats to migrate records between different database systems.

📝

Report Generation

Convert raw JSON logs into CSV to aggregate and summarize using pivot tables.

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