Convert CSV to JSON Online

Q: Does it convert JSON back to CSV?

Yes, our engine is bidirectional. Simply paste your JSON array of objects on the right side, and it will instantly output the formatted CSV on the left.

Instantly transform CSV data into JSON arrays, or convert JSON to CSV. 100% free and securely processed entirely in your browser.

Pretty Print JSON

Infer Data Types (Numbers/Booleans)

CSV Input

JSON Output

100% Client-Side Privacy

This CSV to JSON converter strictly operates inside your browser. Your sensitive CSV and JSON data is never uploaded to our servers, ensuring total data privacy and zero risk of interception.

How to Convert CSV to JSON

This tool offers seamless bidirectional conversion between CSV (Comma Separated Values) and JSON (JavaScript Object Notation). It operates entirely locally for maximum speed.

Step 1: Paste your tabular CSV data (including the header row) into the left text area.
Step 2: The tool will instantly parse the CSV and generate an array of JSON objects on the right side. The first row of the CSV is used as the keys for each object.
Step 3: Click the "Copy" button to save the output to your clipboard.

To convert JSON to CSV: Simply paste a JSON array of objects into the right text area. The engine will instantly format it as a valid CSV string on the left, extracting the object keys to form the header row.

Intelligent Type Inference

When converting from CSV (which is inherently all text) to JSON, data types can often get lost, resulting in JSON where numbers and booleans are wrapped in quotes (e.g., "123" instead of 123). Our engine includes a smart type inference layer:

Numbers: Strings containing only digits (or decimals) are natively cast to JSON integers or floats.
Booleans: Strings like "true", "false", "yes", or "no" (case-insensitive) are converted to native boolean literals.
Nulls: Empty fields can be treated as nulls rather than empty strings, ensuring cleaner data structures.

You can toggle this behavior using the "Infer Data Types" checkbox in the settings panel above.

Common Use Cases

API Mocking & Development: Developers often receive spreadsheet data from product managers that needs to be hardcoded into frontend applications or used as mock API responses. Converting a massive CSV to a JSON array makes it instantly consumable by JavaScript frameworks like React or Vue.
Data Export Formatting: When extracting data from a NoSQL database (like MongoDB), the output is typically JSON. Converting this raw JSON to CSV allows non-technical stakeholders to open and manipulate the data natively in Microsoft Excel or Google Sheets.
Configuration Pipelines: Translating tabular configuration tables (often maintained in Excel) into JSON config files for CI/CD deployment pipelines.

Frequently Asked Questions (FAQ)

Is this CSV to JSON converter free?

Yes, it is 100% free with no limits on usage or file size, provided your browser has enough memory to process the text locally.

Is my data uploaded to a server?

No. All CSV parsing and JSON formatting happens entirely within your web browser using client-side JavaScript. Your sensitive tabular data never leaves your device.

Does it convert JSON back to CSV?

Yes, our parsing engine is bidirectional. Simply paste your JSON array of objects on the right side, and it will instantly output the formatted CSV on the left.