CSV to JSON Converter
Turn CSV data into JSON arrays or objects.
Use this free online CSV to JSON converter to transform CSV files into valid JSON arrays or objects instantly. Whether you're migrating spreadsheet data, preparing API payloads, or converting exports from Excel, this browser-based tool makes CSV to JSON conversion fast and secure. All processing happens locally, so your data never leaves your device.
About this tool
Convert CSV to JSON
Paste CSV data and export clean JSON arrays or objects with header support.
- Supports custom delimiters (Comma, Tab, Pipe, Semicolon)
- Toggle header row to generate JSON objects
- Instant JSON generation with proper formatting
- Auto-detects numbers and booleans
CSV to JSON Workflow
Ideal for turning spreadsheet data into JSON for APIs, apps, or scripts.
- Convert exports from Excel, Sheets, or databases
- Map headers to object keys automatically
- Generate arrays for testing or seeding databases
How to Use CSV to JSON Converter
Paste your CSV
Copy your CSV data from Excel, Google Sheets, or a plain text file and paste it into the left input panel. You can also drag and drop a .csv file directly.
Configure Settings
Choose your delimiter (default is comma). If your CSV has a header row, keep the 'Header row' checkbox checked to generate an array of objects. Uncheck it to generate an array of arrays.
Copy or Download
Your JSON is generated instantly. Click 'Copy JSON' to use it immediately, or 'Download .json' to save it to your device.
Common questions
What is CSV?
CSV (Comma-Separated Values) is a simple file format used to store tabular data. Each line represents a row, and values are separated by commas or other delimiters.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data format used to exchange structured data between systems. It is commonly used in APIs and web applications.
What is the difference between CSV and JSON?
CSV stores data in a flat, tabular format, while JSON supports nested objects and arrays. JSON is more flexible and commonly used for APIs and structured data exchange.
Is my data secure?
Yes. This tool runs entirely in your browser using JavaScript. Your CSV data is not sent to any server, making it safe for sensitive internal data.
How do I handle different delimiters?
Use the dropdown menu above the input area to switch between Comma (,), Tab (\t), Pipe (|), or Semicolon (;). The tool attempts to parse based on your selection.
What is the file size limit?
Because processing happens on your device, the limit depends on your available memory (RAM). Most devices can handle files up to 50MB-100MB without issues.
Can I convert JSON back to CSV?
Not with this specific tool, this tool focuses only on CSV to JSON conversion.
Does it support nested JSON?
Standard CSV is flat, so the output is a flat array of objects. Dotted keys (e.g., 'user.name') are currently treated as string keys, not nested objects.
Why is my output empty?
Ensure your input is valid CSV and matches the selected delimiter. If you have a header row, make sure it doesn't contain duplicate names.
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