Free online CSV to JSON converter. Convert CSV data to JSON format with automatic header detection, custom delimiters (comma, tab, semicolon, pipe), and intelligent type inference. Bidirectional with table preview. 100% browser-based — your data never leaves your device.
100% browser-based — your data never leaves your device
Convert CSV data to JSON format with support for headers and custom delimiters.
Copy your CSV text and paste it into the input area. Ensure the first row contains headers.
Choose the delimiter that matches your CSV: comma, tab, semicolon, or pipe.
Click Convert to JSON. Copy the resulting JSON array or download it as a .json file.
Drop a file here or click to browse
Ctrl+Enter to convert to json
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CSV to JSON Converter is a free online json tool that convert csv data to json format with support for headers and custom delimiters. It works entirely in your browser — no downloads, no installations, and no server uploads required. backend developers, frontend engineers, DevOps engineers use CSV to JSON Converter when they need a fast, privacy-respecting way to process json data without installing additional software. It supports capabilities such as header detection, custom delimiters, type inference. Additional features include local only. Common use cases include migrating spreadsheet data to json for api development, converting csv exports from databases to structured json, preparing test data from csv files for frontend development. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes CSV to JSON Converter ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
CSV to JSON Converter is a free online json tool that helps you convert csv data to json format with support for headers and custom delimiters. Key capabilities include header detection, custom delimiters, type inference. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to migrating spreadsheet data to json for api development.
Copy your CSV text and paste it into the input area. Ensure the first row contains headers.
Choose the delimiter that matches your CSV: comma, tab, semicolon, or pipe.
Click Convert to JSON. Copy the resulting JSON array or download it as a .json file.
| Category | Details |
|---|---|
| Input Limits | Maximum file size: Browser memory bound (~2 GB) |
| Nesting depth: Unlimited (browser stack limit) | |
| Supported Formats | JSON, JSONC (with comments), JSON5 (extended syntax) |
| Browser Engine |
|
All operations run entirely in your browser using built-in JSON APIs. No server uploads, no data storage, and no third-party requests.
CSV to JSON Converter is ideal when you need to migrating spreadsheet data to json for api development without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For for persistent editing environments with linting, consider using VS Code with JSON extension. For for server-side JSON processing in scripts, jq (command-line) may be a better fit. CSV to JSON Converter fills the gap between heavyweight desktop tools and insecure online services that require uploading your data.
Yes. The first row of your CSV is treated as headers and becomes the JSON object keys. Each subsequent row becomes a JSON object.
Fields enclosed in double quotes are handled correctly. This allows commas and special characters within field values.
You can choose from Comma (,), Tab, Semicolon (;), or Pipe (|). Select the delimiter that matches your CSV format.
Automatically detects and uses the first row as JSON keys, or generates numeric keys if no headers are present.
Supports commas, tabs, semicolons, pipes, and custom delimiters for maximum compatibility.
Automatically detects numbers, booleans, nulls, and strings to produce clean typed JSON.
Your data never leaves your browser. 100% client-side CSV to JSON conversion.
CSV to JSON Converter is useful in a variety of scenarios across different workflows:
Migrating spreadsheet data to JSON for API development
Converting CSV exports from databases to structured JSON
Preparing test data from CSV files for frontend development
CSV headers become JSON keys. Make sure header names are unique and valid — spaces and special characters in headers become JSON keys as-is.
Fields containing commas, newlines, or quotes must be enclosed in double quotes. The tool handles standard CSV quoting rules automatically.
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