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CSV to JSON Converter Online

Turn delimited rows into clean JSON while staying in control of headers, delimiters and value types. Preview the parsed table and resolve irregular rows before exporting.

Read the full guide

Direct answer

A CSV-to-JSON converter maps each delimited row to a JSON object or array. AppKiro can detect common delimiters, use the first row as keys, trim cells, coerce scalar values and report inconsistent column counts.

Load your delimited data, verify the preview and export the JSON shape your application expects.

1

Input CSV

Example data loaded.
#idnameemailrolesignup_dateactive
11Alice Johnson[email protected]Admin2024-01-15true
22Bob Smith[email protected]Editor2024-02-03true
33Carol Williams[email protected]Viewer2024-02-20false
44David Brown[email protected]Editor2024-03-05true
55Eva Davis[email protected]Viewer2024-03-18true
Supports .csv, .tsv, .txt, .xlsx, .xls. Files are processed in your browser.5 rows · 6 columns detected
2

Output JSON

1[2  {3    "id": 1,4    "name": "Alice Johnson",5    "email": "[email protected]",6    "role": "Admin",7    "signup_date": "2024-01-15",8    "active": true9  },10  {11    "id": 2,12    "name": "Bob Smith",13    "email": "[email protected]",14    "role": "Editor",15    "signup_date": "2024-02-03",16    "active": true17  },18  {19    "id": 3,20    "name": "Carol Williams",21    "email": "[email protected]",22    "role": "Viewer",23    "signup_date": "2024-02-20",24    "active": false25  },26  {27    "id": 4,28    "name": "David Brown",29    "email": "[email protected]",30    "role": "Editor",31    "signup_date": "2024-03-05",32    "active": true33  },34  {35    "id": 5,36    "name": "Eva Davis",37    "email": "[email protected]",38    "role": "Viewer",39    "signup_date": "2024-03-18",40    "active": true41  }42]

1. Paste or upload

Add your CSV or Excel data above.

2. Convert instantly

The tool transforms it to JSON in your browser.

3. Copy or download

Use your JSON data wherever you need.

How to use it

  1. Paste text, upload a CSV/TSV or supported spreadsheet, or use the public-URL input.
  2. Confirm the delimiter and header setting, then choose type coercion, trimming and the output shape.
  3. Inspect the table/quality report and copy or download pretty or minified JSON.

Key features and settings

  • Automatic delimiter detection with manual override.
  • Header-row control and object-array or row-array output.
  • Optional conversion of numbers, booleans and null-like values to native JSON types.
  • Preview and quality warnings for irregular row/column structure.

Supported input and output

Input: CSV or TSV text, .csv, .tsv, .txt, .xlsx, .xls, a supported public URL. Output: JSON text or file.

Use cases

  • Prepare CSV exports for APIs or frontend fixtures.
  • Convert TSV copied from a spreadsheet into structured JSON.
  • Diagnose malformed delimiters, missing headers or ragged rows.

Which workflow should you choose?

Use CSV to JSON Converter for: Automatic delimiter detection with manual override. Use Excel to JSON Converter for: Multi-sheet workbook navigation and an all-sheets map output.

Privacy and data path

In the current implementation, pasted/uploaded content is processed in the browser, while “Extract from URL” uses a server-side proxy to fetch the source.

Limits and troubleshooting

  • Quoted delimiters and line breaks inside cells require valid CSV quoting; always check the preview.
  • Disable type coercion for identifiers such as 00123, phone numbers or postal codes that must remain strings.
  • There is no universal size promise; large-input performance depends on browser memory and device capability.

FAQ

Should the first CSV row become JSON keys?

Keep the header option on when row one contains column names. Turn it off when row one is data and you want generated column keys.

Is my data uploaded to a server?

In the current implementation, pasted/uploaded content is processed in the browser, while “Extract from URL” uses a server-side proxy to fetch the source.

What are the file or data limits?

There is no universal size promise; large-input performance depends on browser memory and device capability.

Does it work on mobile?

The page is web-based and may work in a modern mobile browser, but file-picker behavior, memory and cross-device compatibility are not verified for every device. Use a desktop browser for large or complex inputs.

Which workflow should you choose?

Use CSV to JSON Converter for: Automatic delimiter detection with manual override. Use Excel to JSON Converter for: Multi-sheet workbook navigation and an all-sheets map output.

Related tools

Excel to JSON ConverterTurn a workbook and multiple worksheets into structured JSON.JSON to CSV ConverterGenerate CSV from JSON with the appropriate delimiter, quoting and BOM options.JSON Formatter OnlineFormat and validate JSON before conversion, or inspect the result afterward.

Load your delimited data, verify the preview and export the JSON shape your application expects.