CSV to JSON Converter - Free Online Tool

A CSV to JSON converter turns a CSV table into a JSON array of objects. This is useful when you want to feed spreadsheet data into an app, an API, or a script without manually mapping columns by hand. Conversion runs locally in your browser, so your CSV is not uploaded for processing.

1. Paste CSV: Add your CSV content into the input box.
2. Choose delimiter and headers: Auto-detect the delimiter (or select one) and choose whether the first row is a header row.
3. Copy JSON: Copy the output JSON array for your code, API payload, or data file.

• Faster data prep: Turn spreadsheets into JSON without custom scripts.
• Best-effort delimiter detection: Handles commas, semicolons, tabs, and pipes.
• Private conversion: Parsing happens on your device in the browser.

CSV is simple, but small details change the output:

• Delimiter auto-detect: Auto-detect is best effort. If your CSV uses semicolons or tabs, selecting the delimiter manually is the fastest fix.
• Header row: When the first row is a header, values become object keys. If your CSV has no headers, turn that off and the tool will generate keys like col_1, col_2, and so on.
• Types: CSV has no real types. This tool outputs values as strings, so "92" stays "92". Convert types in your code if you need numbers or booleans.

Use case 1: Convert spreadsheet exports into API payloads

Export a table from Sheets or Excel, convert it to JSON, then paste it into a request body for testing.

Use case 2: Create sample data for prototypes

Quickly turn a small CSV into structured JSON you can import into a dev environment or mock service.

Use case 3: Clean up before analysis

Convert CSV to JSON, then format or diff it to spot changes between exports.

Basic example (header row)

Input (CSV):

name,email,plan
Asha Patel,asha@example.com,Pro
Luis Gomez,luis@example.com,Starter

Output (JSON):

[
  { "name": "Asha Patel", "email": "asha@example.com", "plan": "Pro" },
  { "name": "Luis Gomez", "email": "luis@example.com", "plan": "Starter" }
]

Advanced example (semicolon delimiter and quoted fields)

Input (CSV):

"full name";"notes";"score"
"Asha Patel";"Met at ""SaaS Summit"", follow up";"92"

Settings: Delimiter: Semicolon; First row is header: On
Output (JSON):

[
  {
    "full name": "Asha Patel",
    "notes": "Met at \"SaaS Summit\", follow up",
    "score": "92"
  }
]

Wrong delimiter means "everything is in one column"

If the output objects have a single key with the entire row inside it, your delimiter is wrong. Switch delimiter from Auto-detect to the correct one (comma, semicolon, tab, or pipe).

CSV with embedded newlines inside quotes

This tool supports common quoted fields on a single line. If your CSV contains newlines inside quoted cells, pre-clean the file or export it again without multiline cells.

Empty or duplicate header names

If the header row contains empty column names, the converter will generate names like col_1, col_2, and so on. Fix headers in your spreadsheet when you need stable keys.

Numbers do not become numbers

CSV is plain text. If your JSON output needs numeric types, parse them after conversion (for example, convert "92" to 92 in your script).

• Clean before converting: Trim and normalize fields using the CSV cleaner & validator when your input is inconsistent.
• Format the JSON for readability: Use the JSON formatter after conversion when you plan to edit or review the output.
• Convert back when needed: If you need CSV again, use the JSON to CSV converter after you finish edits.

• Convert the other direction with the JSON to CSV converter.
• Validate and clean CSV before importing with the CSV cleaner & validator.
• Compare two exports with the text diff tool.

CSV to JSON conversion runs locally in your browser. Your CSV is not uploaded to a server. If the data is sensitive, clear the input after copying the JSON.