CSV to JSON Converter
CSV Input
Paste CSV data with headers in the first row
Settings
Paste CSV data and click Convert to JSON
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From Two CSV Lines to Two JSON Objects
Take a file with the header id,name,email followed by 1,Ada,ada@example.com and 2,Grace,grace@example.com — the output is an array of two objects: {"id": "1", "name": "Ada", "email": "ada@example.com"} and its sibling. Fields containing commas work fine when properly quoted — 'Smith, John' stays one value — and empty rows are skipped automatically, so no phantom null entries pollute the output.
Strings That Look Like Numbers, and Semicolon Exports
Two realities to plan for. CSV has no types: the id above arrives as the string '1', not the number 1 — if downstream code expects numbers, converting '1' to 1 afterwards is part of the pipeline, not a converter flaw. And European Excel defaults to semicolon delimiters because of decimal commas, so a 'broken' import is often just a semicolon file being parsed as comma-separated. Check the delimiter and the file encoding (Excel's defaults are frequently not UTF-8) before assuming the data is at fault.
About CSV to JSON Converter
The converter's daily job is the boundary between the two most common data formats in existence: an analyst exports a report from Excel or Google Sheets, a developer needs the same rows as JSON for an import script, a mock API, or a no-code tool that only accepts structured data. The first row becomes the field names and every following row becomes an object — which is why a clean header row matters more than anything else in the file.
How to Use
Step 1
Paste your CSV data into the input field
Step 2
Choose delimiter (comma, semicolon, tab, pipe) or use auto-detect
Step 3
Check 'First row is header' if your CSV has column names in the first row
Step 4
Enable 'Trim whitespace' to remove extra spaces from values
Step 5
Preview your CSV structure to verify it's parsed correctly
Step 6
Click 'Convert to JSON' to generate JSON array
Step 7
Copy the JSON output to use in your project
Features & Benefits
- ✅Convert CSV to JSON array format
- ✅Auto-detect delimiter (comma, semicolon, tab, pipe)
- ✅Manual delimiter selection for precise control
- ✅Handle quoted values with commas inside
- ✅Support for escaped quotes within quoted fields
- ✅First row as header option (or auto-generate col1, col2, etc.)
- ✅Trim whitespace from values
- ✅Preview CSV structure before conversion
- ✅Shows detected delimiter, column count, and row count
- ✅Sample data preview (first 3 rows)
- ✅Automatic type conversion (numbers, booleans, null)
- ✅One-click copy to clipboard
- ✅Real-time validation and error messages
- ✅100% browser-based - CSV never sent to server
- ✅100% free - no limits, no signup required
FAQs
What is CSV to JSON conversion?
CSV (Comma-Separated Values) is a simple text format for tabular data. JSON (JavaScript Object Notation) is a structured data format used in web development and APIs. Converting CSV to JSON transforms rows into objects with key-value pairs, making it easy to use in JavaScript applications.
How does auto-detect delimiter work?
Auto-detect analyzes the first line of your CSV to determine which delimiter (comma, semicolon, tab, or pipe) is most common. It counts occurrences of each delimiter and selects the one with the highest count. You can override this by manually selecting a delimiter.
What if my CSV has commas inside values?
The converter properly handles quoted values. If a field contains commas, quotes, or line breaks, wrap it in double quotes. For example: "Smith, John",30,"New York, NY". Escaped quotes (double quotes inside quotes) are also supported: "He said ""Hello""".
Should I check 'First row is header'?
Check this if your CSV's first row contains column names (e.g., name, age, city). These will become JSON object keys. If unchecked, the tool generates default keys (col1, col2, col3, etc.) and treats all rows as data.
What does 'Trim whitespace' do?
This option removes leading and trailing spaces from all values. For example, " John " becomes "John". This is useful for cleaning up CSV data that has inconsistent spacing.
How are data types handled?
The converter automatically detects and converts data types: numbers become numeric values (not strings), "true"/"false" become booleans, "null" becomes null, and everything else remains a string. This makes the JSON more useful for programming.
What delimiters are supported?
We support 4 common delimiters: Comma (,) - most common, Semicolon (;) - common in Europe, Tab (\t) - used in TSV files, and Pipe (|) - used in some database exports. Auto-detect works for all of them.
Can I convert JSON back to CSV?
Yes! Use our JSON Formatter tool and click 'Convert to CSV' to convert JSON arrays back to CSV format. This works for JSON arrays of objects where each object has the same keys.
What if my CSV has empty rows?
Empty rows (rows with no data or only whitespace) are automatically skipped during conversion. This prevents empty objects in your JSON output.
Is my CSV data secure?
Yes! All CSV processing happens entirely in your browser using JavaScript. Your CSV data never leaves your device and is not sent to any server, ensuring complete privacy and security.