Timestamp Converter
Convert between Unix timestamps and dates.
CSV to JSON Converter
Convert CSV data to JSON format instantly with custom delimiters and preview.
Delimiter
CSV Input
JSON Output
What is CSV to JSON Conversion?
CSV (Comma-Separated Values) is a simple text format for tabular data. Converting CSV to JSON transforms each row into a JSON object, using the header row as property names. This is essential for importing spreadsheet data into web applications, APIs, and databases.
How to Use This Tool
- Paste CSV data or drag-and-drop a .csv file
- Select the correct delimiter if your data uses tabs, semicolons, or pipes
- Preview the first 5 rows in the table to verify correct parsing
- Click Convert to generate JSON output
Common Use Cases
- Importing Excel/spreadsheet exports into web applications
- Preparing data for REST API POST requests
- Converting database exports to JSON for frontend consumption
- Transforming CSV logs into structured JSON for analysis
Tips and Common Mistakes
- Ensure your CSV has a header row — it is used as JSON property names
- Fields with commas must be enclosed in double quotes
- Use the delimiter selector for TSV files or European-style CSVs with semicolons
- Empty cells become empty strings in the JSON output
FAQs
How does the converter handle quoted fields with commas?
Fields containing commas, quotes, or newlines should be enclosed in double quotes per the CSV standard (RFC 4180). This tool correctly parses quoted fields, including escaped double quotes ("").
Can I use a delimiter other than comma?
Yes. Use the delimiter dropdown to choose tab, semicolon, or pipe as the separator. This is useful for TSV files or European-style CSVs that use semicolons.
How does header detection work?
The first row of the CSV is treated as the header row. Each subsequent row is converted to a JSON object using the header values as keys. If your data has no headers, add a header row before converting.
What character encoding does this tool support?
This tool works with UTF-8 text. If you have a CSV file in a different encoding (e.g. Latin-1), convert it to UTF-8 first. Most modern editors and operating systems default to UTF-8.
Can I convert CSV with nested or hierarchical data?
Standard CSV is flat. If your CSV has dot-notation columns like "address.city", the result will be flat JSON objects. For nested JSON output, you would need to post-process the converted data.
Is Free CSV to JSON Converter Online — Custom Delimiters & Preview free to use?
Free CSV to JSON Converter Online — Custom Delimiters & Preview is completely free and runs in your browser.
Does Free CSV to JSON Converter Online — Custom Delimiters & Preview send my data to a server?
No. Free CSV to JSON Converter Online — Custom Delimiters & Preview processes input directly in your browser.
Do I need to create an account to use Free CSV to JSON Converter Online — Custom Delimiters & Preview?
No account is required to use Free CSV to JSON Converter Online — Custom Delimiters & Preview.
Privacy-first by design
Tool inputs are processed in your browser. Review the Privacy Policy and Terms for full details.
Related Tools
All ToolsOpen Tool →
JSON to CSV
Convert JSON arrays into downloadable CSV format.
YAML ↔ JSON
Convert between YAML and JSON without leaving the browser.
Case Converter
Convert text between different cases instantly.