CSV to JSON Converter
Convert CSV files to JSON format instantly
CSV Input
JSON Output
What Is CSV to JSON?
CSV (Comma-Separated Values) is a flat format: rows and columns. JSON is nested. Converting CSV to JSON means turning each row into an object, with the header row defining the keys. The first row is the header; subsequent rows become objects. This is the inverse of JSON to CSV.
This tool runs in your browser. Paste CSV or upload a file. Nothing is sent to a server. The conversion follows RFC 4180 for CSV parsing.
CSV to JSON Examples
Convert CSV rows to JSON objects. Telecom-themed example:
Example: Subscriber records
JSON output:
Click the Sample button above to load more examples into the editor.
How to Use This Tool
Paste or Upload CSV
Paste CSV into the left editor or upload a .csv or .txt file. Use Sample for example data. The first row should be the header.
View JSON Output
The right panel shows a JSON array. Each row (except the header) becomes an object. Column names from the header become keys. Values are strings unless the tool infers types.
Copy or Download
Use Copy or Download to get the JSON. For the reverse conversion, use JSON to CSV. For formatting the JSON, use the JSON Formatter.
How the Conversion Works
Values with commas are wrapped in quotes per the RFC 4180 CSV spec. The parser handles quoted fields and escaped quotes. The first row defines object keys; each subsequent row becomes a JSON object. Delimiter is typically a comma; European data often uses semicolons. Excel exports use the system's list separator. The output is a JSON array of objects—compatible with JSON.parse() and most APIs.
Where CSV to JSON Helps
Web apps and APIs often expect JSON rather than CSV. Converting spreadsheet exports or database dumps here lets you feed data into frontend frameworks, Postman requests, or serverless functions. Data pipelines that ingest CSV can convert to JSON for storage in document databases like MongoDB.
When building config or seed data from spreadsheets, CSV to JSON is faster than manual entry. For the reverse—converting JSON to CSV—use JSON to CSV. For formatting the output, use the JSON Formatter. For validation, use JSON Validator. For other formats, use CSV to XML or CSV to YAML.
Frequently Asked Questions
Are values typed (number, boolean)?
CSV is text. Parsers often treat all values as strings. Some tools infer numbers or booleans. Check the output. You may need to convert types in code.
What if my CSV has no header?
The tool typically uses the first row as headers. If you need different behavior, you might need to add a header row or use a different tool.
Is my data sent anywhere?
No. Conversion runs in your browser.
Can I convert JSON to CSV?
Yes. Use the JSON to CSV tool.
What about CSV with different delimiters?
Standard CSV uses commas. If your file uses semicolons or tabs, the tool may have options. Check the interface. RFC 4180 defines comma-separated format.
Related Tools
For CSV format, see RFC 4180. For JSON, see json.org and MDN's JSON guide. RFC 8259 is the formal JSON standard.