CSV to JSON Converter

Convert CSV text into a JSON array in the browser. The first row is treated as the header for a predictable output structure.

Private browser-side processing
Input CSVCSV
The first row is used as the header. Missing headers are treated as an error.
3 lines · 72 bytes
Output JSONJSON
No action has been run yet.
0 lines · 0 bytes

About the CSV to JSON converter

Built for spreadsheet exports and database dumps

Paste the CSV that Excel, Google Sheets, or a database export gives you and get a JSON array you can drop straight into an API request or a config file — useful when a tool accepts JSON but the data you have started life in a spreadsheet.

The header row becomes the keys

A first row of id,name,email turns into {"id":"1","name":"Mika","email":"mika@example.com"} for every following row. A CSV without a header is treated as an error rather than guessing field names, because guessing makes the key set unpredictable across rows.

Related converters

JSON Formatter
Free JSON pretty printer with readable syntax error messages.
YAML to JSON
Convert YAML into JSON in the browser. Useful for config files, automation definitions, and quick data inspection.
JSON to YAML
Convert JSON to YAML in your browser. 100% client-side, no upload, no signup. Preserves key order, surfaces row-level parse errors. Supports OpenAPI and Kubernetes config formats.
JSON to CSV
Convert a JSON array or object into CSV in the browser. Nested objects are flattened into dot-notation columns (address.city) so API responses paste cleanly into a spreadsheet.
JSON to Markdown
Convert JSON arrays into GitHub Flavored Markdown tables directly in the browser. Ideal for READMEs, issues, and docs.
CSV to Markdown
Convert CSV into a GitHub Flavored Markdown table directly in the browser. Ideal for READMEs, issues, and docs.
Markdown to CSV
Free tool to convert a Markdown table into CSV. Pipe characters escaped in cells, with a backslash or as a numeric character reference, are restored to a literal pipe, and alignment syntax is not emitted as a data row.
Markdown to HTML
Convert Markdown into HTML in the browser. Supports GitHub Flavored Markdown including tables and task lists.
HTML to Markdown
Convert HTML into clean Markdown in the browser. Useful for migrating content from CMSes, web pages, or HTML emails.

Related articles

YAML vs Markdown vs JSON vs CSV: Data Format ComparisonCompare YAML vs Markdown, JSON, and CSV in one page: decision matrix, feature comparison, comment support, parser ecosystem, LLM context guidance, and the same data shown in all four formats.CSV File Format: Structure, Quoting, BOM and Encoding (2026)A practical guide to the CSV file format: document structure, the header row, RFC 4180 quoting, delimiters, UTF-8 BOM vs Shift-JIS and Windows-1252, Excel auto-formatting traps, and reading CSV with Python pandas.Convert CSV to JSON — Browser, Python, Node, Go, Miller (No Upload)Convert CSV to JSON in your browser without uploading data, or with Python, Node.js, Go, Miller, and csvkit. Covers 5 output shapes (NDJSON, nested, keyed), type inference, Shift-JIS/UTF-8 encoding, and large-file streaming.