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CSV to JSON Converter

Convert CSV exports into JSON arrays with delimiter detection, header controls, and private in-browser parsing.

Input

Paste raw CSV from Excel, Google Sheets, crawlers, or your data warehouse.

Drop a .csv or click to browse

Auto-fill the editor with spreadsheet exports without copy/paste.

Processed locally — files never leave your browser.

Drag & drop or click to import a .csv—everything stays in your browser.

Auto-detect or force the separator used in your export.

Disable when the first row is data so the tool generates generic column names.

Turn off if IDs with leading zeros (ZIP codes, SKUs) must stay strings.

What is the CSV to JSON Converter?

A browser-based data prep utility that transforms spreadsheet-style CSV exports into well-formed JSON arrays ready for APIs, data warehouses, and SEO ops without installing CLI tools.

Key Features

Auto delimiter detection with robust quote handling to keep complex rows intact.
Header normalization with duplicate-safe column names and row-length validation.
Optional whitespace trimming and type casting for numbers, booleans, and null values.
Private, in-browser processing with instant JSON preview and copy helpers.

How to Use

1

Paste your CSV export—such as a domain list with status codes—into the input area or load the provided sample data.

2

Select the delimiter (comma, semicolon, tab, or pipe) or keep Auto-detect so marketing exports parse correctly.

3

Decide whether the first row contains headers, toggle trimming or type casting, and ensure domain columns keep their intended format.

4

Run the tool, review the status and schema preview, then copy the JSON output into Postman, webhooks, or documentation.

Common Mistakes to Avoid

Pasting CSV that mixes commas and tabs in the same file—pick a single delimiter or clean the export before converting.
Forgetting to mark the header row so domain names become column_1, which makes downstream JSON harder to read.
Leaving smart quotes or merged cells from spreadsheets, which can break RFC-compliant parsing; export as plain CSV first.

Examples

Convert a Screaming Frog domain crawl (domain, status, canonical) into JSON for an API smoke test.
Reshape a CRM contact CSV into JSON before importing to a SaaS integration or Zapier workflow.
Transform a pricing table or SKU feed into JSON for static site generators and configuration files.

FAQ

What file size can this converter handle?

Most browsers comfortably process a few thousand rows (around 1–2 MB of CSV). For larger datasets, split the export into smaller batches before pasting to avoid memory spikes.

Do you upload my CSV anywhere?

No. Parsing happens locally so domain inventories, contact lists, and revenue exports never leave your device.

How are commas or line breaks inside quotes handled?

We follow RFC 4180 quoting, so wrapping a value in double quotes preserves embedded commas, pipes, or newlines.

Can I convert TSV or pipe-separated files?

Yes—choose Tab, Pipe, Semicolon, or keep Auto-detect so the converter matches the delimiter used by your export.

What does the type casting toggle do?

When enabled we convert 42, 3.14, true, false, or null into native JSON types; disable it if padded IDs such as ZIP codes must remain strings.

How do I keep only a handful of columns?

Remove unwanted columns in your spreadsheet before pasting or trim keys from the JSON output before sending it to an API.

Related Tools

JSON to CSV Converter