Turn CSV into clean JSON
Paste CSV, drop a CSV or Excel file or open a URL. CsvNex detects the delimiter, reports broken quotes with line and column, and converts every row to JSON with the header, type and nesting rules you choose – then back to CSV, Excel, XML or YAML.
Convert CSV to JSON now — no sign-in needed
Paste or drop CSV, tune the conversion, keep up to 20 documents in this browser and share a read-only link with anyone.
From CSV to exactly the JSON you need
Built for developers and integrators who work with SOAP services, RSS feeds, configs, sitemaps and legacy exports every day.
Conversion you control
Auto or fixed delimiter, header row on or off, numbers and booleans as real JSON types, "user.name" headers as nested objects, and output as objects, arrays, columns or keyed by the first column.
CSV ⇄ JSON sync
Click a row in the Grid and the CSV editor jumps to that line – move the cursor in the CSV and the grid follows to the cell.
CSV validator
Unclosed quotes and text after a closing quote are reported with line and column; rows with the wrong number of fields are listed as warnings you can click.
Thai & Excel friendly
UTF-8 everywhere, an optional BOM so Excel shows Thai and accented text correctly, and real .xlsx export and import.
Cloud library
Folders, tags, full-text search of cell values, version history and a 30-day trash.
Both directions
CSV → JSON and JSON → CSV with the same rules, clean / change delimiter, remove duplicate rows, and export to TSV, Excel, XML and YAML.
Private by design
Tools run in your browser. Keycloak sign-in, encrypted storage and PDPA export or erasure any time.
Three steps to clarity
Paste or open
Paste CSV, drop a .csv / .tsv / .xlsx file or open a URL.
Tune & check
Pick conversion options, validate, explore the JSON as grid, tree or text and query it with JSONPath.
Export & share
Download JSON, CSV, TSV, Excel, XML or YAML, save to your Library or send a read-only link.
Rent CsvNex monthly or yearly
Start free. Upgrade when you need more space and bigger files. Cancel any time.
Prices in Thai baht including 7% VAT. Tax invoices are issued automatically.
Frequently asked questions
Do I need an account?
No. The converter, formatter and validator run entirely in your browser. Sign in to keep files in your cloud Library, history and versions.
How does billing work?
Choose a plan and pay monthly or yearly by PromptPay or card. Yearly plans cost 10 months. You get a tax invoice for every payment and can cancel any time — the plan stays active until the end of the period.
Can I change or cancel my plan?
Upgrades apply immediately with a prorated credit. Downgrades and cancellations take effect at the end of your current billing period.
Who can see a shared link?
Anyone with the link can read the CSV and its JSON in grid, tree or text view – nobody can edit it. You can stop sharing at any time.
Which devices are supported?
All modern browsers on desktop, tablet and phone (installable as a PWA). Native iOS and Android apps are coming soon and sync with the same account.
Stop hand-converting spreadsheets
Get clean JSON in seconds. Upgrade when you are ready.
Try it now – free