CSV to JSON. Instantly.
Turn spreadsheet exports and CSV files into clean, structured JSON — without uploading a thing.
How to use CSV to JSON
Paste or upload your CSV
Paste CSV text or open one or more .csv files exported from Excel, Google Sheets or a database client. Everything stays on your machine.
Headers become JSON keys
The first row is read as the header row and each column name becomes a property on every record. Switch to the Table view first if you want to sanity-check how the columns were detected.
Copy or download the JSON
Get back a formatted array of objects you can paste straight into a test fixture, a seed script or an API request body.
Why use Parsefy CSV to JSON?
Your data never leaves your device
Everything runs in your browser tab — there is no upload step and no server to store anything. That makes it safe for API responses, database dumps and production data you could not paste into a hosted converter.
Types are detected for you
Numbers and booleans come through as real JSON numbers and booleans instead of quoted strings, so the output is usable as a fixture without hand-editing.
Rebuilds nested structures
Dot-notation headers such as user.address.city are expanded back into nested JSON objects, which makes a round trip from JSON to CSV and back lossless.
No sign-up, no file-size tier
There is no account, no email wall and no paid plan gating bigger files. The only real limit is how much memory your own browser can spare.
CSV to JSON — frequently asked questions
How are CSV headers converted to JSON keys?
The first row of your CSV is treated as the header row, and each column name becomes a property key on every object in the output array. Header names are used exactly as written, so a column called First Name produces a "First Name" key — rename the column before converting if you need camelCase or snake_case keys.
How is nested data handled?
Headers written in dot notation are expanded back into nested objects. A column named user.address.city becomes {"user":{"address":{"city":"…"}}} rather than a flat key with dots in the name. This mirrors how the JSON to CSV tool flattens data, so converting in both directions round-trips cleanly.
Are numbers and booleans converted automatically?
Yes. Values that look like numbers or true/false are emitted as real JSON numbers and booleans instead of strings. Note that this also means a value like 007 becomes 7 — if you need to preserve leading zeros in IDs or postcodes, quote them in the source CSV.
What happens to empty cells and duplicate headers?
Empty cells become empty strings so every record keeps the same shape, and completely blank lines are skipped. If two columns share the same header name, the later column wins, because a JSON object cannot hold the same key twice.
Is my CSV uploaded anywhere?
No. Parsing happens locally in your browser using a client-side CSV parser, so customer exports, financial data and other sensitive spreadsheets never leave your device.