CSV ⇄ JSON Converter
Go from CSV to JSON or back again with a single click. Paste data or drop a file to get a formatted JSON array or an Excel-ready CSV straight away, with nothing uploaded.
Converted on your device. Your data never leaves your browser.
Converting between CSV and JSON
Spreadsheet exports become a formatted JSON array of objects, and JSON arrays become CSV, as quickly as you can paste. Pick the direction with one click and your data converts the moment it's entered. For CSV input, the separator (comma, semicolon, tab or pipe) is detected automatically, quoted fields and line breaks inside cells are handled properly, and numbers and booleans can be typed rather than left as strings. For JSON input, nested objects are flattened into dotted column names so every value gets its own column, and the CSV opens cleanly in Excel, Google Sheets and Numbers. Parsing happens in your browser, so customer lists, exports and API responses are never uploaded – and there are no row limits or sign-ups.
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Choose CSV → JSON or JSON → CSV with the toggle above.
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Paste your data or drop a .csv, .tsv or .json file – the conversion appears instantly.
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Adjust options such as the separator or number detection, then copy or download the result.
What makes this CSV ⇄ JSON converter handy
Both directions
CSV to JSON and JSON to CSV in one place, switched with a click.
Smart parsing
Separators are detected for you, and quoted fields with commas or line breaks just work.
Nested JSON
Objects are flattened into dotted columns, so nothing is lost in the CSV.
Private
Data is converted on your device and never sent to a server.
What people use the CSV ⇄ JSON converter for
Load data into databases and APIs
Turn a spreadsheet export into JSON for MongoDB, Firebase or a REST API.
Look at API data in Excel
Convert JSON responses into CSV to analyse in Excel or Google Sheets.
Create mock data
Build JSON fixtures for front-end work from a quick CSV.
Move data between apps
Switch formats when importing into CRMs, CMSs and no-code tools.
Also searched for as: CSV JSON converter, CSV to JSON array, JSON to Excel, spreadsheet to JSON and JSON to spreadsheet.
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Quick data conversions in the browser
Switch between CSV, JSON and YAML, or turn images into Base64, without installing anything. Everything is processed in your browser, so exports, customer data and API keys stay on your machine rather than going to someone else's server.
Questions & answers
How do I turn CSV into a JSON array?
Choose CSV → JSON, then paste your CSV or drop the file. The first row supplies the keys and each later row becomes an object in a formatted JSON array you can copy or download.
Is my data uploaded during conversion?
No. Both directions run entirely in your browser, so your CSV and JSON stay on your device. It's fine for confidential exports and has no size limit beyond your device's memory.