What does the CSV to JSON output look like?

The first row is treated as the header, and each row becomes an object keyed by the header names. The output is an array of objects. You can optionally pretty-print it with 2-space indentation.

What JSON does JSON to CSV accept?

It expects an array of objects (for example, [{"name":"A","age":1}, ...]). It collects the keys from all objects to build the header, then writes the CSV. If the input is not an array of objects, an error is shown.

Can I change the delimiter?

Yes. You can choose comma, tab, semicolon, or pipe. Pick tab to read or write TSV.

Are quotes and special characters handled correctly?

Yes. Parsing and generation use a robust library, so fields containing commas, newlines, or quotes are escaped and interpreted correctly.

No. Everything runs entirely in your browser. Your data is never uploaded or stored on a server.

Yes, it is completely free. No sign-up and no installation required.

CSV ⇄ JSON Converter

CSV tools

Convert CSV to a JSON array of objects and back, choose the delimiter, and pretty-print the JSON. Everything runs in your browser; your data is never uploaded.

What is this CSV ⇄ JSON converter?

A free, browser-based tool that converts both ways: CSV to a JSON array of objects (keyed by the header row), and a JSON array of objects back to CSV. Choose the delimiter (comma, tab, semicolon, pipe) and, for JSON output, whether to pretty-print it. It is handy for turning a spreadsheet export into an API payload, or an API response into a CSV you can open in Excel. Everything runs locally in your browser, so your data is never uploaded.

How to use it

Choose the direction: CSV → JSON or JSON → CSV.
Upload a file or paste your data into the box on the left.
Pick the delimiter, and for CSV → JSON choose pretty or compact output.
Copy the result or download it as output.json / output.csv.

Common use cases

Turning a spreadsheet/CSV export into a JSON payload for an API or import.
Converting a JSON API response into a CSV you can open in Excel.
Reshaping marketing data between tools that speak different formats.

Related CSV tools

FAQ

Operated by

Tools by Timothe AI is a suite of free tools built and operated by unbounded pioneering inc, the company behind Timothe AI.

Ryosuke SuzukiFounder & CEO

Founder & CEO of Unbounded Pioneering Inc., the company behind Timothe AI, and an expert in machine learning and AI product development. He began his career in machine learning research at a university laboratory, then designed and built large-scale products as a software engineer at PLAID, Rakuten, and Recruit, while also driving new business development. Now specializing in generative AI and AI products, he works across both engineering and business development, and is a named inventor on multiple granted patents in web technology.

Named inventor on granted patents JP6887648 & JP7480958 · Patent pending on Timothe AI technology

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