CSV to JSON Converter

How CSV to JSON Conversion Works

Toolkiya parses CSV input following RFC 4180: fields are split on the chosen delimiter, quoted fields can contain commas and newlines, and doubled double-quotes are unescaped to a single quote. The first row is treated as the header by default, and each subsequent row becomes an object keyed by those headers.

Values are kept as strings unless you enable type inference, in which case numbers, booleans, and null are coerced where it is unambiguous. Empty fields become empty strings or null depending on the option. The entire parse runs in your browser using a streaming tokenizer that handles large files without blocking the UI, and the resulting JSON is rendered with configurable indentation before download.

When to Convert CSV to JSON

Feeding spreadsheet data into a REST API that only accepts JSON. Importing a CSV export into a JavaScript app for client-side rendering. Preparing test fixtures from a CSV produced by a non-technical teammate. Migrating data out of legacy tools that export CSV into modern systems that speak JSON. Quickly inspecting CSV structure as JSON for debugging.

Why Convert CSV in Toolkiya

Spreadsheets often hold customer lists, financials, or internal datasets you would not want sitting on someone else's server. Toolkiya parses your CSV entirely client-side using a streaming tokenizer that never touches the network.

There is no row cap, no upload limit, no signup, and no daily quota. The output is plain JSON with no injected metadata or tracking fields, so you can pipe it directly into your code or paste it into another tool.

Tips for Accurate CSV Parsing

If your file uses semicolons or tabs as separators (common with European Excel exports), switch the delimiter before parsing. Watch out for fields that look numeric but should stay as strings — phone numbers and ZIP codes with leading zeros lose data under type inference. Strip the UTF-8 BOM from the source if your JSON keys end up with an invisible character at the start.