JSON to CSV Converter - Local Spreadsheet Export

Convert JSON objects or arrays to CSV locally in your browser. Flatten fields, preview the result, then copy or download CSV without uploading data.

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How to Use

  1. Paste a JSON object or array of objects into the input panel.
  2. Choose delimiter and header options.
  3. Convert the JSON and review the CSV preview.
  4. If the JSON is not tabular, check the error message.
  5. Copy the output or download a CSV file.

Core Features

  • JSON to CSV conversion: Turn JSON objects or arrays of objects into copyable, downloadable CSV.
  • Nested field flattening: Turn nested objects into dotted column names such as user.email.
  • Header and delimiter controls: Include headers and switch between comma, semicolon, or tab separators.
  • Copy or download: Preview CSV, copy it, or download a .csv file for the next step.
  • Local data workflow: API responses, logs, and business data are converted in your browser without uploads.

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Calculation Logic

CSV is tabular, so JSON must be mapped into rows and columns:

  • Arrays of objects become multiple rows, and object keys become headers.
  • Nested objects are flattened into dotted fields such as profile.name.
  • Missing fields become empty cells.
  • Values containing commas, quotes, or line breaks are quoted and escaped according to CSV rules.

FAQ

Is my JSON uploaded?

No. Conversion runs locally in your browser, and JSON content is not uploaded to a server.

What JSON shapes work best?

Arrays of objects work best, such as [{ "id": 1 }, { "id": 2 }]. A single object converts into one row.

Can this handle nested JSON?

Nested objects are flattened into dotted column names. Arrays are joined into a single cell with semicolons.

Can I download a CSV file?

Yes. You can copy the CSV output or download it as a .csv file.

Does the output work in Excel?

The tool outputs standard CSV. Excel and Google Sheets can usually open it, but regional delimiter settings may vary.

Which delimiter should I use?

Comma is common in English-language workflows. If your spreadsheet app uses regional settings, try semicolon or tab.