Changelog

What's shipped, most recent first. We update this by hand, in order, and don't back-date entries.

• September 28, 2026

  Excel files built in your browser, and much bigger files

  Download Excel now builds the .xlsx file right in your browser, so your data never leaves your device and the old 4 MB Excel limit is gone. Files up to 200 MB open on a computer (50 MB on phones), and tables past Excel's 1,048,576-row limit continue on extra sheets. The preview also gained more rows on demand, pinned headers, full cell values, column summaries, and a Columns panel to hide or rename columns.

• September 26, 2026

  JSON viewer

  The formatter is now a JSON viewer too: paste or drop JSON to explore it as a collapsible tree, search keys and values, and copy the path to any value. Invalid JSON now shows exactly where it breaks, with a button that jumps to the spot, and Open in the Excel converter takes the same JSON straight to a spreadsheet.

• September 25, 2026

  Nested lists as rows

  Lists inside your records, like orders or line items, can now become one row per item instead of numbered columns, in both the Excel and Google Sheets converters. See both layouts on the new nested JSON to Excel page.

• September 25, 2026

  JSON to Google Sheets

  A new JSON to Google Sheets tool: paste or upload JSON, copy a sheet-ready table, and paste it into cell A1, all in your browser. It also includes a free IMPORTJSON Apps Script function for pulling a JSON URL into a sheet.

• July 28, 2026

  Free tier lowered to 10 requests/month

  The Free API tier's quota dropped from 500 to 10 requests/month: enough to evaluate the API, not to run it in production. Pro (20,000/month) is unchanged.

• July 27, 2026

  Sign in and account dashboard

  Returning users can sign in with a passwordless email link to see their API key, usage against their plan, and manage or cancel billing — no password to remember or lose.

• July 26, 2026

  Developer API launched

  A rate-limited, authenticated /v1/convert endpoint with Free (500 requests/month) and Pro (20,000/month) tiers, self-serve API keys, and Stripe billing for upgrades.

• July 24, 2026

  Site navigation, and safer downloads

  Added a persistent top navigation bar site-wide. Excel files now only download after an explicit click — never automatically the instant a file is uploaded.

• July 22, 2026

  Contact page and expanded guide library

  Added a direct contact page, and grew the blog with additional JSON/CSV/Excel reference guides.

• July 21, 2026

  Paste JSON is now the default

  Swapped the default input tab from Upload File to Paste JSON, since most visitors arrive with JSON already in hand.

• July 18, 2026

  Sortable preview table

  The data preview shown before converting is now a real sortable table — click any column header to sort ascending or descending.

• July 16, 2026

  CSV support, dark mode, and rate limiting

  Added CSV as a second input format alongside JSON, automatic dark mode based on system preference, a request-size guard, and API-level rate limiting to keep the service reliable.

• July 16, 2026

  Full redesign and blog launch

  Redesigned the entire site on a new visual system, added SEO metadata and structured data across every page, and launched the blog.

• July 15, 2026

  Backlink credit in every export

  Every generated Excel file now includes a discreet, italic credit line crediting jsonsupport.com — visible in the spreadsheet, not just the download.

• July 14, 2026

  JSON Support launches

  Free, no-signup JSON-to-Excel conversion in the browser.