JSON to Formatted Excel (.xlsx) Multi-Sheet
JSON to Formatted Excel (.xlsx) Multi-Sheet: Maps root JSON object keys to individual Excel worksheets, formats column headers, and populates typed data rows.
About this json to formatted excel (.xlsx) multi-sheet
JSON to Formatted Excel (.xlsx) Multi-Sheet — browser-based utility.
How this tool works
Converts supported JSON record collections into XLSX worksheets using SheetJS and sanitizes and deduplicates worksheet names. Integer literals outside JavaScript's safe range are preserved as strings, while decimal and exponent literals still use binary64 numbers.
- Delimiter & Encoding Detection: Auto-detects delimiters (comma, tab, semicolon, pipe) and identifies UTF-8, UTF-16, or ISO-8859-1 encodings.
- RFC 4180 Lexical Parsing: Deconstructs fields and records, properly parsing multiline text blocks and escaped quote characters.
- Structural Transformation: Executes column reordering, row-column transposition, or SQL INSERT query generation.
- XLSX Packaging & Cell Typing: Emits clean, formatted Excel files with typed numeric/string cells to prevent formula injection.
Worked example
Scenario: Export two record arrays as separate XLSX sheets.
Sample input:
Processing: Select the two root array properties in property order and pass each to SheetJS json_to_sheet.
Illustrative output:
Limits and verification
Prevents CSV formula injection (CSV Injection / Formula Injection) by prefixing cells starting with '=', '+', '-', or '@' with a single quote when generating spreadsheets. Handles files up to browser memory capacity (~50-100 MB).
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
- RFC 8259 (The JavaScript Object Notation Data Interchange Format)
- ECMA-404 (The JSON Data Interchange Standard)
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Enter, paste, or select your input data into the JSON to Formatted Excel (.xlsx) Multi-Sheet workspace controls.
- Review available parameter fields, units, formats, or options configured for your task.
- Click the action button or observe immediate live calculations rendered in your browser runtime.
- Inspect the resulting output and any diagnostic messages, then copy or download the result if needed.
Frequently asked questions
How does JSON to XLSX choose worksheet rows?+
It UTF-8 decodes one local JSON file. If the root is an object with one or more array-valued properties, each such property becomes one SheetJS worksheet in property order; non-array root properties are omitted in that case. A root object without array properties becomes one Data sheet containing that object, while a root array or scalar becomes rows in Data.
Which controls, file and workbook result are actually available?+
The page has a local file chooser and Process locally. It writes czoa-json.xlsx and reports the number and names of workbook sheets. There is no sheet picker, table selector, header/style editor, CSV option, formula option, cell-type control, output filename field, preview, append mode, or manual download setting.
How are sheet names and JSON numbers bounded?+
Each selected array property is converted with SheetJS json_to_sheet. Its sheet name removes : \ / ? * [ ], trims whitespace, is cut to 31 characters, falls back to Sheet, and receives _2, _3 and so on when needed. Integer literals outside JavaScript safe-integer range are quoted before JSON parsing; decimal and exponent literals may still be converted through binary64, and the tool does not promise original numeric spelling or a lossless nested-data round trip.
What did isolated browser verification establish?+
A local browser run converted independent JSON with Sales and Archive record arrays into czoa-json.xlsx and reported exactly two sheets in that order. The test established XLSX creation and those sheet names, while recorded requests contained no submitted fixture payload; it did not establish formatting, formula safety, spreadsheet compatibility beyond the fixture, or precision for decimals and exponents.