ConverterJSON to Excel Converter
Create an XLSX workbook from a predictable JSON table. Paste JSON or upload a .json file, validate the root array, inspect the resulting columns, and download one editable worksheet without executing the input.
Convert Your File
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Data preview
Supported Input
A .json file or pasted JSON array up to 5 MiB.
Generated Output
One editable .xlsx workbook containing one worksheet.
Declared Conversion Profile
| Profile decision | Current behavior |
|---|---|
| JSON root | One array of objects or one array of arrays; mixed root row shapes and duplicate object keys are rejected. |
| Numeric precision | Safe short numeric lexemes become numbers. Unsafe integers, long decimals, extreme exponents, and negative zero are preserved as text with a warning. |
| Nested values | Nested arrays and objects become compact JSON text in one cell instead of being flattened. |
| Formula safety | Every JSON string remains a text cell, including strings beginning with =, +, -, or @. |
What This Conversion Preserves
- JSON strings, booleans, null positions, and Unicode text.
- Safe short numbers as numeric cells and unsafe numeric lexemes as text.
- First-seen key order for objects and row order for arrays.
Important Format Limits
- The root value must be an array of objects or an array of arrays, with no duplicate object keys.
- Nested objects and arrays are stored as compact JSON text in one cell.
- Formula-like strings remain text and are not turned into executable spreadsheet formulas.
Preview tables show at most the first 100 rows and 50 columns. The downloaded result contains all validated data unless a documented hard limit stops conversion before export.
A Practical Example
Objects with different keys become one union of columns in first-seen order. A missing property becomes an empty cell, while a nested address object is stored as compact JSON text instead of being flattened unpredictably.
Before You Download
- Confirm the JSON root is an array of objects or arrays before generating a workbook.
- Review nested values, inconsistent keys, nulls, missing properties, and numeric lexemes preserved as text.
- Check that formula-like strings remain literal text and that spreadsheet readability is acceptable.
Browser Processing and File Safety
Conversion runs locally in a Web Worker. Converter247 does not send pasted CSV or JSON data, selected source files, or generated XLSX output to a conversion API. Data remains in the current page session until reset or navigation.
Imported text is treated as data. Formula-like strings are written as text, dates are not guessed, and leading-zero identifiers remain text under the default profile. JSON numeric lexemes that cannot be safely represented as JavaScript numbers are preserved as text with a visible warning.
The generated file is a one-worksheet .xlsx workbook. It does not recreate formulas, styles, charts, macros, or workbook features that are absent from the CSV or JSON source.
Related Guides
Use these references when the format choice, preservation limits, or document handoff matters as much as the immediate conversion.
Frequently Asked Questions
Use an array of objects or an array of arrays. A root object by itself is rejected with a clear message.
Nested arrays and objects are serialized as compact JSON text in the corresponding cell. They are not flattened automatically.
The tool creates a union of all discovered keys and leaves a blank cell where an object does not contain one of those keys.
No. User-provided strings are written as text cells, including values that begin with formula-like characters.
The original JSON numeric lexeme is written as text and a warning identifies that precision-preserving fallback.
Yes. It is a standard XLSX workbook with one worksheet and can be edited in compatible spreadsheet software.
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