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Structured Data Converter

Use SheetJS to parse JSON, CSV and Excel XLSX locally, preview the table, then download the format you need without sending data to the cloud.

Back to Converter HubSheetJS CDN library

Import, preview and export

Supports JSON arrays / objects, CSV and XLSX / XLS.

Table preview

The first 40 rows appear after you choose a data file.

Parse and export progress0%

Choose a JSON, CSV or Excel file to begin.

Output summary




    

        Features and usage guide
        
What is this tool for?

        
Use SheetJS in the browser to parse JSON, CSV and XLSX / XLS files, preview tables and export several formats.

    

    

        

            
 3-step quick guide

            
  1. 1
    Drop a JSON, CSV or Excel file into the page.
  2. 2
    Review the table preview and choose an output format.
  3. 3
    Export and download; the complete dataset is generated locally.

        

        

            
 Privacy statement

            
Table content is parsed, previewed and exported in the browser without an upload service.

            
There is no file-upload endpoint; practical speed depends on device performance and browser support.

        

    

    

        
 Frequently asked questions

        
Can I process a large spreadsheet?
The preview limits rows and columns to keep the interface responsive, while export uses the parsed dataset. Practical limits depend on device memory.
Does SheetJS upload my data?
No. SheetJS parses the file in the current page JavaScript environment.
Can I export several files at once?
This page focuses on one data file at a time; use Excel to PDF or a batch tool for multi-file workflows.