Zero Dependencies ✓ No Uploads

Merge multiple JSON files
right in your browser.

Drop your files, preview the merged result, and download. Everything runs client-side with no server uploads or external dependencies.

Drop JSON files here

or browse to select

Supports .json, .jsonl — order matters (top = lowest priority)

Report an issue

This opens a prefilled GitHub issue. Nothing is sent anywhere until you press "Open on GitHub" and then "Submit issue" there — and your file contents stay out of the report unless you tick a file below.

Diagnostics included automatically 

    

    

      Attach file contents · full text; GitHub link caps at 3 KB each, "Copy as text" keeps it whole
      

      
No files loaded — load the problem files first if you want to attach a snippet.

    

    
🔒 Metadata only by default: names, sizes, parse errors, settings, browser info.

    ⚠️ Attaching a file posts its full contents to a public issue — redact secrets (keys, tokens) first.