Merge JSON Files

Merge multiple JSON inputs with a chosen strategy (deep merge, concat arrays, or overwrite).

Fast processing • Browser-based • Easy copy and download

Workspace

Paste data, upload a file, and produce clean output instantly.

Merge strategy

Paste multiple JSON values separated by ---.

Input

Output

Processed Locally

Your file never leaves your device. Everything is processed in your browser — we never see or store your data.

Frequently Asked Questions

JSON Formatter

Beautify JSON with stable indentation and optional key sorting.

JSON Pretty Print + Sort Keys

Pretty-print JSON and optionally sort keys recursively for stable output.