JSON Merge
Deep merge two JSON documents privately in your browser. The right-hand value wins on conflicts.
Deep merge two JSON documents privately in your browser. The right-hand value wins on conflicts.
JSON Merge combines two JSON documents into one result directly in your browser. Objects are merged recursively, so settings from both inputs can be kept while a conflicting value from the right-hand document takes precedence. Arrays and primitive values are treated as complete values and are replaced by the right-hand input.
This JSON merge tool is useful for combining configuration files, API payloads, environment overrides, and test fixtures. Paste valid JSON in both panels, run the merge, and copy the formatted result. Processing stays local to the page, so your JSON is not uploaded or sent to a server.
For predictable results, use valid JSON and check the merged document after combining inputs. This tool changes data according to clear recursive rules and is intended for development workflows, configuration work, data preparation, and quick comparison of two payload versions.
When working with sensitive payloads, keep a local backup before transforming them and compare the output with the source. The result is designed to be readable and copyable, making it suitable for debugging, local experiments, and repeatable developer workflows.