What is the difference between deep merge and shallow merge?

A shallow merge replaces a full object branch when the same top-level key appears in both documents. A deep merge recursively combines nested objects so only conflicting leaf values are replaced while unrelated nested keys are preserved.

How does array merging work in the YAML merger?

You can choose to replace arrays or concatenate them. Replace means the incoming array wins when both documents contain the same array key. Concat means the incoming array items are appended to the base array.

What does left-wins or right-wins precedence mean?

Precedence determines which document wins when both documents define the same scalar value or branch. Right-wins means the incoming YAML overrides the base YAML. Left-wins means the base YAML keeps its values where conflicts exist.

Can I use this to merge environment config files?

Yes. That is one of the most common uses. A base config can live on the left, while environment-specific values such as ports, flags, logging, or service overrides can live on the right.

Is the YAML merger private?

Yes. The tool runs locally in your browser, so both input documents and the merged result stay on your device.

YAML Merger

Merge two YAML documents with configurable precedence, deep or shallow object merging, and array replace or concat behavior. Perfect for environment overrides, config composition, and deployment workflows.

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Complete Guide: YAML Merger

Everything you need to know about using YAML Merger effectively

YAML Merger

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Complete Guide: YAML Merger