YAML Merger
Merge multiple YAML documents with configurable conflict and array strategies.
YAML Merger
Merge multiple YAML documents with configurable conflict and array strategies.
About YAML Merger
Merge up to five YAML inputs
The merger parses each YAML input, combines the resulting mappings, and formats the merged output. Inputs are merged in order, which makes it useful for base config plus environment overrides such as Helm values or deployment manifests.
Conflict and array strategies
For keys that appear in more than one document, you can choose whether the later input or the earlier input wins. Arrays can be concatenated or replaced, and nested mappings are merged recursively under the selected strategy.
Review before applying configs
Because YAML often controls deployment behavior, merge results should be reviewed before being copied into a live config. The browser-only workflow helps you test strategy choices without uploading internal configuration.
FAQ
Common questions and answers about this topic.
What does this tool do?
Merges two or more YAML documents into one, combining mappings from all sources with configurable conflict and array strategies.
Can I merge more than two files at once?
Yes — up to 5 inputs can be merged in a single pass. They are combined left-to-right, so the rightmost input has the final say on conflicting keys (unless you switch to A → B).
How are conflicts handled?
By default the value from the later document takes precedence (B → A), and arrays are concatenated. You can switch to A → B to keep the first document's value, or set the array strategy to Replace so the later array wins outright.
Does it merge nested mappings?
Yes — nested mappings are merged recursively under both conflict strategies, and arrays follow the chosen array strategy (Concat or Replace) at every depth.
What scenarios is this useful for?
Common use cases include merging Kubernetes manifests, combining Helm chart values across environments (base + dev/staging/prod overrides), and consolidating multi-file CI/CD config (GitHub Actions, GitLab CI) into a single review-friendly document.
Is my data sent to any server?
No, YAML merging is performed entirely in your browser. Both files are merged locally with JavaScript — nothing is uploaded.