YAML Merge Tool

Parse two YAML documents and merge mappings locally with an explicit conflict strategy.

Base YAML

Overlay YAML

Array conflict behavior

ReadyMappings merge recursively; scalar conflicts use the overlay. Array behavior is explicit above. YAML comments and anchor presentation are not preserved after structural parsing.

Before using the YAML

Parse first, then choose a target format whose data model matches the job. Conversion success does not prove that an application will accept the resulting config.

Format / validateConfirm the YAML parses before migration.

Inspect structureCheck mappings, arrays, paths and scalar types.

Choose target modelTOML has tables; Properties and ENV are fundamentally string-key/value formats.

ConvertUse explicit flattening/type rules rather than hidden guesses.

Verify in contextReview application-specific schema and semantics before replacing production config.

Format Validate Tree Find path YAML → JSON JSON → YAML YAML → XML XML → YAML YAML → TOML TOML → YAML YAML → Properties Properties → YAML YAML → ENV

conversions run in the browser. The new TOML path targets common configuration syntax rather than claiming a complete TOML conformance suite; Properties nesting is an explicit WebToolArc convention, not part of Java Properties itself.

Deep-merge override ledger & conflict policy

Merge base and overlay YAML while exposing exactly what changed. Choose array and null conflict policies, then inspect added, changed, removed/kept paths instead of treating the merged document as an unexplained final blob.

Base YAMLOverlay YAMLArray conflictsNull overlay

—Changed paths

—Added

—Replaced

—Removed

Ready.

Path	Base	Overlay	Merge action

Mapping conflicts merge recursively. Scalars use the overlay. Array and null behavior are explicit because those policies materially change configuration semantics.

Before converting YAML

Format and validate first, inspect the parsed structure, then convert only after deciding how the target format should represent arrays, nested mappings and scalar types.

Syntax is not application validity

A YAML document can parse successfully and still be invalid for Kubernetes, Docker Compose, GitHub Actions, CI/CD, OpenAPI or another application schema.