YAML Diff Tool
without reorder noise.
YAML config drift is hard to review when service blocks move around or deployment values are nested several levels deep.
DiffViewr parses YAML as configuration, aligns Target B to the structure of Template A, and highlights the real changes without treating duplicate keys as acceptable parser behavior.
Client-side compare. No upload. Duplicate keys blocked before review.
services: api: image: ghcr.io/acme/payments-api:1.8.2 ports: - "8080:8080" environment: LOG_LEVEL: info FEATURE_AUDIT: "true" REDIS_URL: redis://redis:6379 deploy: replicas: 2 worker:Service, environment, and deploy blocks stay scoped so repeated keys in different objects remain valid.
Duplicate keys inside the same YAML mapping are blocked before comparison.
Target B can be copied back with key order aligned to the template.
FAQ
YAML comparison details
Does DiffViewr support YAML duplicate keys?
It detects duplicate keys within the same YAML mapping and treats the file as invalid. Same key names in different nested mappings are valid.
Are YAML arrays compared as duplicate values?
No. Duplicate values inside YAML lists are allowed. The duplicate-key rule only applies to mapping keys.
Are comments and anchor syntax preserved in the aligned output?
The parser can read standard YAML structures, but the aligned output is normalized config text. Source comments and exact anchor syntax should not be treated as preserved formatting.
Can I compare Kubernetes or Docker Compose YAML?
Yes for single YAML documents that parse as mappings or lists. Multi-document streams are not the intended input for this comparer.
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