When you upgrade an API from v1 to v2, or deploy a new backend version, the response shape might change. New fields get added, deprecated fields get removed, and value formats might shift. Our JSON Diff tool lets you paste both versions side-by-side and see exactly what changed.
Detecting Breaking Changes
A breaking change is any response modification that causes existing clients to fail — removed fields, changed types (string to number), or restructured nesting. The diff highlights these in red so you can document them in your API changelog before releasing.
Staging vs Production Comparison
Before promoting a staging deployment to production, hit the same endpoint on both environments and diff the responses. This catches unintended data differences caused by database migrations, feature flags, or environment-specific configuration.
GraphQL Schema Evolution
GraphQL introspection queries return the full schema as JSON. Diff two versions of __schema to see which types, fields, and arguments were added or deprecated. This is essential for maintaining backward compatibility in federated GraphQL architectures.
Privacy & Security
All processing happens in your browser's local memory. Your data — whether it's API responses containing authentication tokens, Kubernetes cluster configurations, or database exports with PII — never touches any external server. JSON Studio is 100% client-side by design.