Question 1

How to use jsondiffpatch for undo/redo in a React app?

Accepted Answer

Compute deltas on state changes using jsondiffpatch.diff(), store them in a history stack, and apply reverse deltas with jsondiffpatch.reverse() for undo. For React integration, consider using jsondiffpatch-react or managing state with libraries like Redux.

Question 2

jsondiffpatch vs deep-diff: which is better for nested objects?

Accepted Answer

jsondiffpatch excels with its accurate deep diffing, multiple output formats, and reversible operations, making it superior for undo/redo and visualization. deep-diff is simpler and lighter but lacks these advanced features and standardized patch formats.

Question 3

How do I configure objectHash for matching objects in arrays?

Accepted Answer

Pass an objectHash function when creating the diffpatcher instance, such as returning a unique identifier like obj.id or obj._id. This ensures objects are matched correctly during array diffing, preventing errors from position-based matching.

Question 4

Can jsondiffpatch handle circular references in JSON?

Accepted Answer

No, jsondiffpatch does not natively support circular references, as JSON.stringify()—used internally—fails on them. You must flatten or normalize the data before diffing to avoid serialization issues.

Question 5

How to generate JSON Patch (RFC 6902) with jsondiffpatch?

Accepted Answer

Use the built-in JSON Patch formatter by importing it from the library. After computing a delta, convert it to RFC 6902 compliant patches, which can be applied with standard JSON Patch libraries for API interactions.

Question 6

What's the performance impact of jsondiffpatch on large datasets?

Accepted Answer

Performance can degrade with very large or complex objects due to deep diffing algorithms. Optimize by using propertyFilter to ignore volatile data, limiting diff depth, or diffing only specific sections to reduce overhead.

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