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Format
JSON
Limit
1 MiB total
Runtime
Browser

Compare JSON record arrays by a stable key

Match records by an explicit primitive key instead of their array position.

Local processingNo sign-upNo presets or upload

Compare records by key

Each document is capped at 512 KiB; combined input is capped at 1 MiB.

Tool Swim does not upload, fetch, save, log, or create presets from these values.

Keyed record report

The report states the algorithm, semantics, paths, counts, or conflicts used as proof.

What this tool proves

Explicit, bounded structural semantics

The key pointer is resolved inside every item. Missing, object-valued, array-valued, or duplicate keys fail explicitly so records are never paired ambiguously.

Every record needs one unique primitive key

The key pointer is resolved inside every item. Missing, object-valued, array-valued, or duplicate keys fail explicitly so records are never paired ambiguously.

Each document is capped at 512 KiB, combined input at 1 MiB, traversal at 100,000 values and 100 levels, reports at 10,000 entries, and output at 1 MiB. Source and results stay in the active browser tab.

Parsing and comparison semantics

Inputs use the browser's JSON parser. Duplicate object names therefore keep their last value, object member order is ignored, array order is preserved unless the selected tool explicitly says otherwise, and integers outside JavaScript's safe range are rejected instead of rounded silently.

Primary references

Questions and answers

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