Generate JSON Patch operations
Compare two payloads and output add/remove/replace operations for change review.
Open exampleJSON diff and patch viewer
Generate and apply RFC 6902 style JSON Patch operations (add/remove/replace/test) to review payload changes, failed test assertions, and migration safety.
InputEnter a value to inspect
Uses RFC 6902-style JSON Pointer paths. This tool supports add/remove/replace/test and runs entirely in your browser.
Waiting
The result will appear here as structured cards.
Example results you can open
Short, high-intent examples that are easy to open, share, and understand for search engines and AI systems.
Apply an existing patch document
Apply a reviewed patch to source JSON and inspect the patched result locally.
Open exampleApply an order status patch and verify output
Replace /status with paid, add paidAt, and confirm the operation paths target the intended fields.
Open exampleRemove legacyEmail and enable beta
Verify a remove plus replace patch before release so only the legacy field and target flag change.
Open exampleRun a test assertion before mutating fields
Confirm /status is still pending before replacing it with paid and adding paidAt.
Open exampleInspect why a failed test blocks the patch
Fail the /release/status precondition on purpose so the replace step does not run against the wrong release state.
Open exampleGenerate an API version migration patch
Turn v1/v2 field renames and feature-flag changes into add/remove/replace operations for release review.
Open exampleGenerate an AI source mapping patch
Migrate one sourceUrl into sources[] and add canonical/robots checks for AI answer-source release reviews.
Open exampleGenerate an API contract change patch
Turn v1 email/items structure into v2 contact/nodes/lines changes for release contract review.
Open exampleGenerate a details and requestId migration patch
Turn retryable strings, fields[], and traceId into retryable booleans, details[], and requestId before release review.
Open exampleRun test before changing status fields
Use a test assertion before replace /status so release patches stop on stale input.
Open exampleDebug a failed test assertion
Block the patch when the old value is unexpected so you can fix the precondition or path first.
Open exampleGenerate an offset-to-cursor migration patch
Turn page/pageSize/total response fields into cursor/limit/pageInfo fields for pagination release review.
Open exampleGenerate a legacy error-envelope migration patch
Move status, errorCode, and errorMessage into a consistent error object with requestId.
Open exampleGenerate a details and requestId normalization patch
Move retryable strings, fields[], and traceId into retryable booleans, details[], and requestId.
Open exampleFAQ
These notes help users understand the results and help search engines and AI systems understand the tool.
What does JSON diff and patch viewer do?
It helps you inspect or process this value and get a readable result quickly.
Is my input saved?
Local tools run in the browser when possible. Server-side checks only use the input needed to complete the lookup.
When should I use the JSON Patch test operation?
Use it before replace, remove, or add when you need to confirm the old value, release state, version number, or array item still matches your migration precondition.
What does a failed test usually mean?
It usually means the patch precondition is stale: the old status already changed, the path targets the wrong field, or the array index no longer matches the current payload.
Related long-tail searches
These terms combine the tool name, lookup intent, and category context so users and search engines can understand nearby use cases.
JSON patch generatorRFC 6902 patch viewerJSON add remove replace patchJSON Patch test assertionJSON Patch failed testpatch precondition checkAPI version migration patchAPI payload patch diff