Does this tool catch JSON data type mutations?

Yes. If a field changes from an integer to a string (e.g. 42 to "42") or from an object to an array, the diff tool explicitly flags it as a "TYPE CHANGED" discrepancy with both original and updated types highlighted.

Are my proprietary API responses sent to an external server?

No. The comparison algorithm executes 100% client-side in your browser JavaScript thread. Your API endpoints, user records, and auth tokens never leave your local device.

Can I export the comparison report for pull requests or bug reports?

Yes. You can copy a clean structured text diff or download a timestamped diff report (.txt) to attach directly to GitHub PRs, Jira tickets, or Linear issues.

100% Client-Side & PrivateDeveloper Tools

API Response Diff Checker

Compare two JSON API responses recursively to detect schema drift, added fields, removed keys, and type discrepancies side-by-side.

Baseline Payload

Original API Response (A)

Modified Payload

New API Response (B)

Recursive Diff Breakdown

Deterministic comparison tracking key additions, removals, and value mutations

Awaiting Both PayloadsEnter two valid JSON objects above or click “Try Example” to execute recursive schema diffing.

How to Compare Two JSON API Responses

Detect API schema drift and verify backward compatibility in 3 simple steps.

1. Paste Baseline Response (A)

Paste your production or staging API response into the left editor, or click "Try Example" to explore a sample v1 vs v2 user model.

2. Paste New or Test Response (B)

Paste your local branch, new microservice output, or mock API response into the right editor.

3. Review Color-Coded Differences

The tool recursively traverses every nested object and array, highlighting added fields in green, removed fields in red, and value or type shifts in yellow/purple.

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Frequently Asked Questions

Standard text diff tools compare character-by-character or line-by-line, meaning reordered JSON keys or whitespace variations produce false differences. This tool parses both payloads into abstract syntax trees and performs deterministic recursive object and array key comparison regardless of key order.

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API Response Diff Checker

Compare two JSON API responses recursively to detect schema drift, added fields, removed keys, and type discrepancies side-by-side.

Baseline Payload

Original API Response (A)

Modified Payload

New API Response (B)

Recursive Diff Breakdown

Deterministic comparison tracking key additions, removals, and value mutations

Awaiting Both PayloadsEnter two valid JSON objects above or click “Try Example” to execute recursive schema diffing.

How to Compare Two JSON API Responses

Detect API schema drift and verify backward compatibility in 3 simple steps.

1. Paste Baseline Response (A)

Paste your production or staging API response into the left editor, or click "Try Example" to explore a sample v1 vs v2 user model.

2. Paste New or Test Response (B)

Paste your local branch, new microservice output, or mock API response into the right editor.

3. Review Color-Coded Differences

The tool recursively traverses every nested object and array, highlighting added fields in green, removed fields in red, and value or type shifts in yellow/purple.

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