# API Response Comparator

> Compare Dev, QA, and Prod JSON API responses from a browser popup using pasted JSON, uploaded files, HTTPS URLs, or safe cURL imports.

Canonical page: [https://chrome-stats.com/d/api-response-comparator](https://chrome-stats.com/d/api-response-comparator)

## Overview

- **ID:** `api-response-comparator`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Arnab Nandy
- **Category:** web-development,privacy-security,alerts-updates
- **Daily users:** 1
- **Version:** 0.1.0
- **Last updated:** 2026-07-01
- **First published:** 2026-06-28
- **Size:** 148 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/api-response-comparator/)
- **Website:** [https://github.com/arnabnandy7/api-response-comparator/issues](https://github.com/arnabnandy7/api-response-comparator/issues)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/api-response-comparator/privacy/](https://addons.mozilla.org/firefox/addon/api-response-comparator/privacy/)

## Description

API Response Comparator helps developers and QA teams compare JSON API responses across Dev, QA, and Prod directly from a browser popup. Paste JSON, upload response files, fetch HTTPS API URLs, or import safe cURL commands, then inspect added, removed, changed, and type-changed fields.

The first populated environment in Dev, QA, Prod order becomes the baseline. Any two environments are enough, so you can compare Dev vs QA, QA vs Prod, or all three together.

Features include:
- Manual JSON paste, format, upload, and clear controls
- Direct HTTPS URL fetch comparison
- Safe cURL parsing with structured browser fetch execution
- Ignore leaf fields and volatility-based ignore suggestions
- Contract-change alerts
- Count filters and path search
- Table and color-coded JSON tree views
- Copy, JSON download, and Excel-compatible export
- Full reset with in-flight request cancellation
- Light and dark themes

The extension runs locally in the browser. It does not include analytics, ads, tracking, or a remote backend.

## Rankings

- #108,222 — Overall
- #38 — response
- #147 — compare

## Permissions and access

### Permissions

- `storage`
- `clipboardWrite`

### Host permissions

- `https://*/*`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/api-response-comparator)