API Error Decoder

Extension Developer Tools

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Overview

Debug HTTP errors instantly. Capture 4xx, 5xx, CORS & network failures, replay requests, and export to Postman — right in DevTools.

API Error Decoder — Debug HTTP Failures Instantly Stop guessing why your API calls fail. API Error Decoder captures every 4xx, 5xx, network, and auth error in real time — right inside Chrome DevTools. How it works Click Start Capture, browse or interact with your page, and failed requests appear automatically. No manual filtering. No console spelunking. Click any failure to see headers, request body, response body, and a plain-English diagnosis. Free features - Capture 4xx, 5xx, auth (401/403), validation (422), rate-limit (429), and network failures - Instant diagnosis: understand exactly why each request failed - Filter by error type: Auth, Validation, Rate Limit, Network, and more - Toggle: first-party only, deduplicate repeated failures Pro features (one-time payment) - Replay — re-send any captured request directly from the panel - JWT Inspector — decode and inspect JWT tokens in request headers - Export — download as cURL command, Postman collection, or JSON debug package - Session History — browse and reload past capture sessions Who it's for - Frontend developers debugging API integrations - Full-stack engineers tracking down backend errors - QA engineers reproducing flaky failures - No account required to start. Install, open DevTools, and capture your first failure in seconds. Support: https://100plus.tools/extensions/api-error-decoder/support Privacy Policy: https://100plus.tools/extensions/api-error-decoder/privacy Terms of Service: https://100plus.tools/extensions/api-error-decoder/terms

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Details

Version
1.0.1
Updated
April 22, 2026
Features
Offers in-app purchases
Flag concern
Offered by
100Plus Tools
Size
191KiB
Languages
English
Developer
Email
sgprodev2017@gmail.com
Non-trader
This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

Manage extensions and learn how they're being used in your organization

API Error Decoder has disclosed the following information regarding the collection and usage of your data. More detailed information can be found in the developer's privacy policy.

API Error Decoder handles the following:

Personally identifiable information

Authentication information

This developer declares that your data is

Not being sold to third parties, outside of the approved use cases
Not being used or transferred for purposes that are unrelated to the item's core functionality
Not being used or transferred to determine creditworthiness or for lending purposes

Support

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rep+

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Console Copy Tool

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Automatically captures and copies formatted console messages from Chrome DevTools

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XApi HTTP Client - API Tool, Modify Header & Response

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Network Logger - HAR Exporter

5.0

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DevTools Export

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Export Console Logs, LocalStorage, HTTP requests from DevTools with headers, body, and response data for easy debugging and sharing.

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0.0

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ReloadScope - API Monitor & Network Tracker

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Track, analyze & debug REST/JSON API requests. HTTP Network Inspector with session management, HAR export & request replay.