Best Developer Tools for Debugging APIs

Centralize Your Debug Workflow

Paste, inspect, and fix without leaving the browser. Start from the Developer Tools hub and bookmark the tools below for everyday incidents.

JSON Formatter

Beautify payloads, highlight syntax errors, and export minified fixtures with the JSON Formatter. Pair it with the JSON Formatter vs JSON Minifier comparison when teammates ask which option they need, and reference the How to Format JSON for API Debugging guide for a full workflow.

JSON Minifier & Pretty Print

Use the JSON Minifier or JSON Pretty Print to prep payloads for transport or testing harnesses.

JWT Decoder & Base64 Encoder

Inspect tokens via the JWT Decoder and sanitize attachments with the Base64 Encoder/Decoder.

HTTP Header Checker & URL Parser

Confirm caching, auth, and referrer policies using the HTTP Header Checker, then dissect complex URLs with the URL Parser.

Timestamp Converter & UUID Generator

Translate epoch values inside the Timestamp Converter and generate IDs via the UUID Generator when seeding tests.

Triage Playbook

1. Capture the raw response, format it, and log diffs with Text Compare.

2. Decode JWTs and Base64 blobs to isolate tampering.

3. Validate headers, redirects, and query params before escalating.

4. Document learnings inside your runbook and link here plus the Tools for Developers guide.

Need a faster workflow? Try the Json Formatter Online — Format, validate, and beautify your JSON data online instantly.

Need a faster workflow? Try the Json Formatter Pretty Print — Format, validate, and beautify your JSON data online instantly.

Need a faster workflow? Try the Json Validator — Format, validate, and beautify your JSON data online instantly.

Need a faster workflow? Try the Json Beautifier — Format, validate, and beautify your JSON data online instantly.