Private developer workflow
Free API Debugging Tools for JSON, Base64, URLs, Logs, and Regex
Debug API responses locally with a focused set of browser tools. Format JSON, decode encoded fields, compare payloads, convert timestamps, and copy clean output without sign-ups or server uploads.
Format the response
Paste raw API JSON, validate syntax, beautify nested payloads, or minify before sharing a snippet.
Open JSON Formatter →Decode encoded fields
Decode Base64 tokens, URL-encoded query strings, HTML entities, or file payloads without sending data to a server.
Open Base64 Decoder →Check IDs, logs, and patterns
Convert Unix timestamps, compare response versions, test regex patterns, or generate hashes for reproducible debugging.
Open Timestamp Converter →Tool comparison
Pick the right helper for each API problem
This landing page is a shortcut for developers who know the debugging job but not the exact Toolflix tool name yet.
JSON Formatter & Validator
Beautify, validate, tree-view, and minify API responses.
Open tool →URL Encoder & Decoder
Encode query params and decode callback URLs safely.
Open tool →Base64 Encoder & Decoder
Decode JWT parts, webhook payloads, and data URI strings.
Open tool →Timestamp Converter
Convert epoch seconds, milliseconds, UTC, and ISO log times.
Open tool →Regex Tester
Check validation patterns, capture groups, and replacements.
Open tool →Text Diff Checker
Compare two API responses or config versions side by side.
Open tool →Hash Generator
Generate checksums for payloads, signatures, and cache keys.
Open tool →HTML Entity Encoder
Escape API text before pasting it into HTML or docs.
Open tool →API response debugging checklist
- Paste the response into the JSON Formatter and fix syntax errors first.
- Decode suspicious Base64, URL-encoded, or HTML-escaped fields.
- Convert timestamps to confirm timezone, seconds, and milliseconds issues.
- Use Diff Checker before and after a code change to isolate payload changes.
- Use Regex Tester only after you have a small sample field to validate.
Frequently Asked Questions
Are these API debugging tools safe for private payloads?
Yes. The linked Toolflix tools run in your browser, so formatting, encoding, decoding, and comparisons happen locally without server uploads.
Which tool should I open first for a broken API response?
Start with the JSON Formatter if the response is JSON. Then use URL Encoder, Base64 Decoder, Timestamp Converter, Regex Tester, or Diff Checker based on the field you need to inspect.
Can I use this workflow for webhook debugging?
Yes. You can format webhook JSON, decode Base64 or URL-encoded fields, convert timestamps, and compare payload versions with the tools linked here.