Developer Tools
Free developer tools for JSON, regex, timestamps, URLs, SQL, and API debugging
Format JSON, decode JWTs, test regex, convert timestamps, encode URLs, format SQL, check your public IP address, and plan technical workflows.
Practical utilities
Pick a developer workflow
These tools help with debugging, logs, URLs, tokens, API payloads, technical writing, and handoffs between product and engineering.
JSON Editor
Format, validate, inspect, and clean JSON before debugging APIs or schema payloads.
Regex Tester
Test JavaScript regex patterns against sample text and inspect matches before using them in apps.
Timestamp Converter
Convert Unix seconds or milliseconds to UTC dates while debugging logs, tokens, and API fields.
URL Encoder Decoder
Encode query values or decode percent-encoded URLs while checking redirects, callbacks, and requests.
SQL Formatter
Format SQL queries for easier review before reading, sharing, or debugging database logic.
JWT Decoder
Decode token headers and payloads locally without treating decoding as signature verification.
Base64 Encoder Decoder
Encode or decode Base64 strings locally for headers, payloads, fixtures, and docs.
What Is My IP
Check your public IP address and network details for support, VPN, or deployment debugging.
Prompt Generator
Create structured prompts for code review, debugging, documentation, and implementation plans.
Source Comparison Tool
Compare supplied evidence, assumptions, unsupported claims, and verification gaps.
Developer guides
Use these short guides to debug data, check network details, and keep AI-assisted technical work grounded in supplied evidence.
Format and validate JSON online
Catch syntax and structure issues before debugging API or schema problems.
Debug a JSON API response
Separate syntax, shape, type, auth, and error-payload problems before changing backend code.
Decode JWT tokens safely
Inspect token claims without confusing decoded payloads with verified trust decisions.
Base64 encode and decode
Use Base64 for API debugging while remembering encoded data is not encrypted.
Test JavaScript regex online
Check validation and parsing patterns against realistic samples before shipping.
Format SQL before review
Make copied queries readable before debugging filters, joins, grouping, and limits.
Convert Unix timestamps for API logs
Debug seconds, milliseconds, UTC dates, token expiration, webhooks, jobs, and log windows.
URL encode and decode query strings
Inspect callback URLs, redirect parameters, OAuth state, tracking links, and API requests safely.
Check IP address and network details
Understand public IP, network checks, VPN context, and support details.
Check public IP for VPN and allowlists
Compare visible IP changes across VPN, proxy, hotspot, office Wi-Fi, and home networks.
API allowlist IP changed
Debug valid API requests that fail because the visible public IP, VPN route, or server egress changed.
VPN IP leak check
Compare public IP results with VPN off, VPN on, private browsing, and another network.
Compare AI tools without fake citations
Keep technical claims tied to supplied evidence and source checks.
How to use AI for development work
Paste exact context
Include errors, payloads, constraints, expected behavior, and the environment before asking for output.
Separate facts from guesses
Ask AI to label assumptions, missing data, and verification steps for technical work.
Verify before shipping
Run tests, inspect outputs, check security implications, and avoid exposing secrets.