developer-tools

Found 141 articles tagged with "developer-tools"

How to Enable CORS in Express and Next.js

CORS is enabled on the server, not the browser. Working Express, FastAPI and Next.js configs, how preflight works, and the six errors Chrome prints, with fixes.

DevToolLab Team·October 9, 2026

Latest Articles

Tutorial

8 min

How to Spot AI Crawlers in Server Logs

Search your access log for GPTBot, ClaudeBot and PerplexityBot, then check each IP against the vendors' published ranges. Includes a Python script and output.

DevToolLab Team·October 9, 2026

How to Verify HubSpot Webhook Signatures

Tutorial

8 min

How to Verify HubSpot Webhook Signatures

HubSpot signs webhooks with HMAC SHA-256 over method, URL, body and timestamp. A tested Node.js verifier, a Python cross-check and the pitfalls behind 401s.

DevToolLab Team·October 9, 2026

Best HubSpot Alternatives for Developers

Guide

11 min

Best HubSpot Alternatives for Developers

HubSpot, Attio, Twenty, Close and EspoCRM compared on published API limits, webhooks, licenses and per-seat prices, plus how long a 50,000-record sync takes.

DevToolLab Team·October 9, 2026

11–20 of 141

Tutorial

7 min read

How to Generate an SSH Key for GitHub

Run ssh-keygen -t ed25519, load the key into ssh-agent, paste the .pub file into GitHub, then test with ssh -T. Commands for Mac, Windows and Linux.

DevToolLab Team·October 1, 2026

Tutorial

8 min read

How to Track AI Referral Traffic in GA4

GA4 now puts ChatGPT, Claude and Perplexity visits in an AI Assistant channel, but it missed 5.5% of our AI sessions. The custom channel and regex that fix it.

DevToolLab Team·October 1, 2026

Guide

9 min read

Best AI Search APIs for Agents in 2026

Exa, Tavily, Brave, Parallel, Perplexity and Serper priced on one workload of 100,000 agent searches a month, plus self-hosted SearXNG.

DevToolLab Team·September 30, 2026

Tutorial

7 min read

OpenAI Rate Limits in Python: Fix 429s

Handle OpenAI 429 rate limit errors in Python with the SDK's built-in retries, exponential backoff with jitter and a fallback to a second provider.

DevToolLab Team·September 30, 2026

Tutorial

8 min read

How to Validate a Credit Card Number

Strip spaces, check for 12 to 19 digits, run the Luhn checksum, then match the prefix to a brand. Working code in JavaScript, Python and Java, plus the errors.

DevToolLab Team·September 29, 2026

Playwright vs Cypress vs Selenium in 2026

Guide

10 min read

Playwright vs Cypress vs Selenium in 2026

Playwright, Cypress and Selenium compared on stars and downloads, plus what BrowserStack, Sauce Labs and TestMu AI charge to run them in CI.

DevToolLab Team·September 28, 2026

Best API Documentation Platforms in 2026

Guide

11 min read

Best API Documentation Platforms in 2026

Mintlify, ReadMe, Stoplight, Redocly and Scalar priced on what a custom domain and white-labeling cost, plus Swagger UI, the open-source core under most.

DevToolLab Team·September 27, 2026

Tutorial

8 min read

How to Use curl: 12 Commands for APIs

curl commands for GET, POST, PUT and DELETE, JSON and form data, bearer tokens, redirects and timing, plus fixes for the errors curl actually throws.

DevToolLab Team·September 27, 2026

Best WAF and Bot Detection Tools in 2026

Guide

10 min read

Best WAF and Bot Detection Tools in 2026

Cloudflare, DataDome, HUMAN Security and Akamai compared on real pricing and behavior, plus CrowdSec, the open-source WAF that costs nothing to self-host.

DevToolLab Team·September 26, 2026