Local-first developer tool guides
Practical workflows for formatting JSON, decoding JWTs, checking redirects, auditing security headers, and handling data you hesitate to paste into generic online tools.
Topic clusters
Start with a hub when you are exploring a broader workflow.
Sensitive Data Tools
Browser-local workflows for JSON, JWTs, PDFs, images, hashes, and other data you hesitate to paste online.
6 guides, 22 tools
HubJWT and Auth Debugging
Decode JWTs locally, inspect claims, check expiration, and understand the line between decoding and validation.
3 guides, 4 tools
HubTechnical SEO Checks
Debug redirects, headers, security policies, metadata, robots.txt, and URL structure before launches or migrations.
2 guides, 10 tools
HubLocal PDF and Image Tools
Prepare PDFs and images locally before upload, including merges, splits, compression, resizing, and metadata stripping.
2 guides, 5 tools
HubUpdated 2026-05-25
Local-First Developer Tools for Sensitive Data
A practical hub for choosing browser-local tools when working with JSON, JWTs, PDFs, images, hashes, and other data you hesitate to paste online.
HubUpdated 2026-05-25
Debug JWT Tokens Locally
A JWT debugging hub for decoding tokens, checking expiration, inspecting claims, and understanding why decoded does not mean trusted.
HubUpdated 2026-05-25
Technical SEO Debugging Tools
A technical SEO hub for checking redirects, response headers, metadata, robots.txt, URL parts, and launch-blocking crawl issues.
HubUpdated 2026-05-25
Local PDF and Image Tools
A browser-local hub for merging PDFs, splitting documents, compressing PDFs, resizing images, and stripping image metadata before upload.
Updated 2026-05-25
How to Format JSON Without Uploading It
A local-first workflow for formatting and validating sensitive JSON API responses, logs, and webhook payloads in your browser.
Updated 2026-05-25
Is It Safe to Use Online JSON Formatters?
A practical safety checklist for formatting JSON that may contain API responses, logs, tokens, emails, or customer data.
Updated 2026-05-25
How to Validate a JSON API Response
Validate and inspect JSON API responses locally before adding payloads to code, docs, tests, or support tickets.
Updated 2026-05-25
How to Decode a JWT Locally
Inspect JWT headers, payloads, and claims in your browser without uploading the token to a third-party decoder.
Updated 2026-05-25
How to Check JWT Expiration
Use exp, iat, and nbf claims to debug expired or not-yet-valid JWTs without uploading the token.
Updated 2026-05-25
Is It Safe to Paste JWT Tokens Into Online Decoders?
A safety checklist for decoding JWTs, understanding token sensitivity, and choosing local inspection over upload-based tools.
Updated 2026-05-25
How to Check Redirect Chains for SEO
Trace 301, 302, 307, and 308 redirects before a migration, cleanup, or canonical URL change.
Updated 2026-05-25
How to Audit Security Headers Before Launch
A practical launch checklist for CSP, HSTS, X-Frame-Options, Referrer-Policy, Permissions-Policy, CORS, and cross-origin isolation headers.
Updated 2026-05-25
How to Remove Image Metadata Before Uploading
Strip EXIF and editor metadata locally before uploading photos, screenshots, product images, or support attachments.
Updated 2026-05-25
How to Merge PDFs Locally in Your Browser
Combine PDF files in the browser without uploading documents to a third-party merge service.