Developer tools

Focused utilities for debugging and publishing — JSON, DNS, IP data, and lightweight SEO checks. Your text stays in the browser; DNS and IP tools call public resolvers only.

JSON & data

Format, diff, convert, and generate types from JSON — all in your browser.

JSON format, minify & validate

Pretty-print (2/4/tab), minify for APIs, or validate with line/column errors — one page.

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JSON Diff

Compare two JSON documents — added, removed and changed paths.

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JSON → CSV

Flatten nested JSON into spreadsheet-friendly CSV.

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JSON → TypeScript

Generate TypeScript interfaces from a JSON sample.

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Network

DNS over HTTPS, IP geolocation, ASN and ISP hints.

DNS lookup

Query A, AAAA, MX, TXT, NS and more via DNS-over-HTTPS (Cloudflare 1.1.1.1).

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IP Lookup

Resolve any IPv4/IPv6 — country, city, ISP, ASN and map.

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SEO

Snippet previews and robots.txt checks — client-side, private.

SERP snippet preview

See how title and meta description may look in Google — with length hints.

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robots.txt checker

Paste robots.txt — catch bad sitemap URLs, bad lines, and common mistakes.

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