https://demo.lumatic-labs.com/ New guides and posts from Lumatic Labs: small, useful, private-by-default web tools that run entirely in your browser. en Mon, 19 Oct 2026 09:00:00 +0000 https://demo.lumatic-labs.com/guides/json-to-csv-python/ https://demo.lumatic-labs.com/guides/json-to-csv-python/ Convert JSON to CSV in Python with pandas: read_json and json_normalize for nested data, the csv module fallback, and the errors you will hit. Mon, 19 Oct 2026 09:00:00 +0000 https://demo.lumatic-labs.com/guides/json-patch/ https://demo.lumatic-labs.com/guides/json-patch/ Apply an RFC 6902 JSON Patch with runnable snippets for JavaScript, Python, Go, Java and C#: install lines, complete code, the six ops. Thu, 15 Oct 2026 09:00:00 +0000 https://demo.lumatic-labs.com/guides/python-json-pretty-print/ https://demo.lumatic-labs.com/guides/python-json-pretty-print/ Pretty print JSON in Python with json.dumps(indent=2): the one-liner, reading and writing files, the terminal json.tool, and the errors you will hit. Sun, 11 Oct 2026 09:00:00 +0000 https://demo.lumatic-labs.com/guides/url-parts/ https://demo.lumatic-labs.com/guides/url-parts/ See every part of a URL: scheme, host, port, path, query string and fragment. How parsers work in Python and JavaScript, plus a live tool. Sun, 11 Oct 2026 09:00:00 +0000 https://demo.lumatic-labs.com/guides/image-to-base64/ https://demo.lumatic-labs.com/guides/image-to-base64/ Convert images to Base64 data URIs for HTML, CSS and JSON, and decode Base64 back to an image. Pros, size limits, and the in-browser tool. Mon, 05 Oct 2026 09:00:00 +0000 https://demo.lumatic-labs.com/blog/ai-content-pipeline/ https://demo.lumatic-labs.com/blog/ai-content-pipeline/ Our AI content pipeline produced a post that was correct, optimized, and boring. Here is the six-point fix we shipped, so your AI content avoids the same trap. Sat, 03 Oct 2026 09:00:00 +0000 https://demo.lumatic-labs.com/guides/uuid-python/ https://demo.lumatic-labs.com/guides/uuid-python/ Generate UUIDs in Python with the uuid module: uuid4 for random IDs, uuid7 for time-ordered ones, plus validation and bulk generation. Sat, 03 Oct 2026 09:00:00 +0000 https://demo.lumatic-labs.com/guides/json-diff/ https://demo.lumatic-labs.com/guides/json-diff/ Compare two JSON files and spot real differences: normalize first, use an online checker, or diff in git. Three methods that survive nested objects. Fri, 02 Oct 2026 09:00:00 +0000 https://demo.lumatic-labs.com/guides/discord-timestamps/ https://demo.lumatic-labs.com/guides/discord-timestamps/ How Discord timestamps work: every timestamp code from t to F, dynamic vs static times, a full format table, and a quick way to build the code. Thu, 01 Oct 2026 09:00:00 +0000 https://demo.lumatic-labs.com/guides/sha256-file-checksum/ https://demo.lumatic-labs.com/guides/sha256-file-checksum/ Check a file's SHA256 checksum on Windows, macOS and Linux, compare it against the published hash, and confirm a download was not corrupted. Thu, 01 Oct 2026 09:00:00 +0000 https://demo.lumatic-labs.com/guides/unix-timestamp-excel/ https://demo.lumatic-labs.com/guides/unix-timestamp-excel/ Convert a Unix timestamp to an Excel date with =(A1/86400)+DATE(1970,1,1). Seconds, milliseconds, and back again, plus the timezone trap. Thu, 01 Oct 2026 09:00:00 +0000 https://demo.lumatic-labs.com/guides/uuid-v7/ https://demo.lumatic-labs.com/guides/uuid-v7/ UUID v7 generates time-ordered IDs that keep database indexes fast. How it works, v4 vs v7, and one-click generation in your browser. Thu, 01 Oct 2026 09:00:00 +0000 https://demo.lumatic-labs.com/guides/uuid-versions/ https://demo.lumatic-labs.com/guides/uuid-versions/ All 8 UUID versions in plain language: what v4 and v7 actually are, how they differ, and which to pick for database keys, request IDs and logs. No jargon. Thu, 01 Oct 2026 09:00:00 +0000