Data & Developers
How to Format JSON: Pretty-Print, Validate and Read Errors
Paste JSON into a formatter to indent it and catch errors. The exact syntax rules, how to read an error position, and how to do it in VS Code, Python and jq.
10 min read
Data & Developers
JSON, CSV, Excel, code and data-conversion guides for developers and analysts.
Data & Developers
How to Minify CSS, JavaScript and HTML: Real Savings and Risks
Minifying strips comments and whitespace so files download faster. Measured savings on real files, minify vs gzip and brotli, source maps, and when it breaks code.
9 min read
Data & Developers
Unix Timestamp Converter: Epoch Time Explained
Convert Unix timestamps to human dates and back free online — what epoch time is, why developers use it, and the year-2038 problem.
2 min read
Data & Developers
What Is My IP Address? IP Lookup Explained
Check and understand an IP address free online — public vs private, IPv4 vs IPv6, and what your IP does (and doesn't) reveal about you.
1 min read
Data & Developers
Credit Card Validator: How the Luhn Check Works
Check if a card number is validly formatted with the Luhn algorithm free online — how the checksum works and what it does (and doesn't) prove.
2 min read
Data & Developers
How to Convert Excel to CSV (Save As, Multiple Sheets, Free Tool)
Save Excel as CSV with File › Save As › CSV UTF-8, convert each sheet separately, or use a free browser tool. What each option keeps, changes and loses.
7 min read
Data & Developers
How to Convert CSV to Excel Without Losing Zeros or Hindi Text
Convert CSV to Excel with a free browser tool, Excel's From Text/CSV import or Google Sheets, and keep leading zeros, long numbers, dates and Hindi text intact.
9 min read
Data & Developers
How to Convert Excel to JSON: Headers, Sheets, Dates and Empty Cells
Upload an .xlsx file and get a JSON array with one object per row, keyed by the header row. How sheets, dates (serial numbers), empty cells and types come out.
7 min read
Data & Developers
How to Convert CSV to JSON (and JSON Back to CSV)
Paste CSV into a free converter and get a JSON array of objects keyed by the header row. How it treats headers, quotes and types, and how to go back to CSV.
7 min read
Data & Developers
How to Beautify CSS, HTML and XML (Online, VS Code, Prettier)
Beautifying adds line breaks and indentation so minified CSS, HTML or XML is readable again. How the free formatters work, their limits, and VS Code and Prettier.
9 min read
Data & Developers
JSON to YAML: How to Convert, What to Quote, and the Norway Problem
Convert JSON to YAML for Kubernetes, GitHub Actions or Docker Compose: how the syntax maps, the Norway problem, values you must quote, and the converter's limits.
7 min read
Data & Developers
JSON to TypeScript Interfaces: What Gets Inferred, What to Fix
Paste a JSON sample and get TypeScript interfaces. What the generator infers, what it misses (optional fields, null, unions, dates) and how to fix each by hand.
7 min read