Developer Tool Guides & Tutorials - Page 3
Step-by-step guides for the 64 free online tools on dsjson.com: JSON formatting, encoding, hashing, image and PDF handling, with practical examples and troubleshooting.
30 guides in total · page 3 of 3
Which Code Formatter Do You Need? JS, CSS, SQL, Python
Format code without breaking it. JS automatic semicolon insertion, Python's indentation rule, SQL dialect quoting, and HTML tags you must never minify.
MD5 vs SHA-256: What Hashes Prove and Which to Use
What a hash can and cannot prove. Output lengths for MD5, SHA-1 and SHA-256, how to verify a downloaded file, and why unsalted hashes fail for passwords.
How to Compress Images Without Ruining Them
Compress images the right way. Why resizing beats lowering quality, the 75-85 quality sweet spot, how much WebP saves over JPEG, and the EXIF data to strip.
How to Format and Validate JSON Online (Fix Every Parse Error)
Format and validate JSON in three steps, with a table of every common parse error (Unexpected token, trailing comma, BOM) and the exact fix for each.
How to Test Regular Expressions (Greedy, Groups, ReDoS)
Most regex bugs come from three causes: missing anchors, greedy quantifiers, and catastrophic backtracking. Learn all three plus a pattern cheat sheet.
Unix Timestamp Conversion: Seconds, Milliseconds and 2038
Convert Unix timestamps correctly. Learn what 10, 13, 16 and 19-digit values mean, why timezones never affect a timestamp, and how the 2038 bug still bites.