DevToolbox

Local developer utilities

Portal

Tools

JSON StudioFormat · validate · convert Alt 1 Encoding & HashingBase64 · URL · MD5 / SHA Alt 2 Regex TesterLive matches & groups Alt 3 Time & FormatterUnix ⇄ ISO · live clock Alt 4 GeneratorsUUID v4 · passwords Alt 5

Private by design

Everything runs in this tab. A strict Content-Security-Policy (connect-src 'none') blocks all network requests, and your inputs are never stored.

JSON Studio

100% local

Input format

Indentation

Sort keys

CSV delimiter

Nested keys (a.b) Infer types

Convert to Ctrl + Enter prettifies

Input

Empty

Open

0 chars · 0 linesFiles are read locally — nothing is uploaded

Output

—

No output yetStrict JSON · RFC 4180 CSV · YAML 1.2 subset

Base64

Waiting for input

URL-safe Data URL

Text to encode (UTF-8)

File

Base64 output

URL encode / decode

Waiting for input

Form (+ = space)

Input

Output

Hash generator

Waiting for input

Text (hashed as UTF-8) File

Verify against a known hash

SHA digests use the native Web Crypto API. MD5 runs on a local implementation (Web Crypto doesn't provide it). MD5 and SHA-1 are broken for security — use them only for checksums.

Regular expression

—

/ /

Flags

Test string

match next match

0 charsRuns in a sandboxed worker with a 2 s timeout

Substitution

Matches & capture groups

Live· Current Unix timestamp

— seconds

— ms

ISO 8601 (UTC)

—

Local time

—

Time zone

—

Timestamp ⇄ date converter

Edit either side — the other updates instantly

Unix timestamp

Seconds, ms, µs or ns — auto-detected

Date & time

YYYY-MM-DD HH:mm:ss, ISO 8601 or RFC 2822

UUID v4 batch generator

Ready

How many (1–1000)

Hyphens Uppercase {Braces} JSON array

RFC 9562 version 4 · 122 random bits each

Secure password generator

— 0 bits entropy · cracked in —

Length

Lowercasea–z UppercaseA–Z Digits0–9 Symbols!@#$…

Symbol set

Exclude look-alikes (I l 1 O 0 o)

Words

Separator

Capitalize Add a digit

crypto.getRandomValues · unbiased rejection sampling Crack time assumes 10 billion guesses/s