8 tools · 8 run in your browser

Developer tools with no server in the middle

Format JSON, decode a JWT, hash a string, test a regex, diff two files. Every one of these runs locally, which means you can paste production data into them without it going anywhere.

JSON Formatter
Format, validate and minify JSON instantly.
Never uploaded
Base64 Encode / Decode
Encode or decode Base64, UTF-8 safe.
Never uploaded
JWT Decoder
Read a token's header and claims locally.
Never uploaded
UUID Generator
Random v4 UUIDs, as many as you need.
Never uploaded
Regex Tester
Test patterns and inspect every capture group.
Never uploaded

Format & validate2

JSON Formatter

Format, validate and minify JSON instantly.

Never uploaded

SQL Formatter

Readable SQL across five dialects.

Never uploaded

Encode & decode3

Base64 Encode / Decode

Encode or decode Base64, UTF-8 safe.

Never uploaded

URL Encoder / Decoder

Percent-encode query strings and paths.

Never uploaded

JWT Decoder

Read a token's header and claims locally.

Never uploaded

Generate & test3

UUID Generator

Random v4 UUIDs, as many as you need.

Never uploaded

Regex Tester

Test patterns and inspect every capture group.

Never uploaded

Cron Expression Explainer

Read back, in English, when a cron runs.

Never uploaded

Trending in Developer

JSON Formatter

Format & validate2

JSON Formatter

SQL Formatter

Encode & decode3

Base64 Encode / Decode

URL Encoder / Decoder

JWT Decoder

Generate & test3

UUID Generator

Regex Tester

Cron Expression Explainer

Trending in Developer

JSON Formatter

Format & validate2

JSON Formatter

SQL Formatter

Encode & decode3

Base64 Encode / Decode

URL Encoder / Decoder

JWT Decoder

Generate & test3

UUID Generator

Regex Tester

Cron Expression Explainer