Category · 9 tools
Free developer tools that respect your data
Developer utilities are small but you need them constantly: pretty-printed JSON before a code review, a Base64 string for a data URI, a quick check that an API response is valid. The last thing you want is to paste production data into a random site.
Every tool in this category processes input locally in the browser. JSON parsing, validation and Base64 encoding happen in JavaScript on your machine, so payloads, tokens and configuration snippets never cross the network. The editor is keyboard-first and the output is copyable in one click.
In this category
- Base64 Decoder
- Base64 Encoder
- JSON Formatter
- Password Generator
- QR Code Generator
- Timestamp Converter
- URL Decoder
- URL Encoder
Format JSON and encode Base64 locally
Small tools for the data you should not paste anywhere
Developer utilities usually sit next to production data: API responses, JWTs, configuration snippets, customer payloads. Uploading that to a random website is a bad habit. Everything here parses and formats locally in JavaScript, so the payload never crosses the network. JSON formatting and validation happen against RFC 8259, which is stricter than JavaScript object syntax — trailing commas and comments are rejected, and the error message points at the line and column where parsing failed.
Base64 is an encoding, not encryption: it makes binary data safe to move through text-only channels but anyone can decode it. Use it for data URIs, email attachments and JWT segments, never for secrets. If you are checking a token, remember that the payload is readable by design — only the signature is protected.
- A minified API response before review
- JSON Formatter with two-space indentation makes diffs readable; minify again for a compact paste.
- Finding the line that breaks JSON
- The validator reports the failing line and column and keeps the original text untouched.
- A small image as a data URI
- Base64 Encode turns the file into text, with line wrapping off for CSS copy-paste.
Guides for Developer Tools
All guidesThe format background, trade-offs and failure modes behind these tools — written for people who want to know why a conversion works the way it does.