Free Developer Tools
Format JSON, encode Base64, decode JSON Web Tokens, diff text, test regular expressions and send REST API requests — six fast, private browser tools. Everything runs locally, nothing is uploaded, and there is no sign-up.
JSON Formatter
Format, validate, beautify and minify JSON with clear error messages and a collapsible tree view. Paste, fix and copy in seconds.
Open EncodingBase64 Encoder & Decoder
Convert text to Base64 and back — UTF-8 safe (emoji included), with a URL-safe option. Runs entirely in your browser, nothing uploaded.
Open AuthJWT Decoder
Decode a JSON Web Token's header and payload with human-readable expiry. Decode-only — your token never leaves the browser.
Open CompareText Diff
Compare two blocks of text line by line and see exactly what was added or removed, with counts. Instant and fully client-side.
Open RegexRegex Tester
Test a regular expression against your text live — matches highlighted and counted, with captured groups. Uses the JavaScript engine.
Open HTTPAPI Tester
Send HTTP requests to any REST API and inspect the status, timing, headers and body. Works with public endpoints and localhost.
OpenFrequently Asked Questions
What are the LK Forge Developer Tools?
A free suite of browser-based utilities: a JSON Formatter, a Base64 Encoder and Decoder, a JWT Decoder and a Text Diff. Everything runs in your browser — nothing you paste is uploaded or stored — and there is no sign-up.
Are the developer tools free and private?
Yes. Every tool is completely free with no account and no usage cap. All work runs client-side in JavaScript, so nothing you paste leaves your device, and each tool keeps working offline once loaded.
Does the JWT Decoder verify the signature?
No. The JWT Decoder is decode-only: it reads and displays the header and payload so you can inspect a token's claims and expiry, but it does not verify the signature and never sends the token anywhere.