Blockly Playground

Building small programs by dragging and connecting blocks instead of typing syntax — the same visual-programming model used by Scratch, Code.org, and MakeCode, powered by Google's open-source Blockly library running entirely in your browser.

Drag a print block (in the Text category) into your program and connect a value to it. Click Run to execute the generated JavaScript; each print call appends a line to the Output panel below.

Logic (if/else, comparisons, booleans), Loops (repeat, while, for), Math (numbers, arithmetic, random), Text (strings, joining, length, print), Lists (create, length, index), plus dynamic Variables and Functions categories.

Runtime errors are caught and shown as an inline alert instead of silently failing or breaking the page; any output already printed before the error stays visible.

Blockly compiles your blocks into real JavaScript source (shown live in the Generated JavaScript panel), which runs directly in your browser via a scoped function — nothing is sent to a server.

Yes. Click Share to copy a URL that encodes your current blocks, so anyone who opens the link sees the same workspace.