What changes in this tool
Indent simple JavaScript blocks and explicit statements. Indentation and line breaks expose structure while preserving the supported input tokens. The JavaScript formatter handles simple blocks with braces and explicit semicolons. A function written on one line becomes easier to trace. Template literals and ambiguous regular expressions are rejected because line-oriented formatting without a full parser could change their meaning.
Know the format
JavaScript source can contain strings, comments, regular expressions, template literals and constructs in which a line break matters. A small editor cannot safely infer every boundary from punctuation alone. The block formatter here handles simple brace-and-semicolon code and rejects template literals or ambiguous regular-expression syntax instead of quietly rewriting them. It is intended for short inspection snippets, not bundling application code. The separate string-escape operation treats all input as data and serializes it as one quoted literal; it does not run the text as code. In either case, copied output should be checked in the destination parser and test environment.
A dependable workflow
Formatting is most useful during review or debugging, when indentation can expose a missing nesting level or an unexpected sibling. Paste a complete, representative fragment and run the formatter once. Read the output from the outermost structure inward, paying attention to where each element, block or clause begins and ends. This page deliberately avoids pretending to be a compiler for every possible extension of the language. It may reject source whose meaning depends on advanced constructs. After copying the result, run the normal validator or test suite for the project in which it will be used. If you plan to commit the formatted text, inspect the diff so changes in layout do not hide an accidental change in a literal or data value.
Check the result
Keep the original next to the output and test a small known example before handling a large document. Compare meaningful content, not only file size or the number of lines. Check names, quoted strings, non-ASCII characters, line endings and any repeated fields after the transformation. A syntactically readable result does not validate a schema, prove that code executes, or establish that data is safe to publish. This site processes the entered text in the browser and displays the result as text, but the copy you paste into another application will follow that application’s rules. If the tool rejects an input, do not remove unexplained characters merely to get an output: identify which construct is outside the supported subset and use a dedicated parser when necessary.