TypeScript Formatter
Format & beautify TypeScript with Prettier — live, with precise code-frame errors and before/after stats.
About this ToolHow it works, benefits & use casesTap to collapse
The TypeScript Formatter beautifies TypeScript code using Prettier running directly in your browser. Paste a file or snippet — interfaces, type aliases, generics, async functions, decorators — and it reformats with Prettier's TypeScript parser, applying consistent indentation, line wrapping, and quote and semicolon style. The formatting options mirror Prettier's own: set the print width (the column at which lines wrap), the tab width, whether to use single quotes, whether to keep semicolons, and the trailing-comma style (none, ES5, or all). Output updates live as you type or change a setting. When the code cannot be parsed, you get a precise code-frame error with the message, line, and column and a caret pointing at the syntax problem. A footer shows before/after stats — input versus output line counts and byte sizes — and a banner appears when your code is already formatted. Copy the result or download it as a .ts file. It is free and fully local.
How to Use
- 1Paste your TypeScript into the input panel, or click "Load example" to load an unformatted sample.
- 2Adjust Options if needed: print width, tab width, trailing-comma style, single quotes, and semicolons.
- 3The formatted code renders live; click "Format TypeScript" to confirm.
- 4If parsing fails, read the code-frame error showing the message, line, column, and a caret at the issue.
- 5Copy the formatted code or download it as formatted.ts; the footer shows the line and byte change.
Key Benefits
- Formats TypeScript with Prettier, including interfaces, generics, and decorators
- Configurable print width, tab width, quotes, semicolons, and trailing commas
- Live reformatting as you type or change an option
- Precise code-frame error with line:column and a caret on parse failures
- Before/after stats: input vs output line counts and byte sizes
- "Already formatted" banner when no changes are needed
- Runs entirely in the browser — code is never uploaded; copy or download as .ts
Common Use Cases
- Tidying up a TypeScript snippet pasted from a Slack message or issue
- Applying Prettier formatting without a local toolchain or editor plugin
- Checking whether a file is already Prettier-clean before committing
- Experimenting with print-width or trailing-comma settings to match a project style
- Reformatting generated or minified TypeScript into readable code
Options
0 characters · live
Paste TypeScript above to format it live.
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You can set the print width (the wrap column, 20–200), the tab width (1–8 spaces), the trailing-comma style (none, ES5, or all), and toggle single quotes and semicolons. These map directly to Prettier’s options, so the output matches what Prettier would produce with the same configuration.
Yes. It loads Prettier’s standalone build along with the estree, babel, and TypeScript parser plugins and runs them in your browser. The result is identical to running Prettier locally with the TypeScript parser, so it understands modern TypeScript syntax including type-only constructs.