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TypeScript Online Compiler

Write TypeScript, press Run — compiled to JavaScript and executed in your browser.

  • Free
  • No signup
  • Nothing uploaded
  • No watermark

Source

10 lines
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Program output

463 B
Ctrl+Enter · TypeScript · runs in your browser

Press Run to execute the program. Output appears here.

Read in this tab. Nothing you paste or open is ever uploaded.

How to Use the TypeScript Online Compiler Online

TypeScript Online Compiler: before and after TS A BEFORE TYPESCRIPTONLINECOMPILER TS A AFTER

Compiles TypeScript to JavaScript in your browser and runs it, so a snippet with interfaces, generics or enums can be tried without installing anything. The types are stripped in the tab in a way that leaves every line where it was, so a runtime error still points at the line you wrote. This is a runner rather than a checker: it answers "what does this program do", not "does it type-check" — a wrong annotation will not stop the run, but a syntax error is reported with its line. The program executes in a sandboxed worker with prompt() and readline() asking in the output pane, console output beside the code, and an eight-second limit on runaway loops. Nothing leaves the browser; there is no queue, account or server.

No software to install Free Works on any device

Step-by-Step Guide to Using the TypeScript Online Compiler

  1. 1. Write or paste your program on the left — a working example is loaded to start from

  2. 2. Press Run (or Ctrl+Enter)

    When the program asks for input, the question appears in the output with a box — type the answer and press Enter, and it carries on.

  3. 3. Output appears beside the code

    errors name the line. Fix, run again, and Download the file when it is right.

Try it now

What is the TypeScript Online Compiler?

Compiles TypeScript to JavaScript in your browser and runs it, so a snippet with interfaces, generics or enums can be tried without installing anything. The types are stripped in the tab in a way that leaves every line where it was, so a runtime error still points at the line you wrote. This is a runner rather than a checker: it answers "what does this program do", not "does it type-check" — a wrong annotation will not stop the run, but a syntax error is reported with its line. The program executes in a sandboxed worker with prompt() and readline() asking in the output pane, console output beside the code, and an eight-second limit on runaway loops. Nothing leaves the browser; there is no queue, account or server.

TS files

.TS .TSX .MTS

Write TypeScript, press Run — compiled to JavaScript and executed in your browser.

Why Use an Online File Viewer?

Not every computer has the right program for a YAML, VCF, SRT or log file, and installing one just to look inside is a chore. A viewer opens the file in your browser and shows it neatly next to its source text.

“Sometimes you just need to see what is inside the file.”
  • No software to install
  • Data laid out as tables
  • Subtitles shown with timings
  • Code tried out in the page
  • Colour-coded source text
  • Contacts and calendars readable
  • Works on shared computers
  • Private files stay local

Popular Uses for Code and Data Viewers

People open these when a file arrives and nothing on the computer will show it.

  • Checking a JSON response Open a JSON or YAML file as a readable tree instead of one long line.
  • Reading contact backups See the names and numbers inside a VCF file exported from a phone.
  • Opening calendar invites Read the date, time and place in an ICS file before adding it.
  • Checking subtitles View SRT or VTT subtitles with their timings to spot a missing line.
  • Reading log files Scroll through a server or app log with the lines laid out clearly.
  • Previewing CSV and TSV Look at a data file as a table without opening a spreadsheet program.
  • Trying a code snippet Run a short Python or JavaScript example from a tutorial and see the output.
  • Viewing SVG graphics See how an SVG icon or drawing looks next to the markup behind it.

What You Can Do with the TypeScript Online Compiler

Accepts TS, TSX, MTS

Highlighting follows the language’s real grammar rather than a list of keywords

Reads a file you have not yet decided to trust, without registering a handler for it

Why Use ToolXkit for TypeScript Online Compiler?

Your files stay with you

Everything runs inside your browser. Nothing you open or type is uploaded to a server.

File Viewers for Different Users

Developers

Inspect config, env and data files on any machine without an editor installed.

Programming students

Try small programs in Python, JavaScript or SQL without setting anything up.

IT support staff

Open logs, HAR files and settings files that users send in.

Office workers

Read contact, calendar and CSV files that arrive as email attachments.

Video editors

Check subtitle files for timing and text before a video goes out.

Data analysts

Glance at CSV, TSV, JSONL and GeoJSON files before loading them anywhere.

Best Times to View a File Online

A browser viewer is handy when you are:

  • Using a borrowed or office computer
  • Opening an unfamiliar attachment
  • Checking a file before importing it
  • Learning to code without installing
  • Debugging a settings file
  • Proofreading subtitle timings
  • Looking inside a phone backup
  • Reviewing a server log

Frequently Asked Questions

Answers to common questions about this tool.

Is this real TypeScript?

The types are stripped in your browser, keeping every line where you wrote it, and the resulting JavaScript runs in a sandboxed worker. It is a runner, not a type checker: a type error will not stop the program the way tsc would, but a syntax error is reported with its line.

Which TypeScript features work?

Interfaces, type aliases, generics, enums, decorators-free classes, optional chaining, satisfies and as — anything that compiles to plain JavaScript. Import statements are not supported; keep the program in one file.

How do I give the program input?

When the program calls prompt(), readline() or input(), the question appears in the output pane with a box. Type the answer and press Enter; the run continues from there.

Does anything leave my browser?

No. The compiler and the program both run in the tab. There is no server queue and no account, and the page works offline once loaded.

Does TypeScript Online Compiler upload my file?

No. The file is read by your browser and shown on screen without being sent anywhere. Config files with passwords, contact lists and logs remain on your own computer.

Do the online compilers run real code?

Some languages, such as Python, JavaScript, TypeScript, Lua and SQL, run inside your browser. For others, the page is mainly for reading and sharing the code, so read the note on that page to know what to expect.

Does TypeScript Online Compiler cost anything or need a login?

Neither. There is no fee, no sign-up and no cap on how many files you open. It works the same on a work laptop, a home computer or a phone.

What if my file is very large?

Large logs and data files depend on your device’s memory, because the whole file is read in the browser. If a huge file feels slow, try a computer with more memory or view a smaller part of it.

Can I open a file from my phone?

Yes. Use the file picker to choose it from your phone’s storage or a downloaded attachment, and the contents appear on the page. A larger screen is easier for long files, but everything works on mobile.

Further reading

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