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Code Compare

Compare two text or code versions in a Monaco diff editor with split or inline views, syntax modes, file loading, statistics, and fullscreen.

  • Free public tool
  • No sign-up for this tool
  • Processing clearly labeled
  • Instant results

Content last reviewed

332
Original
Modified

Original preview

Monaco loads only after you open the editor.

// Paste or upload your original code here
function greet(name) {
  console.log('Hello ' + name);
  return name;
}

Modified preview

Monaco loads only after you open the editor.

// Paste or upload your modified code here
function greet(name) {
  console.log(`Hello, ${name}!`);
  return name.trim();
}

Quick Start

  1. Add input

    Paste or upload original and modified text, then choose a language and view.

  2. Choose options

    22 language modes, dark/light editor, split/inline diff, swap, paste, clear, and fullscreen.

  3. Review the result

    Check the output or diagnostics, then use the available copy or download control where shown.

Examples

Representative example

This example reflects the implemented transformation or analysis.

Input

const total = price * qty;

Output

const total = price * quantity; // renamed variable

Input and output example 1

Input

const total = price * qty;

Output

const total = price * quantity; // renamed variable

About the Code Compare

Code Compare addresses a focused developer workflow without requiring a command-line setup. Compare two text or code versions in a Monaco diff editor with split or inline views, syntax modes, file loading, statistics, and fullscreen. Results update from the supplied input, making it useful for quick inspection, debugging, documentation, or test preparation.

In this tool, Code Compare: processing runs in the browser and the tool does not call an external conversion API. Input remains in page memory unless a confirmed browser feature such as file reading or local settings is described above.

How to Use Code Compare

  1. Paste or upload original and modified text, then choose a language and view.

  2. Configure 22 language modes, dark/light editor, split/inline diff, swap, paste, clear, and fullscreen.

  3. Review the generated output, status, or validation message.

  4. Copy or download the result when that control is available, and verify it in the destination where it will be used.

Key Features

  • Focused processing

    Two browser-held strings are passed to Monaco?s diff editor. Separate line statistics count added, removed, and unchanged lines using positional comparison.

  • Input guidance

    Text files and 22 syntax-display modes including JavaScript, TypeScript, Python, JSON, SQL, HTML, CSS, YAML, and plain text.

  • Immediate feedback

    Clipboard access can be denied by browser permissions; non-text files may not load meaningfully.

When to Use Code Compare

  • Application development

    Use Code Compare to prepare or inspect values while implementing a feature.

  • Fault isolation

    Run a small known input through Code Compare to distinguish formatting or syntax problems from surrounding application behavior.

  • Reviewable examples

    Create a concise const total = price * quantity; // renamed variable for tests, documentation, or code review.

How It Works

Processing flow

Two browser-held strings are passed to Monaco?s diff editor. Separate line statistics count added, removed, and unchanged lines using positional comparison.

Result handling

During processing, Code Compare: the result is rendered directly in the tool interface. Validation failures are displayed instead of being silently treated as successful output.

Supported Formats and Options

Formats

  • Accepted input

    Text files and 22 syntax-display modes including JavaScript, TypeScript, Python, JSON, SQL, HTML, CSS, YAML, and plain text

  • Displayed output

    const total = price * quantity; // renamed variable

Options

  • Available controls

    22 language modes, dark/light editor, split/inline diff, swap, paste, clear, and fullscreen

Common Errors and Troubleshooting

Common errors

  • Invalid or incomplete input

    Clipboard access can be denied by browser permissions; non-text files may not load meaningfully.

  • Unexpected result

    Confirm that the selected mode or syntax matches the source and that the input is complete.

Troubleshooting guide

Resolve the reported error

Clipboard access can be denied by browser permissions; non-text files may not load meaningfully. Reduce the input to the smallest failing case and confirm the selected controls.

Check an unexpected result

Review the documented limitation for Code Compare, then compare a known example with the same mode or syntax before processing a larger value.

Limitations and Important Notes

Language selection controls highlighting, not compilation. The summary statistics are line-position based and are simpler than Monaco?s visual diff algorithm.

Privacy and Data Processing

Pasted code and text files are read in the browser and passed to the locally loaded diff editor. The component does not submit either version to a comparison API.

Tips and Best Practices

Practical tips

  • Keep the original text files and 22 syntax-display modes including javascript, typescript, python, json, sql, html, css, yaml, and plain text before using Code Compare.

  • Exercise the error case described as: Clipboard access can be denied by browser permissions; non-text files may not load meaningfully.

  • Check the result against this limitation: Language selection controls highlighting, not compilation. The summary statistics are line-position based and are simpler than Monaco?s visual diff algorithm.

Best practices

Prepare a representative input

Start with a small value whose expected result you understand, then add the edge cases relevant to Code Compare. Preserve the original when the conversion or formatting is destructive.

Verify in context

Language selection controls highlighting, not compilation. The summary statistics are line-position based and are simpler than Monaco?s visual diff algorithm. Treat the displayed result as an intermediate artifact and test it in the runtime, parser, database, or document where it will actually be used.

Technical Details

Implementation note: Code Compare: two browser-held strings are passed to Monaco?s diff editor. Separate line statistics count added, removed, and unchanged lines using positional comparison.

Who Is This For?

Developers, QA engineers, technical writers, analysts, and students who need compare two text or code versions in a Monaco diff editor with split or inline views, syntax modes, file loading, statistics, and fullscreen.

Frequently Asked Questions

Does Code Compare send input to an API?

No external processing API is used by this tool; its implemented operation runs in the browser.

What input is supported?

Text files and 22 syntax-display modes including JavaScript, TypeScript, Python, JSON, SQL, HTML, CSS, YAML, and plain text.

Why did the tool show an error?

Clipboard access can be denied by browser permissions; non-text files may not load meaningfully.

What should I verify before using the result?

Language selection controls highlighting, not compilation. The summary statistics are line-position based and are simpler than Monaco?s visual diff algorithm.

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