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Free Online AST Viewer

In-browser processing

AST Viewer helps you view AST in a structured, readable layout while preserving the source for comparison and highlighting unsupported or malformed content directly in the browser where supported. Start with the built-in example, test valid and malformed input, review every warning, and verify the final result in the system that will consume it.

AST Viewer provides a free online workflow with normal processing in the browser, helping keep working data out of unrelated third-party services.
What this tool does

AST Viewer helps you view AST in a structured, readable layout while preserving the source for comparison and highlighting unsupported or malformed content directly in the browser where supported.

1 Add or choose your input 2 Use the highlighted action 3 Copy or download the result
Loading interactive AST Viewer workspace…
Help, examples, and technical details for AST ViewerFull documentation, steps, and compatibility notes

What is AST Viewer?

AST Viewer is a deterministic code formatting, linting, and transformation tools utility. It is designed to inspect or explain input using explicit rules, standards, templates, parsers, calculations, or user-selected options rather than generative AI.

How to use AST Viewer

  • Enter, paste, upload, or select the required input.
  • Review any options before running the primary action.
  • Inspect the result and validation messages without losing the original input.
  • Copy or download the output, then verify it in the target system.

Inputs, outputs, and verification

The workspace accepts formats relevant to ast viewer, preserves the original material in a separate pane, and produces reviewable output. Standards-sensitive results should be tested against the runtime, provider, protocol, or policy that will consume them.

Privacy, safety, and operational limits

This operation normally runs locally in the browser and does not upload the working input. Browser memory and API support still limit very large files or uncommon formats.

Supported formats

UTF-8 textJSON when applicable

Keyboard shortcuts

Ctrl/Cmd + EnterRun the primary action
Ctrl/Cmd + LLoad a tool-specific example
Ctrl/Cmd + Shift + CCopy the output
Frequently asked questions

AST Viewer FAQ

Does AST Viewer use AI?

No. AST Viewer uses deterministic rules, standards, templates, parsers, calculations, random or seeded values, or conventional APIs as appropriate.

Is AST Viewer private?

Yes for the normal operation: processing happens in the browser. Copy, download, account, sharing, or live-network actions are separate and user initiated.

How should I verify AST Viewer output?

Compare the result with the destination system, official specification, provider documentation, or a known test case. A successful transformation does not replace environment-specific validation.

Is AST Viewer free to use?

Yes. AST Viewer is available as a free online developer tool. A protected provider or live-network requirement is shown before a server-assisted operation runs.

How should I verify the AST Viewer output?

Run a known-good example, an invalid example, and a boundary case. Then validate AST Viewer output in the exact application, runtime, format version, or provider that will consume it.

Supporting documentation

Related guides