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Prompt Template Builder

Build AI prompt templates with variables, live preview, and export to JSON/YAML

Prompt Template Builder

509 chars7 variables7/7 filled
TemplateUse {{variable_name}} for placeholders
Live preview
Review the following TypeScript code from the my-project project. Focus areas: security, performance, readability Severity threshold: warning ## Code ```TypeScript // paste your code here ``` ## Context This code is part of the core module. The recent change was: refactored the authentication flow. Please provide: 1. Critical issues (bugs, security vulnerabilities) 2. Performance concerns 3. Code style and readability suggestions 4. Test coverage recommendations Rate overall code quality from 1-10 and explain your rating.
Output
Review the following TypeScript code from the my-project project.

Focus areas: security, performance, readability
Severity threshold: warning

## Code

```TypeScript
// paste your code here
```

## Context

This code is part of the core module. The recent change was: refactored the authentication flow.

Please provide:
1. Critical issues (bugs, security vulnerabilities)
2. Performance concerns
3. Code style and readability suggestions
4. Test coverage recommendations

Rate overall code quality from 1-10 and explain your rating.
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Updated . Provided as is. Check the output before you rely on it in production.

How to use Prompt Template Builder

  1. 1

    Define variables

    Identify parts of your prompt that change between uses. Mark them as {{variable_name}}. Examples: {{user_name}}, {{product_type}}, {{tone}}, {{language}}.

  2. 2

    Write the template

    Create the prompt with variable placeholders. Structure it clearly: context first, instructions second, example input/output third. Make instructions specific and unambiguous.

  3. 3

    Provide variable descriptions

    For each variable, add a note about what it expects: 'user_name: Person's first name', 'tone: professional, casual, or humorous', 'language: ISO 639-1 code'. This helps when others use the template.

  4. 4

    Test with sample values

    Fill in all variables with realistic test data and run the resulting prompt. Iterate on the wording until outputs are consistent and high-quality.

Questions and answers

What is Prompt Template Builder?
A prompt template is a reusable prompt with {{placeholders}} that your code fills in at run time. This builder detects placeholders as you type, lets you set sample and default values, previews the filled prompt, outputs plain text, JSON or YAML, and saves or loads templates as JSON files.
Does Prompt Template Builder store or send my data?
No. All processing happens entirely in your browser. Your prompts and templates stay on your device — nothing is sent to any server.
What export formats does Prompt Template Builder support?
You can export your prompt templates as JSON or YAML, making them easy to integrate into LangChain, custom Python scripts, Node.js apps, or any AI pipeline that uses templated prompts.
For AI agents: how to call this tool

Machine-readable contract, endpoints and examples. Humans can ignore this section.

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/prompt-template-builder/

For automation planning, fetch the canonical contract at /api/tool/prompt-template-builder.json.