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Text Template Filler
Fill named text placeholders from string variables and download the text plus a used, unused and unresolved-name report.
Plain text, JSON string variables
UTF-8 text, JSON
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Paste Template text using placeholders such as {{name}}.
- Enter Variables as a JSON object of strings, for example {"name":"Alex"}. Quote numbers if they should appear as text.
- Choose whether missing variables should reject the run or remain as unresolved placeholders.
- Select Fill template, then download filled-template.txt and template-report.json.
Examples
Hello {{name}}, reference {{reference}}. with {"name":"Alex","reference":"001"} produces Hello Alex, reference 001.
Limitations
- Each input: 1,048,576 UTF-16 code units; at most 10,000 variables and 50,000 recognized placeholder occurrences. Filled output: 5,242,880 UTF-16 code units; combined downloads: 20 MiB.
- Names start with an ASCII letter or underscore and contain up to 128 letters, digits, underscores, dots or hyphens. Dots are literal key characters; spaces or tabs around the placeholder name are allowed.
- Values must be JSON strings. No implicit number or object conversion, nested property lookup, loops, HTML rendering or recursive replacement occurs; other brace syntax remains literal.
- Names are case-sensitive. Browser textarea input normalizes pasted line endings to LF. The shared text preview is limited to 1,048,576 characters; download the complete permitted output.
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