Template Placeholder Filler
Fill template placeholders like {{name}} and {{email}} with values from a key=value list or JSON object.
About the Template Placeholder Filler
Fill a text template by replacing exact {{placeholder}} names with values. Supply one key=value pair per line, or choose JSON and paste a flat object. For example, Hello {{name}} with name=Sam produces Hello Sam. Replacement values are inserted literally, including dollar signs, and missing keys remain unchanged. JSON string values can contain escaped line breaks. Nested objects and recursive expansion of placeholders inside values are not supported.
Features
- Exact, case-sensitive placeholder names
- One key=value pair per line
- Flat JSON objects, including escaped newlines in string values
- Literal value insertion
- Unmatched placeholders remain visible
- Invalid JSON feedback
How to use this tool
The Template Placeholder Filler works right in your browser — no signup, no installation. Follow these steps:
- Paste your template with {{placeholders}} into the template area.
- Enter values as name=value (one per line) or paste JSON.
- View the filled result updating in real time.
- Copy the completed template.
Frequently asked questions
Can placeholder names contain punctuation?
Yes. Names are matched literally and case-sensitively, so {{user.name}} can match a flat key named user.name. It does not look up a nested user object.
How do I use a multiline value?
Choose JSON mode and use a string with escaped newline characters. In key=value mode each line defines a separate value.
What happens to missing placeholders?
They remain unchanged in the output so you can see which values still need to be supplied.
Using the results
Bulk text edits that would take ages by hand happen in one step with the Template Placeholder Filler. It applies your changes the moment you make them, entirely in the browser, so your content stays on your device and the result is ready to copy immediately.