String Interpolation Tester
String Interpolation Tester
Test Handlebars/Mustache template strings with a live JSON context — variables, conditionals, and loops.
Render template strings with a live JSON context — supports Handlebars/Mustache, Jinja/Twig, and Liquid syntax (including Liquid filters like | upcase, | truncate: 10, | join: ", ").
String Interpolation Tester
Test Handlebars/Mustache template strings with a live JSON context — variables, conditionals, and loops.
Common uses
- Preview a Handlebars email template with test data
- Test a Mustache #if conditional block
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Frequently asked questions
How do I test a Handlebars template with JSON data?
Enter the template and a JSON context object and the rendered output updates live.
Which template syntaxes can I try?
Handlebars/Mustache, Jinja-style (via Nunjucks) and Liquid, including Liquid filters such as upcase and truncate. Switch between them with the dropdown above the output.
Can I preview an email template?
Yes, paste the template and sample JSON data to see the rendered text result.
Is my data uploaded to a server?
No. This tool runs entirely in your browser — your input is processed locally on your device and is never uploaded or stored on a server.