reverse-ejs
Turn any templated text into structured JSON. Works with HTML, Markdown, logs, emails, plain text - anything you can describe with an EJS template.
How it works
1
Grab the text
Copy the HTML page, Markdown document, log line, email, or any other templated text you want to extract data from.
2
Create a template
Replace the values you care about with EJS tags like
<%= name %>.
3
Extract the data
Paste both below and get a clean JSON object with every value extracted.
Features
- Works with any text format - HTML, Markdown, logs, emails, CSV-like data, plain text - anything you can describe with an EJS template
- Loops & nested data - extract arrays and nested objects from any repeating section
-
Conditionals - if/else, switch/case,
and boolean detection (including complex conditions like
a > b) -
JS expression capture - tags like
<%= price * qty %>or<%= name.toUpperCase() %>are captured under the raw expression text as the key - Flexible whitespace - matches pretty-printed and minified HTML against the same template
-
Type coercion - convert extracted
strings to numbers, booleans, or dates via the
typesoption -
Compiled templates -
compileTemplate()andreverseEjsAll()for fast batch extraction -
Safe mode - return
nullon no-match instead of throwing -
HTML entity unescaping -
&,<,"automatically decoded - Includes / partials - reuse template fragments across pages
- Full TypeScript types - hover docs in your editor for every option
- Zero dependencies - 20KB, runs in any browser, Node.js 20+, Bun, or Deno
- Privacy-first - the playground runs entirely in your browser, your HTML never leaves your device
Playground
Paste your rendered text and EJS template, then hit Extract.
Try an example: