Observed Signal · May 27, 2026 · Technical Release · Source: DEV Community · Impact: 2/5 · Sentiment: Positive
MJML i18n Preprocessor for Simple Translations
A developer posted an open-source MJML preprocessor, @checkthiscloud/mjml-i18n, that adds two lightweight features to MJML email templates: simple variable interpolation and co-located translations (vue-i18n style). The tool resolves {{ … }} function-call expressions (i18n and get) on the raw MJML XML before MJML parsing, allowing substitutions anywhere including attributes. It deliberately avoids full templating language features (no loops, conditionals or eval), uses a small allowlist built on jsep, falls back gracefully on missing keys/vars, and is released MIT-licensed for MJML v5 as a 0.x package. The author published usage examples and links to the npm package and GitHub repository.
Small open-source utility that simplifies translation and variable substitution in MJML email templates; useful to developers and teams working on email production but not industry-shifting.
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Key Takeaways & Evidence Grounding
- Author released an open-source package named @checkthiscloud/mjml-i18n.
- The package is an MJML preprocessor that provides variable substitution (get) and translations (i18n) evaluated before MJML parsing.
- It intentionally restricts expressions to function-call allowlist (built on jsep) and excludes loops, conditionals, and eval.
- The project is MIT-licensed, marked 0.x, and built for MJML v5; npm and GitHub repositories are provided by the author.
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