SelectTransform/st.js

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1223 stars · 61 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

ST (SelectTransform) is a JavaScript library that lets you query and select subtrees of any JSON object with selector functions, and transform JSON into other JSON using declarative templates written in JSON itself. Select and Transform can be combined for partial transforms and modularizing JSON structures.

Use cases

• transform one JSON payload into another shape using a JSON template
• find all key/value pairs in a JSON tree matching a filter function
• reshape API responses into a different JSON structure
• extract matching subtrees from deeply nested JSON
• generate HTML snippets from JSON data via each-loops in templates
• modularize and partially transform large JSON objects

When to choose

• you want declarative JSON-to-JSON transformation without writing imperative mapping code
• you need to query or filter nested JSON structures with custom selector functions
• you prefer templates expressed in JSON rather than a separate template language

When to avoid

• you need high-performance bulk JSON processing on large datasets
• you want JSON schema validation rather than transformation
• your project needs a actively developed library with frequent updates

Facets

library · maturity maintenance

serialization parser templating developer-tools developer-tools apis cross-platform -transformation -templating -selector data-mapping -to- data-engineering javascript nodejs

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