User repository on GitHub
Left-pad strings with TypeSafe AI's Jev. For reasons.
- Forks
- 5
- Last pushed
- Updated Sep 2026
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Jev directory
CommunityJev Cookbooks
Jev Leftpad
A joke npm package that left-pads a string by asking Jev to choose among space_0 through space_10 in one Choice, spending a model call where padStart() would do.
- Stars
- 84
- Language
- JavaScript
- License
- MIT
- Reading time
- 2 min
- Published by
- Community
- Author
- f
- Last verified
- Sep 2026
About this project
Left pad a value with Jev. Could this be one line with padStart()? Yes. Does it need a model call? No. Anyway: Set TYPESAFEAPIKEY before using it. jev-leftpad uses jev-latest through TypeSafe's native @typesafe-ai/sdk. It requires Node.js 20 or newer. targetLength must be a non-negative safe integer.
Quoted from the project's README. Read the full README.
Works forJev for Classification
Used inJev for Software & DevTools
Highlights
- Each call sends one Choice with criteria named space_0 through space_10; JavaScript then creates the chosen number of spaces.
- It can add between 0 and 10 spaces only, and the README notes Jev has no correct option beyond ten.
- One TypeSafe API request per call with retries disabled; the README says not to use it in production or anything important.
- Uses jev-latest through the official @typesafe-ai/sdk and requires Node.js 20 or newer and TYPESAFE_API_KEY.
Quickstart
ts
import leftPad from 'jev-leftpad';
const result = await leftPad('jev', 8);
console.log(JSON.stringify(result));Watch out
MIT-licensed. Needs Node.js 20+ and TYPESAFE_API_KEY, makes a paid API request per call, and is explicitly a joke package.
Questions about this entry
Short answers drawn from the linked project or page.
You should not, and the README opens by saying so: padStart() is one line and needs no model call. The package exists to demonstrate the shape — code builds candidates, Jev picks one. It sends a single Choice whose criteria are named space_0 through space_10, and JavaScript creates that many spaces.
It can only add between 0 and 10 spaces; beyond ten Jev has no correct option. Each call makes one paid TypeSafe request with retries disabled, the request can fail, and the model can choose the wrong option. The README says not to use it in production or anything important.
Yes, which the README's own example admits: the result is printed as ' jev' (probably). Nothing validates the model's pick or falls back to padStart, so a wrong option produces a wrong-length string rather than an error.
No. The tests mock Jev, so they need neither a key nor any TypeSafe credits. Using the package itself requires TYPESAFE_API_KEY, Node.js 20 or newer, and jev-latest through the official @typesafe-ai/sdk.
`npm install jev-leftpad`, then `import leftPad from 'jev-leftpad'` and `await leftPad('jev', 8)`. It requires Node.js 20 or newer and TYPESAFE_API_KEY, and it uses jev-latest through TypeSafe's native @typesafe-ai/sdk.
Ten. Jev gets one Choice with criteria named space_0 through space_10, so if more than ten spaces are needed there is no correct option. For 'jev' padded to length 8 it should choose space_5.
MIT. targetLength must be a non-negative safe integer; JavaScript reads Jev's chosen number, creates that many spaces, and puts the value after them.
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