# Vercel Flags now supports JSON values

By Steven Van · 2026-05-07

A single Vercel Flags entry can now hold a JSON object, replacing sets of related flags like model, temperature, and max tokens.

[Vercel](<https://creatorstoolbox.com/tools/vercel>) Flags now [supports JSON values](<https://vercel.com/docs/flags/vercel-flags>), extending the existing support for booleans, strings, and numbers. That lets several related flags collapse into one: an A/B test that used to need separate *ai\_model*, *ai\_temperature*, and *ai\_max\_tokens* flags can now be a single flag whose variants each hold a full JSON object, for example a model id, temperature, max tokens, and system prompt together.

Vercel points to this for progressively routing traffic to a new model, running A/B tests between model configurations, or switching models quickly if a provider has issues.

![Flags in Vercel Dashboard](<https://7nyt0uhk7sse4zvn.public.blob.vercel-storage.com/docs-assets/static/docs/flags/flags-tab-light.png>)

Flags in Vercel Dashboard

![Flags in Vercel Dashboard](<https://7nyt0uhk7sse4zvn.public.blob.vercel-storage.com/docs-assets/static/docs/flags/flags-tab-dark.png>)

Flags in Vercel Dashboard

![Vercel](<https://www.google.com/s2/favicons?domain=vercel.com&sz=128>)

Vercel

The platform for frontend developers — deploy, preview, and scale web apps and AI agents with zero config.

[View Vercel →](<https://creatorstoolbox.com/tools/vercel>)

Sources

[Original source](<https://vercel.com/docs/flags/vercel-flags>)

[Read Vercel Flags now supports JSON values on Creators Toolbox](<https://creatorstoolbox.com/blog/vercel-vercel-flags-now-supports-json-values>)

---
Canonical source: https://creatorstoolbox.com/blog/vercel-vercel-flags-now-supports-json-values