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ESLint error/warning @typescript-eslint/no-misused-promises when passing async returning handler hook in Fastify route parameter

Status: Open.

#6513 In fastify/fastify;

· segevfiner opened on Feb 19, 2026

routerOptions cannot be reused across multiple fastify instances

Status: Open.

#6512 In fastify/fastify;

· barbeque-squared opened on Feb 19, 2026

Fastify v6: Remove fast-json-stringify and enable response validation via Ajv

Status: Open.

#6507 In fastify/fastify;

· mcollina opened on Feb 14, 2026

Question: harden request.hostname/request.host parsing?

Status: Open.

#6477 In fastify/fastify;

· mcollina opened on Jan 31, 2026

Become Railway open-source partner?

Status: Open.

#6473 In fastify/fastify;

· smith558 opened on Jan 30, 2026

Grab ReplyType from the reply parameters in a route function

Status: Open.

#6469 In fastify/fastify;

· segevfiner opened on Jan 28, 2026

Closure of HackerOne

documentationImprovements or additions to documentationImprovements or additions to documentation

notable-changeA change that should be explicitly outlined in release notes and migration guidesA change that should be explicitly outlined in release notes and migration guides

Status: Open.

#6468 In fastify/fastify;

· mcollina opened on Jan 28, 2026

Improve schema compilation time when getSchema is used

Status: Open.

#6454 In fastify/fastify;

· Eomm opened on Jan 17, 2026

Validation of optional, nullable number where property value is <code>0</code> will default to <code>null</code>

documentationImprovements or additions to documentationImprovements or additions to documentation

good first issueGood for newcomersGood for newcomers

Status: Open.

#6411 In fastify/fastify;

· cmcnicholas opened on Dec 10, 2025

Unknown or any in nested body schema property makes entire body become unknown

Status: Open.

#6401 In fastify/fastify;

· LBBO opened on Dec 2, 2025

Stream not starting on integration with renderToPipeableStream, needs to be triggered manually with fastify reply.raw.write

Status: Open.

#6358 In fastify/fastify;

· rishii95 opened on Oct 10, 2025

Cleaning the code base

Status: Open.

#6329 In fastify/fastify;

· jean-michelet opened on Sep 23, 2025