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One of the reasons why Fastify is faster than Express is its use of fast-json-stringify. fast-json-stringify is a library developed by the Fastify team that boosts JSON conversion speed by analyzing JSON schema definitions.
See the stackblitz demo.
By using the fast-json-stringify library, Fastify can serialize JSON much faster than Express, contributing to its overall performance advantage.
With express-fast-json-stringify, you can leverage fast-json-stringify in your Express application
https://www.npmjs.com/package/express-fast-json-stringify
https://github.com/nigrosimone/express-fast-json-stringify