NestJS docs

1.[NestJS docs] Providers

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2.[NestJS docs] Middleware

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3.[NestJS docs] Exception filters

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4.[NestJS docs] Pipes

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5.[NestJS docs] Authentication

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6.[NestJS docs] Guards

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7.[NestJS docs] Custom decorators

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8.[NestJS] Interceptors

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9.[NestJS docs] Custom providers

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10.[NestJS docs] Configuration

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