backend — FixDevs

Fix: Fastify Not Working — 404, Plugin Encapsulation, and Schema Validation Errors

FixDevs — Mon, 06 Apr 2026 00:00:00 GMT

How to fix Fastify issues — route 404 from plugin encapsulation, reply already sent, FST_ERR_VALIDATION, request.body undefined, @fastify/cors, hooks not running, and TypeScript type inference.

Fix: Kafka Consumer Not Receiving Messages, Connection Refused, and Rebalancing Errors

FixDevs — Mon, 06 Apr 2026 00:00:00 GMT

How to fix Apache Kafka issues — consumer not receiving messages, auto.offset.reset, Docker advertised.listeners, max.poll.interval.ms rebalancing, MessageSizeTooLargeException, and KafkaJS errors.

Fix: Better Auth Not Working — Login Failing, Session Null, or OAuth Callback Error

FixDevs — Sun, 29 Mar 2026 00:00:00 GMT

How to fix Better Auth issues — server and client setup, email/password and OAuth providers, session management, middleware protection, database adapters, and plugin configuration.

Fix: BullMQ Not Working — Jobs Not Processing, Workers Not Starting, or Redis Connection Failing

FixDevs — Sun, 29 Mar 2026 00:00:00 GMT

How to fix BullMQ issues — queue and worker setup, Redis connection, job scheduling, retry strategies, concurrency, rate limiting, event listeners, and dashboard monitoring.

Fix: GraphQL Yoga Not Working — Schema Errors, Resolvers Not Executing, or Subscriptions Failing

FixDevs — Sun, 29 Mar 2026 00:00:00 GMT

How to fix GraphQL Yoga issues — schema definition, resolver patterns, context and authentication, file uploads, subscriptions with SSE, error handling, and Next.js integration.

Fix: LangChain.js Not Working — Chain Not Executing, Retriever Returning Empty, or Memory Lost Between Calls

FixDevs — Sun, 29 Mar 2026 00:00:00 GMT

How to fix LangChain.js issues — model setup, prompt templates, RAG with vector stores, conversational memory, structured output, tool agents, and streaming with LangChain Expression Language.

Fix: next-safe-action Not Working — Action Not Executing, Validation Errors Missing, or Type Errors

FixDevs — Sun, 29 Mar 2026 00:00:00 GMT

How to fix next-safe-action issues — action client setup, Zod schema validation, useAction and useOptimisticAction hooks, middleware, error handling, and authorization patterns.

Fix: pdf-lib Not Working — PDF Not Generating, Fonts Not Embedding, or Pages Blank

FixDevs — Sun, 29 Mar 2026 00:00:00 GMT

How to fix pdf-lib issues — creating PDFs from scratch, modifying existing PDFs, embedding fonts and images, form filling, merging documents, and browser and Node.js usage.

Fix: Pothos Not Working — Types Not Resolving, Plugin Errors, or Prisma Integration Failing

FixDevs — Sun, 29 Mar 2026 00:00:00 GMT

How to fix Pothos GraphQL schema builder issues — type-safe schema definition, object and input types, Prisma plugin, relay connections, auth scope plugin, and schema printing.

Fix: Pusher Not Working — Events Not Received, Channel Auth Failing, or Connection Dropping

FixDevs — Sun, 29 Mar 2026 00:00:00 GMT

How to fix Pusher real-time issues — client and server setup, channel types, presence channels, authentication endpoints, event binding, connection management, and React integration.

Fix: Sharp Not Working — Installation Failing, Image Not Processing, or Build Errors on Deploy

FixDevs — Sun, 29 Mar 2026 00:00:00 GMT

How to fix Sharp image processing issues — native binary installation, resize and convert operations, Next.js image optimization, Docker setup, serverless deployment, and common platform errors.

Fix: Stripe Integration Not Working — Checkout Failing, Webhooks Not Firing, or Subscriptions Not Updating

FixDevs — Sun, 29 Mar 2026 00:00:00 GMT

How to fix Stripe issues in Node.js and Next.js — Checkout Sessions, webhook signature verification, subscription lifecycle, customer portal, price management, and idempotent API calls.

Fix: Supertest Not Working — Requests Not Sending, Server Not Closing, or Assertions Failing

FixDevs — Sun, 29 Mar 2026 00:00:00 GMT

How to fix Supertest HTTP testing issues — Express and Fastify setup, async test patterns, authentication headers, file uploads, JSON body assertions, and Vitest/Jest integration.

Fix: Trigger.dev Not Working — Tasks Not Running, Runs Failing, or Dev Server Not Connecting

FixDevs — Sun, 29 Mar 2026 00:00:00 GMT

How to fix Trigger.dev issues — task definition and triggering, dev server setup, scheduled tasks with cron, concurrency and queues, retries, idempotency, and deployment to Trigger.dev Cloud.

Fix: ts-rest Not Working — Contract Types Not Matching, Client Requests Failing, or Server Validation Errors

FixDevs — Sun, 29 Mar 2026 00:00:00 GMT

How to fix ts-rest issues — contract definition, type-safe client and server setup, Zod validation, Next.js App Router integration, error handling, and OpenAPI generation.

Fix: Auth.js (NextAuth) Not Working — Session Null, OAuth Callback Error, or CSRF Token Mismatch

FixDevs — Sat, 28 Mar 2026 00:00:00 GMT

How to fix Auth.js and NextAuth.js issues — OAuth provider setup, session handling in App Router and Pages Router, JWT vs database sessions, middleware protection, and credential provider configuration.

Fix: Effect (effect-ts) Not Working — Effect Not Running, Services Missing, or Type Errors

FixDevs — Sat, 28 Mar 2026 00:00:00 GMT

How to fix Effect issues — running effects with Effect.runPromise, Layer and service dependency injection, error channel types, Fiber concurrency, Schema validation, and common TypeScript errors.

Fix: Inngest Not Working — Functions Not Triggering, Steps Failing, or Events Not Received

FixDevs — Sat, 28 Mar 2026 00:00:00 GMT

How to fix Inngest issues — function and event setup, step orchestration, retries and error handling, cron scheduling, concurrency control, fan-out patterns, and local development with the Dev Server.

Fix: jose JWT Not Working — Token Verification Failing, Invalid Signature, or Key Import Errors

FixDevs — Sat, 28 Mar 2026 00:00:00 GMT

How to fix jose JWT issues — signing and verifying tokens with HS256 and RS256, JWK and JWKS key handling, token expiration, claims validation, and edge runtime compatibility.

Fix: Neon Database Not Working — Connection Timeout, Branching Errors, or Serverless Driver Issues

FixDevs — Sat, 28 Mar 2026 00:00:00 GMT

How to fix Neon Postgres issues — connection string setup, serverless HTTP driver vs TCP, database branching, connection pooling, Drizzle and Prisma integration, and cold start optimization.

Fix: Nitro Not Working — Server Routes Not Found, Middleware Not Running, or Deploy Failing

FixDevs — Sat, 28 Mar 2026 00:00:00 GMT

How to fix Nitro server engine issues — route handlers, middleware, storage with unstorage, caching, WebSocket support, deployment presets for Cloudflare Workers, Vercel, and Node.js.

Fix: Payload CMS Not Working — Collections Not Loading, Auth Failing, or Admin Panel Blank

FixDevs — Sat, 28 Mar 2026 00:00:00 GMT

How to fix Payload CMS issues — collection and global config, access control, hooks, custom fields, REST and GraphQL APIs, Next.js integration, and database adapter setup.

Fix: React Email and Resend Not Working — Emails Not Sending, Templates Not Rendering, or Styling Broken

FixDevs — Sat, 28 Mar 2026 00:00:00 GMT

How to fix React Email and Resend issues — email template components, inline styles, Resend API integration, preview server, attachments, and email client compatibility.

Fix: SST Not Working — Deploy Failing, Bindings Not Linking, or Lambda Functions Timing Out

FixDevs — Sat, 28 Mar 2026 00:00:00 GMT

How to fix SST (Serverless Stack) issues — resource configuration with sst.config.ts, linking resources to functions, local dev with sst dev, database and storage setup, and deployment troubleshooting.

Fix: Turso Not Working — Connection Refused, Queries Returning Empty, or Embedded Replicas Not Syncing

FixDevs — Sat, 28 Mar 2026 00:00:00 GMT

How to fix Turso database issues — libsql client setup, connection URLs and auth tokens, embedded replicas for local-first apps, schema migrations, Drizzle ORM integration, and edge deployment.

Fix: Upstash Not Working — Redis Commands Failing, Rate Limiter Not Blocking, or QStash Messages Lost

FixDevs — Sat, 28 Mar 2026 00:00:00 GMT

How to fix Upstash issues — Redis REST client setup, rate limiting with @upstash/ratelimit, QStash message queues, Kafka topics, Vector search, and edge runtime integration.

Fix: Wrangler Not Working — Deploy Failing, Bindings Not Found, or D1 Queries Returning Empty

FixDevs — Sat, 28 Mar 2026 00:00:00 GMT

How to fix Wrangler and Cloudflare Workers issues — wrangler.toml configuration, KV and D1 bindings, R2 storage, environment variables, local dev with Miniflare, and deployment troubleshooting.

Fix: Convex Not Working — Query Not Updating, Mutation Throwing Validation Error, or Action Timing Out

FixDevs — Fri, 27 Mar 2026 00:00:00 GMT

How to fix Convex backend issues — query/mutation/action patterns, schema validation, real-time reactivity, file storage, auth integration, and common TypeScript type errors.

Fix: date-fns Not Working — Wrong Timezone Output, Invalid Date, or Locale Not Applied

FixDevs — Fri, 27 Mar 2026 00:00:00 GMT

How to fix date-fns issues — timezone handling with date-fns-tz, parseISO vs new Date, locale import and configuration, DST edge cases, v3 ESM migration, and common format pattern mistakes.

Fix: Docker Secrets Not Working — BuildKit --secret Not Mounting, Compose Secrets Undefined, or Secret Leaking into Image

FixDevs — Fri, 27 Mar 2026 00:00:00 GMT

How to fix Docker secrets — BuildKit secret mounts in Dockerfile, docker-compose secrets config, runtime vs build-time secrets, environment variable alternatives, and verifying secrets don't leak into image layers.

Fix: Hono Not Working — Route Not Matching, Middleware Skipped, or RPC Client Type Mismatch

FixDevs — Fri, 27 Mar 2026 00:00:00 GMT

How to fix Hono framework issues — routing order, middleware chaining, Hono RPC type inference, Cloudflare Workers bindings, validator integration, and runtime compatibility.

Fix: HTMX Not Working — hx-get Request Not Firing, Swap Not Updating DOM, or Response Ignored

FixDevs — Fri, 27 Mar 2026 00:00:00 GMT

How to fix HTMX issues — attribute syntax, target and swap strategies, out-of-band swaps, event handling, CSP configuration, response headers, and debugging HTMX requests.

Fix: Kysely Not Working — Type Errors on Queries, Migration Failing, or Generated Types Not Matching Schema

FixDevs — Fri, 27 Mar 2026 00:00:00 GMT

How to fix Kysely query builder issues — database interface definition, dialect setup, type-safe joins and subqueries, migration runner, kysely-codegen for generated types, and common TypeScript errors.

Fix: Lucia Auth Not Working — Session Not Created, Middleware Rejecting Valid Sessions, or OAuth Callback Failing

FixDevs — Fri, 27 Mar 2026 00:00:00 GMT

How to fix Lucia auth issues — adapter setup, session validation in middleware, cookie configuration, OAuth provider integration, Next.js App Router setup, and Lucia v3 migration.

Fix: Nuxt Not Working — useFetch Returns Undefined, Server Route 404, or Hydration Mismatch

FixDevs — Fri, 27 Mar 2026 00:00:00 GMT

How to fix Nuxt 3 issues — useFetch vs $fetch, server routes in server/api, composable SSR rules, useAsyncData, hydration errors, and Nitro configuration problems.

Fix: Python Packaging Not Working — Build Fails, Package Not Found After Install, or PyPI Upload Errors

FixDevs — Fri, 27 Mar 2026 00:00:00 GMT

How to fix Python packaging issues — pyproject.toml setup, build backends (setuptools/hatchling/flit), wheel vs sdist, editable installs, package discovery, and twine upload to PyPI.

Fix: Remix Not Working — Loader Returns Undefined, Action Not Triggered, or Nested Route Data Missing

FixDevs — Fri, 27 Mar 2026 00:00:00 GMT

How to fix Remix issues — loader and action setup, nested route outlet, useLoaderData typing, error boundaries, defer with Await, and common React Router v7 migration problems.

Fix: Supabase Not Working — RLS Policy Blocking Queries, Realtime Not Receiving Updates, or Auth Session Lost

FixDevs — Fri, 27 Mar 2026 00:00:00 GMT

How to fix Supabase issues — Row Level Security policies, realtime subscriptions, storage permissions, auth session with Next.js, edge functions, and common client configuration mistakes.

Fix: SvelteKit Not Working — load Function Errors, Form Actions Failing, or SSR Data Not Available

FixDevs — Fri, 27 Mar 2026 00:00:00 GMT

How to fix SvelteKit issues — load function data flow, +page.server.ts vs +page.ts, form actions with use:enhance, hooks.server.ts, SSR vs CSR mode, and common routing mistakes.

Fix: Swift async/await Not Working — Task Not Running, Actor Isolation Error, or MainActor Crash

FixDevs — Fri, 27 Mar 2026 00:00:00 GMT

How to fix Swift concurrency issues — async/await in non-async context, Task creation, actor isolation violations, MainActor UI updates, structured concurrency, and Sendable errors.

Fix: AWS Lambda Layer Not Working — Module Not Found or Layer Not Applied

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix AWS Lambda Layer issues — directory structure, runtime compatibility, layer ARN configuration, dependency conflicts, size limits, and container image alternatives.

Fix: AWS SQS Not Working — Messages Not Received, Duplicate Processing, or DLQ Filling Up

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix AWS SQS issues — visibility timeout, message not delivered, duplicate messages, Dead Letter Queue configuration, FIFO queue ordering, and Lambda trigger problems.

Fix: Bun Not Working — Node.js Module Incompatible, Native Addon Fails, or bun test Errors

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Bun runtime issues — Node.js API compatibility, native addons (node-gyp), Bun.serve vs Node http, bun test differences from Jest, and common package incompatibilities.

Fix: Celery Beat Not Working — Scheduled Tasks Not Running or Beat Not Starting

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Celery Beat issues — beat scheduler not starting, tasks not executing on schedule, timezone configuration, database scheduler, and running beat with workers.

Fix: Docker Compose Healthcheck Not Working — depends_on Not Waiting or Always Unhealthy

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Docker Compose healthcheck issues — depends_on condition service_healthy, healthcheck command syntax, start_period, custom health scripts, and debugging unhealthy containers.

Fix: Drizzle ORM Not Working — Schema Out of Sync, Relation Query Fails, or Migration Error

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Drizzle ORM issues — schema definition, drizzle-kit push vs migrate, relation queries with, transactions, type inference, and common PostgreSQL/MySQL configuration problems.

Fix: Express Middleware Not Working — Order Wrong, Errors Not Caught, or async Errors Silently Dropped

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Express middleware issues — middleware execution order, error-handling middleware signature, async error propagation with next(err), and common middleware misconfigurations.

Fix: Go Test Not Working — Tests Not Running, Failing Unexpectedly, or Coverage Not Collected

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Go testing issues — test function naming, table-driven tests, t.Run subtests, httptest, testify assertions, and common go test flag errors.

Fix: gRPC Error Not Working — Status Codes, Connection Failed, or Deadline Exceeded

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix gRPC errors — UNAVAILABLE connection errors, DEADLINE_EXCEEDED, UNIMPLEMENTED, TLS setup, interceptors for error handling, and status code mapping.

Fix: Java Record Not Working — Compact Constructor Error, Serialization Fails, or Cannot Extend

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Java record issues — compact constructor validation, custom accessor methods, Jackson serialization, inheritance restrictions, and when to use records vs regular classes.

Fix: Kotlin Flow Not Working — Not Collecting, StateFlow Not Updating, or Flow Cancelled Unexpectedly

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Kotlin Flow issues — cold vs hot flows, collectLatest vs collect, StateFlow and SharedFlow setup, lifecycle-aware collection in Android, and common Flow cancellation problems.

Fix: Kotlin Sealed Class Not Working — when Expression Not Exhaustive or Subclass Not Found

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Kotlin sealed class issues — when exhaustiveness, sealed interface vs class, subclass visibility, Result pattern, and sealed classes across modules.

Fix: MySQL Replication Not Working — Replica Lag, Stopped Replication, or GTID Errors

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix MySQL replication issues — SHOW REPLICA STATUS errors, relay log corruption, GTID configuration, replication lag, skipping errors, and replica promotion.

Fix: OpenTelemetry Not Working — Traces Not Appearing, Spans Missing, or Exporter Connection Refused

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix OpenTelemetry issues — SDK initialization order, auto-instrumentation setup, OTLP exporter configuration, context propagation, and missing spans in Node.js, Python, and Java.

Fix: PostgreSQL JSONB Query Not Working — Operator Errors, Wrong Results, or Slow Queries

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix PostgreSQL JSONB query issues — -> vs ->> operators, @> containment, GIN indexes, type casting, array queries, and indexing strategies for JSONB columns.

Fix: PostgreSQL Row Level Security Not Working — Policy Not Applied, All Rows Visible, or Permission Denied

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix PostgreSQL Row Level Security (RLS) issues — enabling RLS, policy expressions, BYPASSRLS role, SET ROLE, current_user vs session_user, and Supabase auth.uid() patterns.

Fix: Python contextmanager Not Working — GeneratorExit, Missing yield, or Cleanup Not Running

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Python context manager issues — @contextmanager generator, __enter__ and __exit__, exception handling inside with blocks, async context managers, and common pitfalls.

Fix: Python Protocol Not Working — Type Checker Rejects Compatible Class, runtime_checkable Fails, or Protocol Not Recognized

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Python Protocol class issues — structural subtyping vs nominal typing, runtime_checkable, Protocol inheritance, TypeVar constraints, and common mypy/pyright errors with Protocol.

Fix: Python subprocess Not Working — Output Empty, Command Not Found, or Permission Denied

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Python subprocess issues — capturing stdout/stderr, shell=True risks, Popen vs run, timeout handling, and common subprocess errors explained.

Fix: Redis Cluster Not Working — MOVED, CROSSSLOT, or Connection Errors

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Redis Cluster errors — MOVED redirects, CROSSSLOT multi-key operations, cluster-aware client setup, hash tags for key grouping, and failover handling.

Fix: Rust Error Handling Not Working — ? Operator, Custom Error Types, and thiserror/anyhow

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Rust error handling issues — the ? operator, From trait for error conversion, thiserror for custom errors, anyhow for applications, and Box pitfalls.

Fix: Spring Boot Test Not Working — ApplicationContext Fails to Load, MockMvc Returns 404, or @MockBean Not Injected

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Spring Boot test issues — @SpringBootTest vs test slices, MockMvc setup, @MockBean vs @Mock, test context caching, and common test configuration mistakes.

Fix: Spring Boot @Cacheable Not Working — Cache Miss Every Time or Stale Data

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Spring Boot @Cacheable issues — @EnableCaching missing, self-invocation bypass, key generation, TTL configuration, cache eviction, and Caffeine vs Redis setup.

Fix: tRPC Not Working — Type Inference Lost, Procedure Not Found, or Context Not Available

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix tRPC issues — router setup, type inference across packages, context injection, middleware, error handling, and common tRPC v10/v11 configuration mistakes.

Fix: Zod Validation Not Working — safeParse Returns Wrong Error, transform Breaks Type, or discriminatedUnion Fails

FixDevs — Thu, 26 Mar 2026 00:00:00 GMT

How to fix Zod schema validation issues — parse vs safeParse, transform and preprocess, refine for cross-field validation, discriminatedUnion, error formatting, and common schema mistakes.

Fix: docker-compose.override.yml Not Working — Override File Ignored or Not Merged

FixDevs — Wed, 25 Mar 2026 00:00:00 GMT

How to fix docker-compose.override.yml not being applied — file naming, merge behavior, explicit file flags, environment-specific configs, and common override pitfalls.

Fix: FastAPI BackgroundTasks Not Working — Task Not Running or Dependency Errors

FixDevs — Wed, 25 Mar 2026 00:00:00 GMT

How to fix FastAPI BackgroundTasks — task not executing, dependency injection in tasks, error handling, Celery for heavy tasks, and lifespan-managed background workers.

Fix: Go Generics Type Constraint Error — Does Not Implement or Cannot Use as Type

FixDevs — Wed, 25 Mar 2026 00:00:00 GMT

How to fix Go generics errors — type constraints, interface vs constraint, comparable, union types, type inference failures, and common generic function pitfalls.

Fix: Kubernetes HPA Not Scaling — HorizontalPodAutoscaler Shows Unknown or Doesn't Scale

FixDevs — Wed, 25 Mar 2026 00:00:00 GMT

How to fix Kubernetes HorizontalPodAutoscaler issues — metrics-server not installed, CPU requests not set, unknown metrics, scale-down delay, custom metrics, and KEDA.

Fix: MongoDB Aggregation Pipeline Not Working — Wrong Results or Empty Array

FixDevs — Wed, 25 Mar 2026 00:00:00 GMT

How to fix MongoDB aggregation pipeline issues — $lookup field matching, $unwind on missing fields, $match placement, $group _id, type mismatches, and pipeline debugging.

Fix: NestJS Swagger UI Not Showing — /api-docs Returns 404 or Blank Page

FixDevs — Wed, 25 Mar 2026 00:00:00 GMT

How to fix NestJS Swagger UI not displaying — SwaggerModule setup, DocumentBuilder, decorators not appearing, guards blocking the docs route, and Fastify vs Express differences.

Fix: Node.js Stream Error — Pipe Not Working, Backpressure, or Premature Close

FixDevs — Wed, 25 Mar 2026 00:00:00 GMT

How to fix Node.js stream issues — pipe and pipeline errors, backpressure handling, Transform streams, async iteration, error propagation, and common stream anti-patterns.

Fix: Python pathlib Not Working — Path Object Errors, Joins, and Common Pitfalls

FixDevs — Wed, 25 Mar 2026 00:00:00 GMT

How to fix Python pathlib issues — TypeError with string concatenation, path joining, glob patterns, reading files, cross-platform paths, and migrating from os.path.

Fix: Spring Data JPA Query Not Working — @Query, Derived Methods, and N+1 Problems

FixDevs — Wed, 25 Mar 2026 00:00:00 GMT

How to fix Spring Data JPA query issues — JPQL vs native SQL, derived method naming, @Modifying for updates, pagination, projections, and LazyInitializationException.

Fix: AWS Lambda Environment Variable Not Set — undefined or Missing at Runtime