I will develop and integrate REST APIs and third-party APIs in Node/ExpressJS application
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Sold by B_tech_Innovative •B_tech_Innovative Total sales 0
Need Fast, Reliable API Integration for Your Web App?
I am a Full-Stack JavaScript Developer specializing in Node.js, Express.js, and REST APIs.
I help businesses integrate external APIs, build internal endpoints, and fix backend issues with clean, production-ready code.
Whether it is a third-party API, a new endpoint, or a broken request, I will build, integrate, debug, and deliver.
### PACKAGE
## BASIC — (€30 — 2 Days)
- One clearly defined, single-scope API task
### Includes ONE (1) of the following:
- One external API endpoint integration
(single endpoint, one-way integration only; no webhooks or background jobs)
### OR
- One internal REST API endpoint
(single endpoint, single HTTP method, single ENDPOINT)
### What is included:
- Request and response formatting
- Basic input validation (required fields and simple checks only)
- Error handling for the endpoint
- API testing (Postman or Thunder Client)
- Short explanation of the implementation
- Up to 2 revisions **within the original agreed scope**
### Important:
- API keys, tokens, or credentials must be provided by the buyer
- The task must be single-scope and clearly defined before work begins
- Revisions do not include new features, endpoints, or logic changes
- Additional endpoints, features, or scope changes require add-ons or a new order
ADD-ONS (Optional)
Add-on delivery time is added to the BASIC package delivery time.
Each add-on covers only what is explicitly listed below.
Anything not listed is excluded unless agreed in writing.
### Extra API Endpoint — €15 (+1 Day)
-Adds exactly ONE (1) additional API endpoint
## Includes:
- One internal OR one external API endpoint
- Single HTTP method
- Routing, basic validation, and testing
## Not included:
- Authentication or authorization
- Database logic
- Webhooks, callbacks, or background jobs
- Complex business rules
- Multiple endpoints or chained workflows
### Authentication Setup — €25 (+2 Days)
- Restricts access to your API so only authorized requests can use it.
- This add-on is for projects that already have working API endpoints and need to make them private instead of public.
## Includes:
- Securing existing API endpoints (applies only to endpoints explicitly delivered in this order)
- Blocking unauthorized access
- Allowing access only when valid credentials are provided
- Clear error responses when access is denied (backend fallback error only, frontend pages are not included)
## Authentication method (choose ONE):
- Token-based access (JWT)
- API key access
- Session-based access (cookies)
## NOT included:
- User registration or login pages
- User accounts, roles, or permissions
- Password handling or user management
- OAuth (Google, Facebook, etc.)
- Refresh token systems
### Important NOTES:
- This add-on secures access to endpoints; it does not manage users
- Endpoints must already exist or be created as part of this order
### PostgreSQL Database Integration — €30 (+2 Days)
- Connects API logic to an existing PostgreSQL database
## Includes:
- Database connection setup
- Queries/models for up to TWO (2) endpoints
- Basic CRUD operations
## Not included:
- Database or schema design from scratch
- Migrations, seeding, or schema changes
- Performance tuning or indexing
- More than 2 endpoints (requires another add-on)
### API Debugging & Fix — €15 (+1 Day)
- Fixes ONE (1) existing API endpoint
## Includes:
- Request/response issues
- Validation or logic bugs
- Error handling fixes
## Not included:
- New endpoint creation
- Feature additions or refactoring
- Issues caused by missing credentials or third-party outages
- Bugs spanning multiple endpoints or services
### Error Logging Setup — €10 (+1 Day)
- Improves API visibility and debugging
## Includes:
- Structured error logging (Winston or similar)
- Runtime error and request logging
## Not included:
- Monitoring dashboards
- Alerts or notifications
- Log aggregation services
- Long-term log storage or analytics
### API Documentation — €20 (+2 Days)
- Creates professional API documentation for implemented endpoints
## Includes:
- Swagger / OpenAPI setup
- Endpoint descriptions, request/response schemas, and examples
- Hosted documentation endpoint (e.g. /api-docs)
## Not included:
- Documentation for endpoints not built in this order
- Frontend, user, or business documentation
- Ongoing documentation maintenance
### Performance Optimization / Caching — €20 (+2 Days)
- Improves API performance within application scope
## Includes:
- Response optimization (cleaner, faster API responses)
- Reduced redundant processing per request
- Basic in-app caching OR Redis setup (one option)
## Not included:
- Load balancing or infrastructure changes
- Stress or load testing
- Large-scale system tuning
- Performance guarantees involving third-party APIs
### Extra Revisions (Bundle) — €25 (+3 Days)
- Covers follow-up adjustments within existing scope
## Includes:
- Up to THREE (3) small adjustments
- Changes directly related to the original task or purchased add-ons
## Not included:
- New endpoints or features
- New integrations
- Major logic changes or scope expansion
### Rate Limiting Setup — €20 (+2 Days)
- Protects API endpoints from abuse and excessive requests
## Includes:
- Rate limiting for up to TWO (2) endpoints
- IP-based or token-based limits
- Configurable request thresholds
- Proper error responses (429 status)
## Not included:
- Advanced bot detection
- Distributed rate limiting across multiple services
- DDoS protection
- Monitoring or alerting
### DO’S
- API integrations
- Custom REST endpoints
- JWT / API key auth
- Webhooks
- CRUD logic
- Backend bug fixing
- Express middleware
- Third-party services (Stripe, Paystack, Firebase, Twilio)
### DON’TS
- Illegal or unethical APIs
- Adult content APIs
- Crypto trading bots
- Frontend UI design
- Full SaaS builds from scratch
- No multi-endpoint system architecture
I am a Full-Stack JavaScript Developer specializing in Node.js, Express.js, and REST APIs.
I help businesses integrate external APIs, build internal endpoints, and fix backend issues with clean, production-ready code.
Whether it is a third-party API, a new endpoint, or a broken request, I will build, integrate, debug, and deliver.
### PACKAGE
## BASIC — (€30 — 2 Days)
- One clearly defined, single-scope API task
### Includes ONE (1) of the following:
- One external API endpoint integration
(single endpoint, one-way integration only; no webhooks or background jobs)
### OR
- One internal REST API endpoint
(single endpoint, single HTTP method, single ENDPOINT)
### What is included:
- Request and response formatting
- Basic input validation (required fields and simple checks only)
- Error handling for the endpoint
- API testing (Postman or Thunder Client)
- Short explanation of the implementation
- Up to 2 revisions **within the original agreed scope**
### Important:
- API keys, tokens, or credentials must be provided by the buyer
- The task must be single-scope and clearly defined before work begins
- Revisions do not include new features, endpoints, or logic changes
- Additional endpoints, features, or scope changes require add-ons or a new order
ADD-ONS (Optional)
Add-on delivery time is added to the BASIC package delivery time.
Each add-on covers only what is explicitly listed below.
Anything not listed is excluded unless agreed in writing.
### Extra API Endpoint — €15 (+1 Day)
-Adds exactly ONE (1) additional API endpoint
## Includes:
- One internal OR one external API endpoint
- Single HTTP method
- Routing, basic validation, and testing
## Not included:
- Authentication or authorization
- Database logic
- Webhooks, callbacks, or background jobs
- Complex business rules
- Multiple endpoints or chained workflows
### Authentication Setup — €25 (+2 Days)
- Restricts access to your API so only authorized requests can use it.
- This add-on is for projects that already have working API endpoints and need to make them private instead of public.
## Includes:
- Securing existing API endpoints (applies only to endpoints explicitly delivered in this order)
- Blocking unauthorized access
- Allowing access only when valid credentials are provided
- Clear error responses when access is denied (backend fallback error only, frontend pages are not included)
## Authentication method (choose ONE):
- Token-based access (JWT)
- API key access
- Session-based access (cookies)
## NOT included:
- User registration or login pages
- User accounts, roles, or permissions
- Password handling or user management
- OAuth (Google, Facebook, etc.)
- Refresh token systems
### Important NOTES:
- This add-on secures access to endpoints; it does not manage users
- Endpoints must already exist or be created as part of this order
### PostgreSQL Database Integration — €30 (+2 Days)
- Connects API logic to an existing PostgreSQL database
## Includes:
- Database connection setup
- Queries/models for up to TWO (2) endpoints
- Basic CRUD operations
## Not included:
- Database or schema design from scratch
- Migrations, seeding, or schema changes
- Performance tuning or indexing
- More than 2 endpoints (requires another add-on)
### API Debugging & Fix — €15 (+1 Day)
- Fixes ONE (1) existing API endpoint
## Includes:
- Request/response issues
- Validation or logic bugs
- Error handling fixes
## Not included:
- New endpoint creation
- Feature additions or refactoring
- Issues caused by missing credentials or third-party outages
- Bugs spanning multiple endpoints or services
### Error Logging Setup — €10 (+1 Day)
- Improves API visibility and debugging
## Includes:
- Structured error logging (Winston or similar)
- Runtime error and request logging
## Not included:
- Monitoring dashboards
- Alerts or notifications
- Log aggregation services
- Long-term log storage or analytics
### API Documentation — €20 (+2 Days)
- Creates professional API documentation for implemented endpoints
## Includes:
- Swagger / OpenAPI setup
- Endpoint descriptions, request/response schemas, and examples
- Hosted documentation endpoint (e.g. /api-docs)
## Not included:
- Documentation for endpoints not built in this order
- Frontend, user, or business documentation
- Ongoing documentation maintenance
### Performance Optimization / Caching — €20 (+2 Days)
- Improves API performance within application scope
## Includes:
- Response optimization (cleaner, faster API responses)
- Reduced redundant processing per request
- Basic in-app caching OR Redis setup (one option)
## Not included:
- Load balancing or infrastructure changes
- Stress or load testing
- Large-scale system tuning
- Performance guarantees involving third-party APIs
### Extra Revisions (Bundle) — €25 (+3 Days)
- Covers follow-up adjustments within existing scope
## Includes:
- Up to THREE (3) small adjustments
- Changes directly related to the original task or purchased add-ons
## Not included:
- New endpoints or features
- New integrations
- Major logic changes or scope expansion
### Rate Limiting Setup — €20 (+2 Days)
- Protects API endpoints from abuse and excessive requests
## Includes:
- Rate limiting for up to TWO (2) endpoints
- IP-based or token-based limits
- Configurable request thresholds
- Proper error responses (429 status)
## Not included:
- Advanced bot detection
- Distributed rate limiting across multiple services
- DDoS protection
- Monitoring or alerting
### DO’S
- API integrations
- Custom REST endpoints
- JWT / API key auth
- Webhooks
- CRUD logic
- Backend bug fixing
- Express middleware
- Third-party services (Stripe, Paystack, Firebase, Twilio)
### DON’TS
- Illegal or unethical APIs
- Adult content APIs
- Crypto trading bots
- Frontend UI design
- Full SaaS builds from scratch
- No multi-endpoint system architecture
-
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About the seller
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Orders in progress 0
Total sales 0
Seller since Dec 2025
I’m a Full-Stack Web Developer with a strong focus on building reliable, scalable, and user-focused web applications from end to end. I work comfortably across both frontend and backend, turning ideas into clean, functional, and maintainable products. On the backend, I design robust APIs and server logic using Node.js and Express, with experience working with both PostgreSQL and MongoDB for efficient data modeling and performance. On the frontend, I build responsive and modern interfaces using React, EJS, SCSS, and the Vite compiler, ensuring fast load times and smooth user experiences. I value: Clean, well-structured code Clear communication and realistic timelines Solutions that are secure, scalable, and easy to maintain Whether you need a full web application, backend API, database integration, or frontend improvements, I approach every project with professionalism, attention to detail, and a genuine commitment to quality. Let’s work together to build something reliable and impactful.