🟢 Featured Service

API & Microservices Testing Services

Validate your business logic at the core layer. We deliver expert functional verification, integration validation, and security testing for REST, SOAP, and GraphQL interfaces — ensuring secure data flows across your microservices ecosystem.

Get a Free API Audit → Explore Services

99.9%

API Reliability Rate

Integration Speeds

100%

Endpoint Coverage

Years of QE Expertise

Ensuring Seamless Functionality

Robust API Testing. Zero Data Leakage.

Your backend connectors, validated for speed, structure, and safety.

Modern application architectures rely heavily on APIs to connect databases, microservices, and client-side UIs. A minor structure change or code regression at the API layer can break complete user journeys. At JLD Info Tech, we provide thorough testing of your APIs to ensure they return the exact JSON/XML responses, support high concurrency rates, and resist malicious injections.

We work closely with your engineering teams to mock external components, write detailed assertion collections, and verify status codes under standard and edge cases.

Comprehensive verification of status codes, payloads, headers, and schemas
Integration of API verification collections directly into CI/CD pipelines
Advanced authentication testing (OAuth 2.0, JWT, API Keys, SAML)
Automated regression pipelines executing on every build commit
Mocking and virtualization of slow, expensive, or third-party web services
Data validations verifying storage layers are updated correctly

Begin API Audit Today → Our Methodology

Our API Testing Portfolio

End-to-End API & Microservices QA

From simple validation of REST endpoints to complex security audits and network telemetry captures, we ensure your backend operates flawlessly.

🧪

Functional & Unit Testing

We validate endpoints individually to check response structures, header accuracy, and parameter evaluations. We ensure HTTP status codes (200, 201, 400, etc.) are returned correctly under success and error inputs.

Postman Newman JSON Schema HTTP Codes

🔗

Integration Testing

We test API chaining and complete user transactions, verifying that output variables from one endpoint flow correctly as input values into the next, ensuring microservices function together seamlessly.

API Chaining Data Flows REST Assured GraphQL

💻

End-to-End Testing

We validate complete business processes across multiple system layers, testing from UI clicks to background API requests, verifying databases, and ensuring third-party webhooks are processed accurately.

E2E Journeys Webhooks QA SoapUI Mock Assertions

📄

Contract Testing

We implement consumer-driven contract checks, verifying that microservices adhere to agreed-upon API definitions. This isolates failures and ensures independent teams deploy backend changes without breaking integrations.

Pact Framework Microservices Swagger/OpenAPI Schemas

⚡

Performance & Load Testing

We push concurrency thresholds to the limit on API gateways, testing throughput limits, transaction response latencies, and verifying server nodes dynamically autoscale under load spikes.

JMeter k6 Latency Checks Concurrency

🔒

Security & Auth Testing

We execute security scans to verify authentication layers, audit CORS parameters, prevent SQLi/XSS via parameters, and validate JWT tokens, following the OWASP API Security Top 10 guidelines.

JWT Audit OAuth 2.0 OWASP Top 10 Pen Testing

Our Methodology

Strategic API QA Process

API validation requires a distinct approach compared to UI testing. We follow a systematic pipeline to capture request requirements, build clean assertions, virtualize slow networks, and integrate checks into continuous deployment cycles.

📋

Analyze Specifications

We review API specifications (Swagger, OpenAPI, RAML, WSDL) and map data flows, endpoints, input ranges, and authorization mechanisms.

📝

Assertion Scripting

We write clean validation scripts in Postman or REST Assured, asserting response times, payload values, headers, and schemas under valid and invalid inputs.

🔌

Mocking & Virtualization

We set up mocks for slow, paid, or external API dependencies, allowing functional validation of local services without calling external platforms.

⚡

Execution & Regression

We run full test collections to evaluate API resilience, data integrity across backend tables, and identify regression issues early in development.

🔄

CI/CD Integration

We integrate script collections into your build pipelines (Jenkins, GitHub Actions, GitLab CI), running automated checks on every pull request to protect code quality.

Immediate Action

Free API Specification Scan

Unsure of your API schema quality? Send us your Swagger file or a basic endpoint collection. Our QA architects will run a quick structural review and highlight obvious security gaps or schema vulnerabilities — completely free.

Request Free API Scan →

Our Tech Stack

Industry-Standard API Testing Tools

We select the right libraries and test frameworks matching your team's development ecosystem and testing requirements.

Collaborative API Development & Automation

Postman is a popular API client that supports writing JS assertion scripts. We build organized Postman collections and run them using Newman CLI in deployment pipelines for seamless test automation.

🚀

Newman CLI

⚙️

JS Scripts

📂

Collections

🔌

API Mocking

Java DSL for Easy REST Verification

REST Assured is a powerful Java library for testing and validating REST services. It supports BDD styles (Given-When-Then syntax) and integrates smoothly with JUnit or TestNG frameworks.

☕

Java DSL

🔄

JSONPath

🧪

JUnit/TestNG

⚡

BDD Style

Functional Testing of SOAP & REST Protocols

SoapUI is a robust framework for complex protocol validations. It handles SOAP and REST architectures, supports Groovy scripting, database checks, and custom assertions for legacy and modern systems.

🛡️

SOAP / WSDL

📂

XML Assertions

⚙️

Groovy Scripting

🗄️

JDBC Queries

Audits for Authentication & CORS Policies

API security testing ensures data protection. We utilize tools like OWASP ZAP and custom proxy captures to run security scans, validating token expirations, CORS access parameters, and checking endpoint rate limit policies.

🔒

OWASP ZAP

📡

CORS Audits

🔑

JWT Validation

🛡️

Rate Limiting

Comparison Chart

The Cost of Broken APIs

An untested API layer poses significant risks to application reliability. System regressions and performance bottlenecks often remain hidden until users encounter runtime errors. Compare the two approaches.

System Metric	Untested API Layer	JLD API QA Engineering
Data Integrity Errors	❌ High risk of data mismatch	✓ Fully validated payload structures
Security Vulnerabilities	❌ Authentication bypass risks	✓ Audited OAuth & parameter sanity
Integration Debug Time	⚠️ Days spent isolating failures	✓ Broken paths pinpointed in seconds
Deployment Confidence	❌ Afraid of microservices breaks	✓ Consumer-contract safe checks
Gateway Performance	⚠️ Connection drops under load	✓ Optimized latency baselines

API testing across industries — JLD Info Tech

Industries We Serve

Secure Connectors for Every Industry

Different sectors rely on distinct APIs. We build custom request pipelines matching the exact integration standards and payload requirements of your industry.

🏦

Banking & FinTech

Validating secure transaction APIs, double-entry ledgers, banking interfaces, and ensuring PCI-DSS payload compliance.

🛍️

Retail & E-Commerce

Testing checkout APIs, cart management systems, shipping estimators, payment gateways, and inventory hooks.

🏥

Healthcare & EHR

Validating patient record systems, HL7/FHIR interfaces, and securing health data connectors.

🚗

Automobile & Telematics

Testing real-time vehicle status logs, location telemetry streams, map data systems, and remote trigger APIs.

Business Impact

API Testing Delivers Tangible Value

Validating your system's integration points leads to faster development, lower support costs, and increased software reliability.

⏱️

70%

Faster Release Cycles

Automated integration tests run in minutes, eliminating manual validation gates and accelerating deployments.

🛡️

100%

Vulnerability Mitigation

Auditing input parameters and auth configurations prevents data exposure and secures public endpoints.

💰

60%

QA Cost Savings

Automating repetitive API regressions reduces manual testing hours and captures bugs early in pre-production.

FAQ's

Frequently Asked API Testing Questions

Find answers to common questions about API protocols, automation methods, and testing workflows.

What is API service testing?

API service testing verifies an API's functionality, performance, security, and reliability. It ensures that APIs return the correct output, handle different requests properly, and work seamlessly with multiple systems. API testing detects issues early and ensures smooth integration between applications.

What are web services in API testing?

Web services in API testing refer to software components that allow communication between applications over a network. They use protocols like SOAP or REST to exchange data. Testing web services ensures they function correctly, return expected responses, and handle errors efficiently in different scenarios.

Which tool is used to test web API services?

Popular tools for testing web API services include Postman, SoapUI, RestAssured, and JMeter. These tools help validate API functionality, check response accuracy, assess security, and measure performance under various conditions.

What are the three main types of API testing?

The three main types of API testing are functional testing, performance testing, and security testing. Functional testing checks if the API works as expected, performance testing evaluates response times and scalability, and security testing ensures data protection and prevents unauthorized access.

When should web services testing be automated?

Automate web services testing when APIs require frequent regression testing, handle large data sets, or support continuous integration. Automation is ideal for repetitive test cases, improving efficiency, accuracy, and test coverage while reducing manual effort.

Why Choose Us

The JLD Info Tech API QA Edge

We are a dedicated QA and technology solutions company. We go beyond executing basic scripts to analyze specifications, construct comprehensive regression frameworks, and help optimize payloads.

✓

Robust Automated Frameworks

We build maintainable test collections in Postman and REST Assured, ready to execute on every commit push.

✓

Deep Security & Compliance Audits

We test CORS policies, trace token behaviors, and secure public-facing gateways against unauthorized intrusions.

✓

Specification-First QA Architecture

We validate your APIs against Swagger/OpenAPI schemas, capturing contract deviations before they reach staging.

Our Tracking Record

Helping companies build secure, reliable, and high-performance microservices under any transaction load.

10M+

Daily API Requests QA'd