# OpenAPI Diff Breach Detector Compare OpenAPI or GraphQL schemas, flag breaking changes, and generate an impact-oriented change report for API teams > Canonical page: https://elysiatools.com/en/tools/openapi-diff-breach-detector - **Category:** Development - **Keywords:** openapi, graphql, diff, breaking changes, schema, api ## Overview The OpenAPI Diff Breach Detector is a specialized utility designed for API teams to compare OpenAPI or GraphQL schemas and instantly identify breaking changes. By analyzing the differences between your old and new schema versions, it generates an impact-oriented report that highlights removed fields, modified endpoints, and altered input contracts. This helps developers, architects, and QA teams catch potentially disruptive API updates before they reach production, ensuring seamless integration for frontend and mobile consumers. ## Inputs - **Old Schema** (textarea): Paste the previous OpenAPI YAML/JSON or GraphQL SDL here... - **New Schema** (textarea): Paste the updated OpenAPI YAML/JSON or GraphQL SDL here... - **Schema Type** (select) - **Input Format** (text) - **Include Impact Analysis** (checkbox) ## When to use - Before merging pull requests that modify API contracts to ensure no breaking changes are introduced. - When preparing a new software release to assess the impact of schema updates on existing frontend or mobile consumers. - During code reviews to quickly verify that GraphQL mutations or REST endpoint modifications remain backward compatible. ## How it works - Paste the previous version of your OpenAPI (YAML/JSON) or GraphQL SDL into the Old Schema field. - Paste the updated version into the New Schema field and select the appropriate schema type. - Enable the impact analysis option to generate a detailed breakdown of the changes. - The tool compares the two schemas and outputs a structured JSON report highlighting breaking changes, release risks, and impacted areas. ## Use cases - Preventing mobile app crashes by detecting removed response fields in REST APIs before deployment. - Alerting frontend teams when a new required field is added to a GraphQL input object. - Generating automated, structured change logs for API documentation updates between version releases. ## Frequently asked questions ### What schema formats does this tool support? It supports OpenAPI (Swagger) in YAML or JSON format, as well as GraphQL Schema Definition Language (SDL). ### What is considered a breaking change? Breaking changes include removing an existing endpoint, deleting a response field, changing a field's data type, or adding a new required input parameter that existing clients do not send. ### Can the tool automatically detect my schema type? Yes, you can set the Schema Type to 'Auto detect,' and the tool will infer whether you are comparing OpenAPI or GraphQL definitions based on the input syntax. ### What does the impact analysis include? The impact analysis evaluates the severity of changes, categorizing them as breaking, dangerous, or non-breaking, and assigns an overall release risk level to help teams prioritize fixes. ### How do I view the comparison results? The tool outputs a structured JSON report detailing the total changes, specific paths affected, and a summary of the impact for each modification. ## Related tools - [API Contract Stress Tester](https://elysiatools.com/en/tools/api-contract-stress-tester): Generate boundary-value test cases from an OpenAPI 3.x document and optionally send them to a real backend to spot contract mismatches - [Tailwind Color Palette Sync](https://elysiatools.com/en/tools/tailwind-color-palette-sync): Generate theme.extend.colors for tailwind.config.ts from HEX colors, with WCAG contrast levels and optional dark mode. - [Cron Expression Explainer](https://elysiatools.com/en/tools/cron-expression-explainer): Parse a 5-part / 6-part / Quartz cron expression into a plain-language schedule description, show the field-by-field breakdown, and list the next N execution times in any IANA timezone — with an AI-generated natural-language explanation in your language - [CSS Masonry Layout Generator](https://elysiatools.com/en/tools/css-masonry-layout-generator): Generate pure CSS masonry-style layouts with responsive breakpoints, configurable gaps, and optional full-width skip selectors - [cURL to Go (net/http) Converter](https://elysiatools.com/en/tools/curl-to-go): Convert a cURL command into a Go net/http code snippet with http.NewRequest, headers, and body - [cURL to JavaScript (axios) Converter](https://elysiatools.com/en/tools/curl-to-js-axios): Convert a cURL command into a JavaScript axios code snippet with config object, headers, and data - [cURL to JavaScript (fetch) Converter](https://elysiatools.com/en/tools/curl-to-js-fetch): Convert a cURL command into a JavaScript fetch() code snippet with headers, body, and method - [cURL to PHP (cURL) Converter](https://elysiatools.com/en/tools/curl-to-php): Convert a cURL command into a PHP cURL code snippet with curl_setopt, headers, and post fields ## Samples - [OpenAPI/Swagger Samples](https://elysiatools.com/en/samples/openapi): OpenAPI/Swagger specification examples for REST API documentation and contract definition - [OpenAPI/Swagger Samples](https://elysiatools.com/en/samples/openapi-swagger): Comprehensive API documentation examples using OpenAPI 3.0 and Swagger specifications for RESTful services - [Android Image Processing Java Samples](https://elysiatools.com/en/samples/android-image-processing-java): Android Java image processing examples including reading/saving images, scaling, and format conversion - [Android Image Processing Kotlin Samples](https://elysiatools.com/en/samples/android-image-processing-kotlin): Android Kotlin image processing examples including reading/saving images, scaling, and format conversion ## Related content - [OpenAPI Documentation, Codegen, and Contract Review Tools](https://elysiatools.com/en/hubs/openapi-utility): Compare OpenAPI code generation, API documentation, schema diffing, response validation, and contract testing tools in one hub for API design and maintenance workflows. - [API Contract Testing, Mocking, and Schema Review Tools](https://elysiatools.com/en/hubs/api-contract-testing): Generate types and docs from OpenAPI, spin up mocks, validate real responses, and review breaking schema changes in one API contract hub. - [API Versioning, Breaking Change, and Release Readiness Tools](https://elysiatools.com/en/hubs/api-versioning-breaking-change-review): Compare API versions, surface breaking schema changes, validate real response compatibility, review semver and changelogs, and prepare cleaner release handoffs in one focused hub. - [File and Data Diff & Comparison Tools](https://elysiatools.com/en/hubs/file-data-diff-comparison-tools): Compare two files, payloads, schemas, or datasets side by side and highlight what changed — across text, JSON, CSV/Excel, PDF, images, audio, databases, APIs, and configs.