JSON Formatter for API Development
Format and inspect API responses in real time. Quickly identify missing fields, incorrect nesting, and data type mismatches in REST and GraphQL payloads.
API developers frequently receive minified JSON responses from REST endpoints, GraphQL servers, and webhook payloads. Formatting these responses on the fly accelerates debugging, helps verify response schemas, and makes it easier to document endpoints for team members.
Debugging API Responses
When an API returns unexpected data, the first step is always to look at the raw response. But raw JSON from production APIs is often minified and can span thousands of lines. This tool formats the response with syntax highlighting, making it trivial to spot a null value where you expected a string, or an empty array where you expected data.
Integrating with API Testing Workflows
Pair this formatter with tools like Postman, Insomnia, or cURL. Copy the response body, paste it here for a formatted view, and use the diff feature to compare responses across environments (staging vs. production) or across API versions.
Frequently Asked Questions
Yes. The tool accepts any valid JSON regardless of the source. Paste responses from REST APIs, GraphQL queries, webhooks, WebSocket messages, or even database exports.
Use the diff mode by clicking the split-screen icon. Paste the original response on the left and the updated response on the right to see additions, deletions, and changes highlighted inline.
Both JSON:API and HAL are valid JSON, so they format perfectly. The tool also recognizes top-level keys like 'data', 'included', '_links', and '_embedded' and collapses them intelligently for easier navigation.