API & HTTP
API & HTTP tools are organized as request workbenches for assembling payloads, decoding protocol metadata, and checking signatures before a request or event handler hits real infrastructure.
Use this section to verify URLs, headers, signatures, and schema assumptions before you send or accept traffic.
The tools emphasize transport-level clarity for REST, GraphQL, webhook, and auth flows.
Every page shows raw inputs beside transformed output, diagnostics, and a structured mapping view.
Tools In API & HTTP
14 workbenches built for developers who need a before-and-after view, sample input guidance, browser-only processing, and copy-ready output.
cURL Generator
Build reproducible curl commands from request inputs
- Method and URL sync
- Header normalization
- Body quoting
HTTP Header Parser
Parse raw HTTP headers into structured fields
- Duplicate detection
- Auth hints
- Cache and content clues
URL Query Builder
Compose encoded query strings and full URLs safely
- Encoded preview
- Repeated-key tracking
- Base URL safety
URL Parameter Extractor
Extract query, path, and fragment details from URLs
- Origin breakdown
- Query extraction
- Fragment visibility
HTTP Status Lookup
Look up status code meaning, class, and retry guidance
- Code meaning
- Class context
- Retry guidance
JWT Inspector
Decode JWT structure and inspect claims safely
- Claim visibility
- Expiry checks
- Header metadata
API Request Builder
Assemble fetch-ready requests with headers and body checks
- Request blueprint
- Header matrix
- Snippet preview
JSON Request Validator
Validate request bodies and required payload keys
- Syntax integrity
- Required-key checks
- Path inventory
GraphQL Query Formatter
Format GraphQL documents for review and debugging
- Operation tree
- Variable inventory
- Depth review
GraphQL Query Minifier
Minify GraphQL operations for transport or embedding
- Payload reduction
- Comment stripping
- Document parity
Webhook Signature Validator
Verify webhook signatures against payload and secret
- Expected digest
- Match status
- Canonical input trace
HMAC Header Generator
Generate signed header payloads for authenticated APIs
- Canonical string
- Digest output
- Header template
User-Agent Parser
Parse browser, OS, device, and engine signals from UA strings
- Browser family
- OS guess
- Device hints
OpenAPI Endpoint Explorer
Explore paths, methods, and summaries from OpenAPI specs
- Path inventory
- Method matrix
- Summary extraction
Recommended Tools In This Topic
Start with these tools when you need a nearby request, schema, formatting, or configuration check before moving to another developer task.
API Request Builder
Assemble fetch-ready requests with headers and body checks
cURL Generator
Build reproducible curl commands from request inputs
Why API & HTTP Workbenches Matter
Transport bugs are often caused by small mismatches between the documented request and the bytes that actually leave the client. A checkout request can fail because a callback URL was encoded twice, a bearer token is expired, a GraphQL variables object is valid JSON but missing a required key, or a webhook signature was generated from formatted body text instead of raw bytes.
These tools are designed to shorten that feedback loop. Use this section as a request triage path: inspect the exact method, URL, headers, token, body, status, and client string, then move to the next nearby check before replaying traffic against a real endpoint.
- Sample flow: parse copied headers, decode JWT claims, validate the JSON body, then rebuild the request in the API Request Builder.
- Common error states: redacted or truncated tokens, stale timestamps, mixed URL encodings, missing Content-Type, and GraphQL query text separated from variables.
- Local note: browser-side helpers keep inputs on the page, but logs can still contain secrets, account IDs, emails, and internal hostnames that should be redacted before sharing.
Common Scenarios
For a 401 or 403, start with HTTP Header Parser and JWT Inspector before assuming the endpoint is broken. For a 400, validate the JSON body and check the OpenAPI endpoint shape. For webhook failures, preserve the raw body before using HMAC Header Generator or Webhook Signature Validator.
For GraphQL payloads, format the operation first so aliases, fragments, and depth are visible, then minify only after variables and headers have been reviewed. For client-specific failures, pair User-Agent Parser with surrounding request headers and status-code checks.
- Turn docs into runnable terminal commands.
- Compare encoded and decoded views of the same request surface.
- Review signatures, headers, and endpoint inventories before rollout.
- Use related JSON tools when request or response bodies need formatting, sorting, parsing, or path extraction.
API & HTTP FAQ
Stay here when you know the job category, but still need the right tool in the workflow.
That keeps debugging and transformation steps closer together instead of mixing in unrelated developer tasks.
No. The workflow is designed around browser-side input review and copy-ready output for public developer pages.
Related Developer Sections For This Workflow
These nearby sections keep API, JSON, encoding, schema, and type tasks connected without sending users into every Dev category.
Open this utility when the next check belongs in the same developer topic.
Open this utility when the next check belongs in the same developer topic.
Open this utility when the next check belongs in the same developer topic.
Open this utility when the next check belongs in the same developer topic.