ParseNest
Paste anything. Understand everything.
Detect JSON, JWT, cURL, SQL, YAML, Base64, URLs, and timestamps, open the right tool, then keep the result moving through your workflow.
DetectedJSONHigh confidence
Recent and saved tools
One paste. A complete developer workflow.
ParseNest detects the content, suggests the likely actions, and lets compatible results continue into another tool.
Focused tools that work together.
Built around the recurring steps in APIs, structured data, text work, and debugging.
JSON to Code
Generate Go structs, TypeScript interfaces, Java records, or Python dataclasses from sample JSON entirely in your browser.
Runs locallyDeveloperPipeline
Build a reusable browser-local workflow such as Base64 decode → JSON format → JSONPath extract, then run it in one click.
Runs locallyDataJSON Formatter
Format, minify, and validate JSON with useful line and column errors. Your data stays entirely in this browser.
Runs locallyDevelopercURL Converter
Convert cURL to Fetch, Axios, Node.js, Python, Go, Java, PHP, or C# code locally in your browser.
Runs locallyDataJSON Diff
Compare two JSON documents by path and find added, removed, changed, and type-mismatched values without uploading data.
Runs locallyDataYAML ↔ JSON
Convert common YAML documents to JSON and JSON back to readable YAML without uploading configuration data.
Runs locallySecurityJWT Decoder
Decode JWT headers and claims, inspect timestamps, and check expiration locally. Decoding does not verify the signature.
Runs locallyDeveloperRegex Tester
Test regular expressions with live matches, capture groups, flags, and a safe replacement preview. Everything runs in your browser.
Runs locallyEnter by the work in front of you.
Sensitive input stays in your browser by default.
Smart Paste, JSON, JWT, Base64, cURL, and text tools run in the current tab. Features that require a backend are clearly marked.
Find the fix through search, then stay for the tools.
Error fixes explain why it failed, guides teach the durable workflow, and tools verify the result.
No 'Access-Control-Allow-Origin' header is present
The browser received a response that does not authorize the requesting Origin. Inspect both OPTIONS and the actual response rather than adding a wildcard header everywhere.
Verified 2026-08-18DNSDNS_PROBE_FINISHED_NXDOMAIN
The resolver says the queried name does not exist. Confirm that the record was created in the authoritative zone and that delegation points to the expected nameservers.
Verified 2026-08-18TLScertificate has expired or is not yet valid
The certificate presented by the server is outside its validity window, or the verifying machine has an incorrect clock. Check the live certificate before replacing files blindly.
Verified 2026-08-18JWTJWT expired or exp claim validation failed
The token exp timestamp is earlier than the verifier's current time. Decode the claim, confirm seconds versus milliseconds, and obtain a new token through the intended flow.
Verified 2026-08-02