1
JSON Formatter & Validator
Validate and beautify API responses, config files, and structured JSON payloads.
Pros
Private browser workflow
Essential for API debugging
Watch out
Not a schema validator
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Best Free Developer Tools for Startups
Startup teams need fast utilities that solve real engineering tasks without creating another paid subscription. These tools help with API debugging, authentication, data conversion, SEO metadata, and production optimization.
2
JWT Decoder & Inspector
Inspect token claims, expiration, issuer, audience, and scopes without uploading tokens.
Pros
Useful for auth debugging
Fast local inspection
Watch out
Does not replace server-side verification
3
Base64 Encoder / Decoder
Encode or decode Base64 payloads, data URIs, and transport-safe strings.
Pros
Simple data conversion
Good for API payloads
Watch out
Encoding is not encryption
4
UUID / GUID Generator
Generate RFC 4122 identifiers for databases, tests, and distributed systems.
Pros
Production-friendly IDs
No account required
Watch out
Random IDs are not sortable
5
SEO Meta Tags Generator
Generate title tags, meta descriptions, Open Graph, Twitter cards, and canonical metadata.
Pros
Useful before launch
Improves social previews
Watch out
Does not replace SEO strategy
Frequently Asked Questions
What free developer tools should a startup use first?
Start with JSON formatting, JWT decoding, Base64 conversion, UUID generation, URL encoding, HTTP status lookup, and SEO metadata generation.
Are free browser-based developer tools safe?
They are safer when processing happens locally in the browser, but teams should still avoid pasting production secrets into unknown websites.
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