33 lines
1.1 KiB
Plaintext
33 lines
1.1 KiB
Plaintext
import { decode as base64url } from './base64url.js';
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import { decoder } from '../lib/buffer_utils.js';
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import isObject from '../lib/is_object.js';
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import { JWTInvalid } from './errors.js';
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export function decodeJwt(jwt) {
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if (typeof jwt !== 'string')
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throw new JWTInvalid('JWTs must use Compact JWS serialization, JWT must be a string');
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const { 1: payload, length } = jwt.split('.');
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if (length === 5)
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throw new JWTInvalid('Only JWTs using Compact JWS serialization can be decoded');
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if (length !== 3)
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throw new JWTInvalid('Invalid JWT');
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if (!payload)
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throw new JWTInvalid('JWTs must contain a payload');
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let decoded;
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try {
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decoded = base64url(payload);
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}
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catch {
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throw new JWTInvalid('Failed to base64url decode the payload');
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}
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let result;
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try {
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result = JSON.parse(decoder.decode(decoded));
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}
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catch {
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throw new JWTInvalid('Failed to parse the decoded payload as JSON');
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}
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if (!isObject(result))
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throw new JWTInvalid('Invalid JWT Claims Set');
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return result;
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}
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